Description: Solid-state stereo preamplifier. Phono inputs: MM & MC. High-level inputs: 5. Separate tape control. Ability for 1 external loop. Frequency response: 10Hz–20kHz ±0.1dB. RIAA accuracy: 0.1dB or better. Input impedance: adjustable (100k ohms standard) (phono), 10k ohms (high-level). Input capacitance (phono): 150pF. Input overload: 160mV (MM), 10mV (MC), 2V (line). Distortion 0.01% or better. Maximum output voltage: 18V rms. Output impedance 50 ohms in active, variable in straight wire with maximum of 10k at lowest volume. S/N ratio MM: 82dB A-…
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Sumo is one of a handful of American audio manufacturers dedicated to producing moderately priced products aiming for high-end sound; their most expensive product is the Nine Plus, at $1199 (although a more expensive Andromeda II is imminent). When I heard I was scheduled to review the Sumo Athena, I looked forward to the opportunity. A Sumo Nine (not a Nine Plus, which I haven't auditioned) had been my front-line power amplifier a few years ago. It was an excellent budget amplifier whose only serious shortcoming was its limited 60Wpc power output.
The Athena is, at present, Sumo's only…
Sidebar 1: TJN's System
Associated equipment used in auditioning the Athena included the Well-Tempered Arm on a VPI turntable, Grado MCX and Dynavector 17D pickups (a vintage, but little-used sample, this particular pickup chosen primarily for its very flat high end and otherwise good overall performance in the Well-Tempered Arm), PS Audio 200Cx and Sumo Polaris amplifiers (and, briefly, the Motif MS100), Epos ES 14 (primarily) and VMPS Tower II/R (briefly—to fill in for the low-end limits of the Epos) loudspeakers, and Monster M-1 loudspeaker cables and M-1000 interconnects.
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Sidebar 2: Specifications
Description: Solid-state stereo preamplifier. Frequency response: 20Hz–20kHz ±0.1dB, 1.5Hz–500kHz ±1.5dB. RIAA accuracy: 20Hz–20kHz ±0.25dB. Input impedance: 47k ohms (standard phono), 100 ohms (moving-coil; adjustable with plug-in resistors). Input capacitance (phono): 100pF. Input overload: 165mV (MM), 8mV (MC), unlimited (high-level). THD: 0.005%. S/N ratio: 85dB (MC), 80dB (MM), 100dB (line). Maximum output: 20V RMS.
Dimensions: 19" W by 1.75" H by 8.75" D. Weight: 8 lbs (estimated).
Price: $649 (1988); no longer available (2014). Approximate number…
I wish I could be enthusiastic about the Acoustat Spectra 11—an electrostatic/dynamic hybrid selling for $999/pair. At first glance, the Acoustat Spectra 11 looks like a good deal. They could almost be called knock-offs of the Martin-Logan Sequels—they're about the same size. As with the Sequels, there are moving-coil bass cabinets below, electrostatic panels on top. The Spectra 11 cannot be bi-wired and does not come with spikes. Tiptoes are recommended, and I used them. I let the speakers run in for about 24 hours before doing any serious listening.
First, the good points. The Spectra…
John Atkinson Listens
I did some brief but serious listening to the Spectra 11s before this issue went to press, and have the following comments to make. The range covered by the woofer (35–200Hz) measures and sounds between 3dB and 5dB too high in my room, which is about the same size as Sam's. This disparity will be less pronounced in larger rooms, and is most likely due to the fact that the woofer radiation is effectively omnidirectional while the electrostatic panel has a bipolar, figure-eight dispersion pattern. The in-room sound of the Spectra 11s is certainly rolled-off in the…
Thomas J. Norton reviewed the Spectra 11 in February 1990 (Vol.13 No.2):
Drat! There's just no way to do it. To let you, the readers, know all about one of the better loudspeaker deals around, without letting Acoustat (and their dealers) in on the secret. JA is bound to spill the beans just by sending the traditional prepublication draft to the manufacturer. Then Acoustat will send dealers copies, and before you know it, Bingo! Instant pressure to increase the price. Let's see now, if JA just misplaces Acoustat's zip code, then we print the published review in two-week disappearing ink…
Sidebar 1: System & Set-Up
Associated equipment used for the review included the SOTA Cosmos turntable, SME V pickup arm, Krell KC-100 cartridge, CAL Aria CD player, Klyne SK-5A preamp, Forté 1a, Classé DR-9, and Mark Levinson No.23 power amps, Monster M-1000 interconnects, and Monster M-1 and AudioQuest Green Hyperlitz speaker cables. Approximately 75% of the program material used was analog LP, the remainder CD.
Acoustat recommends that the Spectras be broken in before serious use. Accordingly, I connected them up to the video system in my den/video room for several weeks…
Sidebar 2: Measurements
Fig.1 shows the spatially averaged response of the Spectra 11s in my listening room. The overall balance can be seen to be rolled-off in the highs, with an excess of 4–5dB in the exact region covered by the woofer (35–300Hz). The apparently depressed HF, however, owes more to the limited dispersion of the Spectra 11's electrostatic panel in its top two octaves in both lateral and vertical planes. The on-axis response measures and sounds both flat and smooth to about 14kHz, with the exception of a degree of boost between 2kHz and 2.5kHz, though there is still a lack…
Sidebar 3: Specifications
Description: Three-way loudspeaker with 8" sealed-cabinet, dynamic woofer and electrostatic midrange/tweeter. Crossover frequencies: 250Hz and 2500Hz (see text). Frequency response: 45Hz–20kHz ±3dB. Minimum recommended power: 75W. Impedance: 8 ohms nominal, 3 ohms minimum. Sensitivity: not specified, but stated to be a minimum of 3dB more efficient than full-range Spectras.
Dimensions: 72" H by 15" W by 14" D. Weight: unspecified, but estimated 60–70 lbs each.
Price: $999/pair (1990); no longer available (2014). Approximate number of dealers: 125.
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