Re-imagining "Class A" Amplification

christoph

Well-Known Member
Dec 12, 2015
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Principality of Liechtenstein
GT Audio Works, speakers, Westminster Labs REI amplification, LampizatOr Horizon source and Pass Lab's big 3 box pre.... it was a lovely setup.
Did you also try without the Pass preamp, going directly from the Horizon into the amps?
 

LampiNA

Well-Known Member
Jul 1, 2015
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We did not--I think the sub towers were being output from preouts and they'd just finished setting them back up after the NY Show so we didn't want to mess with them. I'll be back over there again in the near future though and with the Quest pre next time too.

We may actually duplicate this setup for the upcoming Capital AudioFest show as I think it would make a huge impression.
 
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gleeds

Industry Expert
May 29, 2018
284
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Looking forward to it, Fred!!! Thank you.
 

gleeds

Industry Expert
May 29, 2018
284
357
150

Preamplifiers in the Digital Age - are they needed?

Quest-Heroshot.jpg
Members of WBF have discussed the importance of a system preamplifier when owning a DAC with volume control onboard. MSB. Lampizator, CH Precision, and Lumin (the ladder using Leedh signal processing ) are excellent examples of the breed. While both uses are valid, like many choices, it is also a matter of taste which sounds better.

The Quest preamplifier is an active, fully balanced dual-mono design housed in an elegant, rigid aluminum chassis. The noise floor is very low due to the extensive use of Carbon fiber inside the chassis and the use of ten separate power supplies. In designing the Quest, the goal was to create a product that would act as a flexible control center and, at the same time, make a meaningful improvement in the sound quality of your system. The Quest is also available in a two-chassis dual mono configuration for ultimate performance.

In-home demos of the Quest are available for qualified individuals.

New item: The Quest Preamplifier Precision Phono Module "PPM"


_ANG4401-HDR.jpg

Amplifying the tiny analog signals of a cartridge without distortion is a monumental task. So with this as our challenge, we set out to create a vinyl replay module for the Quest preamplifier compatible with the finest phono cartridges and delivering our hallmark sound signature - texture, transparency, detail, and dynamics. Two versions of the PPM are available with either balanced or single-ended inputs.

Here are the specifics.

Ultra-low current noise levels
Maintaining musical information in phono amplification requires a power source. Westminster's Precision Phono Module module uses specially designed power supplies inside the Quest as the primary power source. The signal then passes through a secondary filter resulting in very low measurable voltage deviation and current-related noise.

Precision RIAA Equalization
The RIAA Equalization circuit consists of only four passive components, a number far less than most phono stages on the market. However, not willing to forgo accuracy for our "less is more" circuit topology; we have also achieved within 0.5db of the RIAA reference. The result is accuracy and the ability to deliver information retrieved by the stylus as untouched as possible.

Flexible Impedance and Capacitance matching
The appropriate impedance settings are crucial to extracting the best possible performance from your cartridge. To meet these demands, we provide eighteen different impedance selections ranging from 60Ohm to 47kohm and five for input capacitance from 22p to 322pF. There are also three gain settings from 50db to 72db.

Three-stage precision amplification
Signals picked up from the cartridge are extremely small and require large multiples of amplification. Therefore, our PPM module uses an unconventional three-stage amplification process. Each stage is optimized to prevent overload and keep distortion as low as possible while acting in concert to apply accurate RIAA EQ equalization.

Bespoke Coupling Capacitors
AC signals produced by the cartridge are microscopic. Passive components used in most phono stages do not perform well in this environment. To solve this problem, the PPM uses custom capacitors to ensure distortion and coloration are at the lowest possible level, revealing newfound ease, flow, and previously obscured information.

True to the Original
Many phono preamplifiers use filters to reduce background noise and mitigate distortion. While this can result in a perceived sound quality improvement, we believe these filters rob music of critical information and add coloration. As a purist design, the PPM phono module reveals all the information found in the record groove so you can experience vinyl as it is!

The Quest preamplifier with or without phono stage is available for in-home auditions. Please get in touch with Gary Leeds via PM or email to inquire.

The Rei "Quadrablock" Amplifiers (4-chassis power solution)


Here-This-WBF-Homepage-Advert-2V3.png


The four-Rei Class A monoblocks are available where the Rei Quadrablocks leave off. From day one, the Rei used in Quadrablock configuration was designed for maximum performance and a simple upgrade path for existing monoblock amplifiers' owners. Vertical bi-amplification with a passive and active loudspeaker is also a perfect application for four amplifiers in regular unbridged mode.

Quadrablock power output
400 watts into 8 ohms
800 watts into 4 ohms

Not merely a strapped amplifier circuit, The Rei Quarablock was designed from day one to achieve maximum performance from our novel amplifier circuit topology, preserving and adding to the dynamics, detail, transparency, texture, and tonal density, and detail Reis' are becoming known.

Here-This-WBF-Homepage-Advert-1-V3.png
 

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  • Quest-Heroshot.jpg
    Quest-Heroshot.jpg
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  • Rei-Quadra-group.jpg
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Last edited:
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gleeds

Industry Expert
May 29, 2018
284
357
150
No worries m2! Thank you for the question.

There are custom-sized amplifier stands designed for us by Falken Ohr Audio/Germany and Prana Distribution. This stand design is, of course, available for other amplifiers from Falken Ohr. Naturally, Westminster amplifiers may be purchased without the stands as well.
 

ELHIFI

New Member

Preamplifiers in the Digital Age - are they needed?

View attachment 98534
Members of WBF have discussed the importance of a system preamplifier when owning a DAC with volume control onboard. MSB. Lampizator, CH Precision, and Lumin (the ladder using Leedh signal processing ) are excellent examples of the breed. While both uses are valid, like many choices, it is also a matter of taste which sounds better.

The Quest preamplifier is an active, fully balanced dual-mono design housed in an elegant, rigid aluminum chassis. The noise floor is very low due to the extensive use of Carbon fiber inside the chassis and the use of ten separate power supplies. In designing the Quest, the goal was to create a product that would act as a flexible control center and, at the same time, make a meaningful improvement in the sound quality of your system. The Quest is also available in a two-chassis dual mono configuration for ultimate performance.

In-home demos of the Quest are available for qualified individuals.

New item: The Quest Preamplifier Precision Phono Module "PPM"


View attachment 98533

Amplifying the tiny analog signals of a cartridge without distortion is a monumental task. So with this as our challenge, we set out to create a vinyl replay module for the Quest preamplifier compatible with the finest phono cartridges and delivering our hallmark sound signature - texture, transparency, detail, and dynamics. Two versions of the PPM are available with either balanced or single-ended inputs.

Here are the specifics.

Ultra-low current noise levels
Maintaining musical information in phono amplification requires a power source. Westminster's Precision Phono Module module uses specially designed power supplies inside the Quest as the primary power source. The signal then passes through a secondary filter resulting in very low measurable voltage deviation and current-related noise.

Precision RIAA Equalization
The RIAA Equalization circuit consists of only four passive components, a number far less than most phono stages on the market. However, not willing to forgo accuracy for our "less is more" circuit topology; we have also achieved within 0.5db of the RIAA reference. The result is accuracy and the ability to deliver information retrieved by the stylus as untouched as possible.

Flexible Impedance and Capacitance matching
The appropriate impedance settings are crucial to extracting the best possible performance from your cartridge. To meet these demands, we provide eighteen different impedance selections ranging from 60Ohm to 47kohm and five for input capacitance from 22p to 322pF. There are also three gain settings from 50db to 72db.

Three-stage precision amplification
Signals picked up from the cartridge are extremely small and require large multiples of amplification. Therefore, our PPM module uses an unconventional three-stage amplification process. Each stage is optimized to prevent overload and keep distortion as low as possible while acting in concert to apply accurate RIAA EQ equalization.

Bespoke Coupling Capacitors
AC signals produced by the cartridge are microscopic. Passive components used in most phono stages do not perform well in this environment. To solve this problem, the PPM uses custom capacitors to ensure distortion and coloration are at the lowest possible level, revealing newfound ease, flow, and previously obscured information.

True to the Original
Many phono preamplifiers use filters to reduce background noise and mitigate distortion. While this can result in a perceived sound quality improvement, we believe these filters rob music of critical information and add coloration. As a purist design, the PPM phono module reveals all the information found in the record groove so you can experience vinyl as it is!

The Quest preamplifier with or without phono stage is available for in-home auditions. Please get in touch with Gary Leeds via PM or email to inquire.

The Rei "Quadrablock" Amplifiers (4-chassis power solution)


View attachment 98522


The four-Rei Class A monoblocks are available where the Rei Quadrablocks leave off. From day one, the Rei used in Quadrablock configuration was designed for maximum performance and a simple upgrade path for existing monoblock amplifiers' owners. Vertical bi-amplification with a passive and active loudspeaker is also a perfect application for four amplifiers in regular unbridged mode.

Quadrablock power output
400 watts into 8 ohms
800 watts into 4 ohms

Not merely a strapped amplifier circuit, The Rei Quarablock was designed from day one to achieve maximum performance from our novel amplifier circuit topology, preserving and adding to the dynamics, detail, transparency, texture, and tonal density, and detail Reis' are becoming known.

View attachment 98535
 

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