Recommended Components Addendum

FM Antennae

Editor's Note: No indoor antenna can compete with a good roof or mast-mounted outdoor antenna, but because apartment dwellers often don't have a choice, we list the following indoor models that we have found to work well: AudioPrism 8500 ($499, Vol.14 No.6), AudioPrism 7500 ($299, Vol.12 No.5), Magnum Dynalab 205 FM Booster ($350, Vol.10 No.6), RadioShack amplified indoor FM antenna ($29.99, Vol.19 No.11), RadioShack 15-2163 FM antenna (Vol.27 No.7), and Fanfare FM-2G ($99, Vol.20 No.12). Outdoor antennae we have reviewed and recommended are the Antenna Performance Specialties Sniper ($595) and Antenna Performance Specialties APS-13 FM ($199), the original versions of which were reviewed in Vol.19 No.3.

Signal Processors


Rives Audio PARC analog parametric equalizer: $3200
Of this two-channel, three-band parametric equalizer with Parametric Adaptive Room Compensation (PARC), KR said, "the PARC was completely transparent in both the critical midrange and the revealing treble range," while in the lower midrange and bass, "the PARC was changing the sound, as intended." Deep male voices were "always firmer, better defined harmonically and spatially, and easier to distinguish musically." Large and complex passages of music were also improved: "I realized that, although there was no sapping of energy, there was a greatly enhanced facility to hear more of what was going on within the orchestra. PRaT (Pace, Rhythm, and Timing) fans will appreciate what PARC does to delineate the pulse and meter of the music." One of Stereophile's 2003 "Joint Accessories." (Vol.26 No.7 Review)

Spread Spectrum Technologies Trinaural processor: $1500
An all-analog box with a sub-80Hz subwoofer output and a selectable high-pass filter designed to eliminate the "cross-coupled error signals" that, while needed for two-channel reproduction, create spurious directional cues, especially when one is not sitting rigidly in the central sweet spot. With the SST in his system, KR felt less constrained to sit in his "serious listening position." Overall, the Trinaural was "consistently satisfying with a wide variety of two-channel music" and offered a "subjective improvement in the bass." KR: "The Trinaural processor significantly improved most recordings while enhancing the spatial presentation, and had no real deficiencies." (Vol.27 No.9 Review)

Z-Systems rdp-1 reference: $4000
A digital preamp, but, as KR points out, "a flexible and friendly parametric equalizer" as well. "The best way to correct tonal imbalance in speakers and source material. The tone control for the digital age." However, he cautioned, it is not a universal Band-Aid. "While the rdp-1 can modify the amplitude response of [a] speaker, it cannot correct phase interactions between drivers, nor can it change the radiation pattern of [a] speaker." But used judiciously, "it is a valuable tool." After making it his 1998 "Editor's Choice," JA bought one of the review samples and uses it to apply judicious EQ when he masters Stereophile recordings. (Vol.21 No.7 Review)


Automated Controlled Environments Subwoofer Optimization System: $269
This single-band, self-calibrating parametric EQ operates between 20 and 80Hz with adjustable gain and Q, and works with any powered subwoofer that lacks an active crossover. Installation and setup were quite simple, and improvements in overall sound were obvious. KR's subwoofer completely "disappeared," and his entire system became tighter, more solid, and more powerful, with no addition of mid- to low bass in the sub's vicinity. Full-range speakers, however, will still energize the low-frequency room modes. (Vol.28 No.1 Review)

Miscellaneous Accessories

Audio Research Tube Damping Rings: $3.95 each
Damping rings for all AR products are now available to the public at large. They're made of a proprietary polymer material that converts kinetic energy to heat, and their improvements are not subtle, exclaims BJR: tighter, cleaner, deeper, more dynamic bass; more coherent transient attacks; crisper, more extended highs; plus "improvements in the reproduction of subtle gradations of low-level dynamics." Give 'em a whirl—the cost is minimal. (Vol.23 No.2, Vol.26 No.8)

AudioPrism Noise Sniffer RFI/EMI detector: $199.95
An "electronic detective in the campaign to eliminate noise," said Chief Willis. "Simply plug it in and turn up the volume—its small built-in loudspeaker will reveal where your problem outlets are." Then you can turn to AudioPrism's QuietLine Parallel AC line filter for a cure. "A must-own product, period," says BD. "10-4," adds J-10. (Vol.21 No.12)

AudioQuest binding-post wrench: $10.00
A great idea improved—similar to the original Postman, but with a metal sleeve reinforcing the sockets. (Vol.20 No.9)

Caig ProGold Wipes: $19.95/50ct
For cleaning electrical connections, available from JM: "A small but powerful stocking-stuffer.... You'll feel like a pro!" (Vol.25 No.12 Review)

Eichmann Bullet Plugs: $40 in copper (set of 4), $99 in silver (set of 4)
RCA connector using a clever design in which the hot signal is conducted by a hollow rather than a solid pin, and where a smaller, solid pin at the connector's periphery takes the place of an unnecessarily massive ground sleeve. AD heard "a more open and explicit sound" with a "deeper, more open, and more inviting" soundfield. Silver Bullet Plugs made the difference "clearer, more explicit, and even smoother." (Vol.27 No.12 Review)

Mondial MAGIC video ground isolator: $99
Provides effective antenna and cable-feed isolation for those whose video systems have hum problems. A splitter version is available for $149. (Vol.15 No.2, Vol.24 No.6)

Shakti electromagnetic stabilizer: $230
Passive component containing passive circuits intended to absorb and dissipate the EMF generated by active audio gear. J-10 and WP found them effective to varying degrees, depending on the components they were used with. J-10 discovered that "focus, transparency, clarity, and speed were better, as was the sense of pace." RD found that the Sonic Frontiers SFD-2 Mk.II sounded better—less upper-midrange grain—with the Shakti placed on the chassis above the transformer. WP uses them on his power amps, but cautions that using too many in a system will close it down and make it sound dull. (Vol.19 Nos.2 & 4; see also "Industry Update" in Vol.21 No.4)

Sound Alignment Systems by Checkpoint P770 laser alignment tool: $210
"The ideal device for positioning speakers," RD said energetically, agreeing with LB that it should be "in the tool chest of every audiophile who wants to get the best sound from loudspeakers." It's easy to use—just turn it on, hold it against the speaker's front panel, then adjust the speaker's position until the "appropriate toe-in and vertical orientation are obtained"—and is much more effective than "eyeballing the speaker from the listening position." (Vol.21 Nos.1 & 11, Vol.24 No.8 Review)

Stabilant 22 contact enhancer: $55/5ml bottle, with 5ml concentrate, 15ml mixing bottle, applicator, microbrush
Used to increase the reliability of contacts, available from JM: "An initially nonconductive complex block polymer liquid that, under the influence of electricity, becomes conductive. Furthermore, it does not cross-link to form sludge. Pretty nifty!" (Vol.25 No.12 Review)

Townshend Audio Maximum Super Tweeter: $1500/pair
This ribbon driver, built into a small stainless-steel case, operates in parallel with a full-range loudspeaker to extend the frequency response to a claimed 100kHz. When he used the Townshends with his original Quad speakers, AD found the Super Tweeters "contributed a near-perfect dose of texture, color, and spatial believability," the greatest improvement being in the reproduction of singing voices. Improvements were not quite as dramatic with newer Quads. Home auditioning with "other insufficiently tweety" loudspeakers is recommended. (Vol.27 No.11 Review)

WBT 0101 RCA plugs: $134/4 or $32 each
The best, although the original steel locking collett, now replaced by brass, gave rise to neurosis. WBT 0144 RCA plugs cost $80/4. Distributed in the US by Kimber Kable. Both now include a complete set of strain-relief ferrules and a length of WBT 4% silver solder, hence the price change. (NR, but see "Industry Update," Vol.12 No.9.)


Audiodharma Cable Cooker v.2.5 and Thor Audio The Phono-Burn not tried in too long a while.

Stands, Spikes, Feet, & Racks

Good Speaker Stands There are too many possibilities, but, briefly, a good stand has the following characteristics: good rigidity; spikes on which to rest the speaker, or some secure clamping mechanism; the availability of spikes at the base for use on wooden floors; if the stand is steel, provision to keep speaker cables away from the stand to avoid magnetic interaction; and the correct height when combined with your particular speakers (correct height can be anything from what you like best to the manufacturer's design height for best drive-unit integration). Though Stereophile hasn't reviewed speaker stands, it's not because we think they're unimportant—for speakers that need stands, every dollar spent on good stands is worth $5 when it comes to sound quality. Brands we have found to offer excellent performance are Arcici Rigid Riser, Merrill (see Vol.18 No.1, p.39), Sound Anchor, Sanus Systems Steel and Reference, and Linn. (Sound Anchor also makes an excellent turntable stand, reports TJN.) Interface material between the speaker and the stand top plate is critical: Inexpensive Blu-Tack seems to reduce the amplitude of cabinet resonances the most (see Vol.15 No.9, p.162).

Audio Points by Star Sound Technologies: $49.99–$99.99/set of 3
Highly polished point of solid milled brass, claimed to have been developed along the theories of Coulomb Friction, transfer resonant energy through the virtual point away from the component. 28 sizes and thread combinations available. (NR)

Audio Selection Cones (formerly German Acoustics): $11 each
These effective brass-colored steel cones have removable hardened tips. (NR, but see Vol.15 No.9, p.162.)

AudioPrism Iso-Bearings: Small (2.5mm), $59.95/3; Large (3.3mm), $89.95/3
Squishy, nonreactive polymer balls with plastic cups are recommended by CG for effective acoustic isolation. (NR, but see Vol.15 No.9, p.162.)

AudioQuest SorboGel Q-Feet: $89/4
Now in a more reactive formulation in bright blue, these feet are the best means of isolating components from vibration. (NR)

Aurios MIB component supports: $299/3
RD highly recommends these footers. Of the latest 1.2 version, he writes, "Do everything the originals did, but leveling is much less critical." (Vol.24 No.5)

Black Diamond Racing Pyramid Cones: $20 each
"Expensive, but very effective," according to J-10. WP and JA, who generally use these whenever they need to support electronic components, agree. (Vol.21 No.6)

Black Diamond Racing The Shelf: $440–$875
Heavy, costly, but extremely free from torsional flex, this loaded carbon-fiber isolation platform impressed WP with a "marked increase in perceived silence" when placed under equipment. He also noted that low-level musical information became more prominent with the support in his system. J-10: "Transparency was greatly enhanced, coupled to a greater sense of air and original acoustic." WP maintains that when he "wants to really hear what a component is doing—as free as possible from the effects of its environment—it ends up on The Shelf." (Vol.19 No.2, Vol.21 No.6 Review)

Boltz CD 600 storage rack: $249; expansion kits, $169
Boltz LP shelves: $529 for a three-shelf unit; each additional shelf: $149

Surfing the Net (, MF found these do-it-yourself racks: each is 48" high, 24" wide, just 6" deep, and holds 600 CDs! You can double or triple the capacity with the expansion kits, and the racks are now available pre-assembled. Now available as equipment racks, TV stands, and LP shelves. MF bought the LP rack, which consists of a heavy base and three shelves; additional shelves (3' wide by 10" deep) run $149 each, and you can stack 'em to the ceiling! "Really well-made and incredibly sturdy," reported The Analog One. Free shipping. (Vol.22 No.11, Vol.24 No.1)

Bright Star Air Mass 3: $179
Ingenious, inexpensive, and effective air-bladder product that damps out floor and air-borne vibrations, MF said. WP agrees. Originally called Air Mass 1. (Vol.20 No.2)

Bright Star Audio Rack of Gibraltar 1 equipment stand: $1999
Bright Star Audio Big Rock 1: $299
Bright Star Audio Little Rock 1 Isolation Pod: $165
Bright Star Mini-Rock F VPI isolation base: $199

A very effective isolation system for control of unwanted vibrational energy. Individual components float on a sand bed for energy dissipation, and are weighted down with the Little Rock to minimize spurious vibrations. The payoff is enhanced resolution of the music's nuances, says DO. RN adds that this system consistently tightens the bass, increases sonic transparency, and smooths treble hash and grain. The Bright Star TNT Big Rock is a $275 sand table specially sized to support the TNT. WP, MF, BD, and BJR all use one under their VPIs, as they provide a stable surface and offer such sonic benefits as a lower noise floor and increased bass. The Mini-Rock F is specially sized for use under the TNT's flywheel. (Vol.16 No.5; Vol.18 No.11, Mini-Rock F; Vol.20 No.4, TNT Big Rock.)

Bright Star Rack of Gibraltar 2 equipment stand: $2450
Rigid, super-stable platform for audio equipment, and the "carrier" for the Ultimate Isolation System: air-base (Air Mass) and sand-filled damping platform (Big Rock) makes a "sandwich" of sorts. The Gibraltar 2, with its two-wide, three-high, widely spaced, large shelves, isn't quite ready for MoMA and boasts no neon lights, but "in its simplicity and quality it's attractive, even elegant," said BD. He recalled Louis Henri Sullivan, who immortalized the phrase "form ever follows function." Suitable for turntables, superbly built, and the best BD has ever used. (Vol.23 No.5 Review)

Bright Star Ultimate TNT Isolation System: $1343
Simple, affordable, effective isolation system for the VPI TNT that combines a static pneumatic isolation mount with mass loading. WP noted that "high frequencies seemed clearer, less smeared—harmonics leapt off strings and floated independent of the fundamental...Bass sounded more deep and taut, especially sustained notes or anything in the bottom two octaves of the piano." BD agrees, finding that the Isolation System lowers the TNT's (already low) background noise, resulting in subtle but noticeable improvements in image dimensionality, ambience, and inner detail. (Vol.20 No.7)

Gingko Audio Cloud 11 isolation stand: $419
The Cloud 11 uses up to ten rubber-like balls strategically placed between two slabs of acrylic. Mikey's sample was configured for use with the VPI Scoutmaster turntable. MF: "Putting the Cloud under the Scoutmaster resulted in a dramatic lowering of the noise floor and an improvement in the 'blackness' of the background. Images stood out in clarified relief, bass tightened, transients sounded sharper and more natural. The differences were not at all subtle." (Vol.27 No.11)

Golden Sound DH Cones, Squares, and Pads
With the Cones alone, J-10 "noted a lift in overall transparency, with a slightly tighter focus." Using the Squares alone, "the sound was softer than the Cone/Square combo...but nevertheless got high marks for a sweet and pleasant presentation." And in combination? "The highs and upper midrange were beautiful and open, the midrange had just the right amount of juice, the lower midrange wasn't boomy at all, and the bass extension was excellent." ST is also a fan, particularly of the Pads, which "wrought quite an improvement in sound under my Cary SE300Bs." Super Cones, $100/set of 3; Jumbo Cones, $70/set of 3; Large, $50/set of 3; Medium, $40/set of 3; Small, $20/set of 3. Squares, $30/set of 3, $40 set of 4; Super Pads, $250 (19" by 17" by ½" thick); Golden Sound Pads, $150 (12½" by 17½ by ½" thick); Acoustic Discs, $120/set of 12. (Vol.20 Nos.11 & 12, Vol.24 No.5)

Grand Prix Audio Monaco equipment stands: $1250–$5111
Despite their stylish, lightweight design, a four-shelf Monaco stand can carry up to 150 lbs per shelf, for a maximum total load of 500 lbs. PB: "More than anything else, the Monaco brought a sense of focus and a difficult-to-explain sense of calm" to the sound of everything he placed on them. Loading the hollow stainless-steel columns with lead shot produced another increment of improvement: "Backgrounds became quieter, low-level detail retrieval improved markedly, and dynamic contrasts took on greater subtlety and sharper contrasts." Using separate isolation footers under components only "muddled things," providing evidence of the "fundamental soundness of the GPA approach to vibration control." The amp stand is expensive but "works as promised and looks cool too," decided MF. A 3-shelf system costs $2856; 4-shelf system, $3999; 5-shelf system, $5111; base module, $1855; short or tall module, $1235; amplifier stand, $1250; Formula Shelf Carbon-fiber/Kevlar composite shelf, $900. (Vol.24 No.7, amp stand; Vol.25 No.12 Review)

Music Direct record rack: $299–$450; add $100–$150 for additional shelves
Sturdy, attractive racks with modular shelves of 3/4" MDF in lengths of 31" and 59". Steel backsplashes keep records lined up evenly, while a series of hidden support rods make sure they never fall over or bend, even when the rack is only partially filled. Available in maple with silver uprights or cherry with black uprights. Add $100 for each additional shelf. MF: "Designed by vinyl enthusiasts for vinyl enthusiasts." (Vol.27 No.6)

S.A.P. Audio Relaxa magnetic levitation platform: $795
Uses pairs of opposing magnets in each of four feet that are stabilized using a bearing/shaft mechanism designed to minimize mechanical contact. MF: "The Thorens 850's sonic charms only improved with the better isolation provided by the Relaxa. Image focus, and the subtlety and clarity of musical transients, seemed to be rendered more cleanly." Compared to the Gingko Audio Cloud 11, the Relaxa demonstrated less effective attenuation overall, but did a much better job of dispensing with motor noise. (Vol.27 Nos.2 & 11)

Sound Anchors Cone Coasters: $14 each
These discs, machined from a sandwich of stainless steel, Kevlar, and polyester, are designed to prevent speaker spikes from ruining your floors and to prevent vibrations from being transmitted through wooden floors. BJR found that using them with his Al;aon Vs resulted in greater perceived detail and "faster" bass. (NR)

Symposium Energy Absorption Platform: $499 Symposium Ultra Isolation Platform: $599
The top and bottom of the Ultra platform are aluminum, while the middle is made up of several unequal-thickness layers of vibration-damping material designed primarily to drain vibrational energy away from your component, rather than to provide isolation from external vibrations or footfalls. It succeeded at lowering noise and enhancing resolution, while bringing "an entirely subjective sense of ease" to listening, said JM. The less-expensive platform jazzed MF with the "top-to-bottom authority, focus, and slam" that his system gained when the platform was installed under his turntable. Prices are for 19" by 14" size; 19" by 21" costs slightly more. (Vol.20 No.5. Vol.26 No.3 Review)

Symposium Rollerblock Series 2+: $399/set of 3, $499/set of 4
For improved resolution from your CD player (or any other digital equipment), ST recommended these precision-machined items, which consist of a block with a ball bearing set in a hemispherical depression. Once they're in place, he said, the sound "just tightens up, cleans up, clears up. I hear more low-level information. Imaging improves. Timing, too...Transients are crisper. I hear improvement in just about every respect." The only drawback (outside of cost) is that the player might "roll around a little" when you load a disc or hit Play. SD concurs with ST's enthusiasm; MF became a believer in the "high-roller" phenomenon when he put his Virgos on the similar Yamamura speaker bearings. (Vol.22 No.4)

Vibrapods: $6 each; available singly or in packs of 4
KR: "Placed under CD players/transports, DACs and preamps, the small (1"x3" diameter), formed Vibrapods isolate and enhance performance. Five different models rated for loads of 2–28 lbs; match the quantity to the component. I keep a box of them around so that no component goes without." A KR favorite. (NR)

Walker Valid Points: $325/set of 3 large cones and 5 discs; other sizes available
Heavy brass-alloy-and-lead cones, with points that rest atop large, brass-ringed, lead-filled "tuning discs." "Definitely worth checking out," said MF, "and Walker will refund your money if you're not satisfied. (You must return the set within 30 days in the original condition.)" MF adds that "not only do I like them a lot, they're well worth the price—as I clearly found when I put a set under the Ayre K-1 and added a few of the discs on top." Combined height may be too tall for some racks. Super Tuning Kit ($425) includes three large cones, five discs, and four 1" discs. (Vol.20 No.5, Vol.21 No.11)

Zoethecus audio stands: $569–$1900, e.Shelves, $34 each; z.Pods, $140 each; z.Slabs, $200 each
Attractive frames carry e.Shelves (aluminum-topped, medium-density fiberboard), z.Pods (nine-layer, constrained-layer-damped), and/or solid z.Slabs, which rest on phenolic corner crossbraces dotted with Isodiscs to "isolate the shelves from floor- and airborne vibration." e.Shelves are best for mechanical devices like turntables and transports, z.Pods for electronic ones. According to MF, "the isolation part works extremely well...the energy-draining shelves seem to work as well," though he now says they "can impart a slightly 'squooshy' sound to some components." (Vol.22 No.7)


Bright Star IsoNodes, Finite Elemente Reference Pagoda equipment stand, String Suspension Concepts and Finite Elemente Cera-ball feet.


Lovan Classic II Modular Racks discontinued.

Digital Data Interconnects

Apogee Electronics Wyde-Eye: $49.95/0.5m; $59.95/1m; $69.95/2m; $79.95/3m; $89.95/5m; $99.95/10m $$$
"If you haven't heard this 110 ohm balanced data cable, you're missing out!" crows LL, adding that it's "more transparent, more musically honest than any I've heard—and it's ridiculously cheap!" JA is also impressed, and uses 50' lengths for his Stereophile recording sessions. KR, however, while agreeing that Wyde-Eye is an excellent value, notes that it is less transparent-sounding than the (much more expensive) Illuminations. Also available for the same price in a 75 ohm version for S/PDIF applications, using Canare's true 75 ohm RCAs. (NR)

AudioQuest OptiLink Pro 2: $350/1m, with AT&T-ST termination
Expensive ST datalink that JA and JE recommend highly. Excellent bass performance, with power, clarity, and dynamic contrast, says JE. Rich sound. ST terminations can be fragile, adds JA. (Vol.16 No.11)

Canare DigiFlex Gold model RCAPOO3F: approx. $10.70/3ft
Before you try any of the expensive coaxial links, CG advises trying this inexpensive, true 75 ohm cable with Canare crimp RCA connectors. He rates it as his first choice in a digital cable at any price, even preferring it to the Kimber AGDL. JA uses the 110-ohm version in various lengths for CD mastering. (Vol.16 No.7)

Kimber Orchid: $580/1m
Expensive, but the best AES/EBU link JA has used. J-10 loved the Orchid's midrange liquidity and detail, but preferred Illumination's S/PDIF cable overall. SD (almost) doesn't equivocate: "Probably the best out there for now....A stunner!" RH and RD are also fans. New lower price usefully brings this cable in reach of more music lovers. (Vol.19 No.5)

Stereovox hdvx: $100/1m
"Chris Sommovigo does it again with another and better and cheaper digital coax!" cries KR. This BNC-BNC S/PDIF cable comes with RCA adapters and is sturdy enough for a reviewer's constant reconnecting and neutral enough to reveal the subtleties of the connected equipment. "$100? I cannot imagine spending more!" decides Dr. Kal. JA agrees. (NR)


AudioQuest Optilink-5, Audience Au24, DH Labs Silver Sonic D-110.

Books & Computer Software

David Moulton's Playback Platinum Test CDs: $44.95 each if purchased separately, $159.80 for the set of 4
Four-volume lecture series that covers the fundamentals of audio from a popular-music production standpoint: Vol.1, Loudness, Compression, Distortion; Vol.2, Stereo Miking; Vol.3, Equalization; Vol.4, Digital Audio: Sensory Listening Tests. Each volume is on a separate CD, which comes in a hardbound, textbook-sized book that includes about 50 pages of additional text keyed to each track of each lecture. JM: "I'm impressed with how Moulton & Co. take material that has the potential to be dauntingly dry, and make it enjoyable and memorable by adopting at times a 'radio drama' approach." (Vol.26 No.5 Review)

Digital Recordings Audio-CD Hearing Test: $39.95
This system permits useful evaluation of hearing thresholds with only a CD player and a pair of headphones. KR reported that it reveals any significant gaps in your hearing. (His own results were "close to ideal, especially considering my age and usual haunts." Whew.) "Ever wonder why others don't hear what you do? This simple test will tell you, even though you may not like the answer." Such a card. (Vol.23 No.1)

ELAC Technische Software CARA REL 2.1 Plus program: $74.95
To use CARA, one must create a full three-dimensional model of the listening room, using the program's CARACAD module. KR: "By 'full,' I mean that all room dimensions and surfaces are defined: doors, windows, furniture, soffits, bays, etc." Kal found it time-effective to reduce the complexity of the model (eg, remove smaller objects) and the order of reflections (3–4) for the early iterations, at which point the number of possible speaker and user positions is large—an 800MHz Pentium III can take 48 hours or more to run even that modest a set of variables. "Several simplified runs will tell you which arrangements deserve more investigation. After that, you can limit the range of positions for speakers and listener while progressively increasing the number of reflections and adding more feature details, as a confirmation of the optimum arrangement." Checking predictions against the results with ETF or with TacT RCS measurements confirmed CARA's conclusions to an amazing degree. KR: "Wouldn't you like to know how well a speaker might work in your room before you buy it? I would." Runs under Windows. Web: (Vol.24 No.9 Review)

ETF 5.x room response software: $149
KR says, "This Windows 95 program is the most cost-effective and critical way to assess your room and system acoustics and monitor your adjustments to them. Unlike modeling programs, ETF actually measures room responses and modes, and is an essential tool for users of equalization and correction systems." J-10 and SD agree. Compared with Acoustisoft's ETF 4.0 software, which was reviewed by KR, ETF 5.0 contains a revamped interface, a full MLS-based signal generator/analyzer with both post-process and pseudo-real-time capabilities. Very easy to use and requires only a decent duplex soundcard and microphone. (Vol.21 No.7 Review)

RPG Diffusor Systems Room Optimizer Software: $99
MF recently moved to a new home with bare, reflective walls—where to plunk the speakers? RPG Diffusor Systems' Room Optimizer Software—available from, among others, Audio Advisor—to the rescue. Plug in the room's dimensions (they must be rectangular) and the program will output the location where the modal response is flattest and the speaker-boundary interference is minimized. It'll also tell you where to sit! (Vol.22 No.11)

Visual Ears: $89, plus $3 S&H
Inexpensive but excellent computer program for PCs and Macs. Available from KB Acoustics, P.O. Box 50206, Eugene, OR 97405. Tel: (541) 935-7022. Allows an audiophile to move simulated loudspeakers and a simulated listening seat around a simulation of his or her room (in three dimensions) to find the position that gives optimal performance below 200Hz or so. (Vol.13 No.12, DOS; see "Industry Update" in Vol.19 No.4 and "Fine Tunes" in Vol.21 No.8, Windows.)


SignalScope and SignalSuite for Mac OSX, TrueAudio spectrum analyzer for Windows.