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Topping Pre90 line preamplifier Measurements

Sidebar 3: Measurements

I measured the Topping Pre90's performance with my Audio Precision SYS2722 system (see the January 2008 As We See It), repeating some tests with the magazine's higher-performance APx555 system.

The Pre90's volume control operated in accurate 0.5dB steps. The maximum gain at the unbalanced outputs was the specified 10dB for both the balanced and unbalanced inputs; the maximum gain at the balanced outputs was the specified 16dB for both types of inputs. The preamplifier preserved absolute polarity (ie, was noninverting) with both balanced and unbalanced…

Gramophone Dreams #57: Ferrum OOR headphone amplifier and HYPSOS power supply

I'm deep into audio power amplifiers because they remind me of race car engines. Both power sources are wildly inefficient, converting only a small percentage of their stored energy into work while dissipating the rest as heat and vibration. Mainly though, I love how race car engines sound. How they shake the air. Just like amps and speakers.

Audio-frequency power amplifiers take a small input signal—usually less than 1V—apply it to an input impedance of (typically) no less than 10k ohms, and make this tiny eye-blink of power (0.0001W) into a waveform that's many times more powerful,…

Gramophone Dreams #57: Ferrum OOR headphone amplifier and HYPSOS power supply Page 2

According to Matuszak, output power into 32 ohms is about approximately 9.5Wpc balanced. It's around 8.3W into 50 ohms and 2W into 300 ohms, both balanced (footnote 2).

On the left of the OOR's front panel is a four-pin XLR headphone output; to its right is a ¼" (6.3mm) output jack followed by a flat knob switch for choosing the RCA or XLR input; that's followed by another knob switch for choosing –4dB, +6dB, or +16dB of balanced gain or, in single-ended mode, –10dB, 0dB, or 10dB of gain. With the Susvara and Abyss headphones, I used balanced at +16dB.

Listening to OOR
I…

Fyne Audio F500SP loudspeaker

In my April 2020 review of Fyne Audio's inexpensive F301 standmount loudspeakers, I wrote, "The Fyne F301s impressed with their exceptional rendering of soundstage width and depth, reasonably wide dynamic range, extended low end (for their size), and exuberant, I-can't-stop-spinning-records presentation. The Fynes presented a finely layered, spatially convincing soundstage with images that were solid, if small."

Upon receiving Editor Jim Austin's assignment to review the Fyne F301's big brother, the F500SP, an upgraded version of the company's F500 model, I wondered if listening would…

Fyne Audio F500SP loudspeaker Page 2

The F500SPs were texture kings. They captured the sound of a wire brush circling a plastic drumhead; of air rushing through a metal saxophone; of the resounding rasp of a vibraslap; of the bristling character that distinguishes a Fender Telecaster from a Stratocaster.

Parasound's Hint 6 Halo extracted clarity from the F500SP, but the combination produced glare that left my ears ringing. The Hungarian Heed Audio Elixir proved a warmer and more liquid match, fleshing out the speaker's low end and producing a more balanced tonal palette. The Schiit Audio Ragnarok 2 made the best match yet…

Fyne Audio F500SP loudspeaker Specifications

Sidebar 1: Specifications

Description: Two-way, bass-reflex loudspeaker with coaxial tweeter/midbass driver and down-firing port with diffuser. Drive-unit complement: 6" (150mm) "IsoFlare" point-source driver with multifiber bass/midrange cone with "FyneFlute" surround, 1" (25mm) magnesium-dome compression tweeter with neodymium magnet system. Crossover frequency: 1.7kHz. Crossover type: Biwired, passive, low-loss, 2nd-order low-pass, 1st-order high-pass. Frequency response (–6dB in a typical room): 42Hz–34kHz. Sensitivity: 90dB/2.83V/m. Nominal impedance: 8 ohms. Recommended amplifier…

Fyne Audio F500SP loudspeaker Associated Equipment

Sidebar 2: Associated Equipment

Analog sources: Kuzma Stabi R turntable/4Point tonearm, EMT TSD 15 N Super Fineline moving coil phono cartridge.
Preamplification: Tavish Audio Design Adagio phono.
Integrated amplifiers: Ayre EX-8 2.0, Heed Audio Elixir, Parasound Hint 6 Halo, Audio Ragnarok 2.
Power amplifiers: LKV Research Veros PWR+.
Loudspeakers: GoldenEar BRX, Polk Audio Legend L100.
Cables: Interconnect: Two-meter Triode Wire Labs Spirit II. Speaker: 8' pair Auditorium 23. AC: Triode Wire Labs Obsession NCF, manufacturers' own.
Accessories: One pair 24" Sanus…

Fyne Audio F500SP loudspeaker Measurements

Sidebar 3: Measurements

I used DRA Labs' MLSSA system, an Earthworks microphone preamplifier, and a calibrated DPA 4006 microphone to measure the Fyne Audio F500SP's farfield behavior, and an Earthworks QTC-40 mike for its nearfield responses. I left off the grille for the measurements. I used Dayton Audio's DATS V2 system to measure the impedance magnitude and electrical phase angle.

Fyne Audio specifies the F500SP's sensitivity as a high 90dB/2.83/m. My estimate was 87dB(B)/2.83V/m. The F500SP's impedance is specified as 8 ohms; I found that the impedance magnitude (fig.1,…

Revinylization #26: Two Charles Mingus LPs

In the annals of jazz, Charles Mingus—bassist, pianist, composer, bandleader, unique, headstrong, and deeply influential in every category—occupies the transit point between Duke Ellington and the post-'60s avant-garde, a station he carved out deliberately. He venerated Ellington—his sophisticated rhythms and tonal colors, but also his attention to melody, harmony, and structure—and went beyond him (careened down a different path) in expressing emotion, chaos, and anger; it's these elements that the avant-gardists took from him, while abandoning (to a degree that intrigued but also…

ReDiscoveries #2: Joe Henderson, Blue Note and Beyond

Called "the phantom" by fellow musicians and dubbed the "bearded, goateed astronaut of the tenor sax" by a close friend, trumpeter Kenny Dorham, the enigmatic Joe Henderson recorded five albums for the Blue Note label that are uniformly regarded as jazz classics. Mosaic Records has gathered those records—Page One, Our Thing, In 'n Out, Inner Urge, Mode for Joe—plus Henderson's sideman dates and alternate takes for Blue Note for a limited-edition, five-CD box set, The Complete Joe Henderson Blue Note Studio Sessions (Mosaic Records MD5-271).

Henderson's music on Blue Note is cerebral but…