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Thread: BOSC - HiFi Monoblock Class-D Amp

  1. #21
    Join Date: Jan 2009

    Location: Essex

    Posts: 20,725
    I'm openingabottleofwine.

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    Quote Originally Posted by orchardaudio View Post
    I do not have this type of speaker. I don't see any issue with it. The performance will still be very good as long as the load presented to the amplifier is in the 4 to 8 ohm range.

    Where are you located I can potentially send you sample units to try in 3 to 4 weeks.
    That is very kind of you, but my speakers present a very difficult load to the amplifier (varying over an impedance range of 30 Ohm to 1.5 Ohm), so I don't think your amplifiers would suit.

    Thanks anyway for the offer.
    Barry

  2. #22
    Join Date: May 2016

    Location: Notts

    Posts: 2,244
    I'm Geoff.

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    Quote Originally Posted by Barry View Post
    That is very kind of you, but my speakers present a very difficult load to the amplifier (varying over an impedance range of 30 Ohm to 1.5 Ohm), so I don't think your amplifiers would suit.

    Thanks anyway for the offer.
    I have Magneplanar 1.7 speakers which present a much more difficult load than the QUADS. I can strongly recommend the NuPrime STA-9 power amp. I use a pair of these in mono mode which output just under 300w. They provide a vice like grip on the Maggies with a very smooth tube-like sound. NuPrime have recently introduced a slightly lower powered model (the STA-6), which I am sure would be great with the QUADS.

  3. #23
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 116
    I'm Leo.

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    I have a friend with the Magnapan 1.7i speaker, BOSC had no issues with those.

  4. #24
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 116
    I'm Leo.

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    A pair of these is on their way to Oli for evaluation.

    Also if you are interested I posted the latest performance measurements here:
    https://www.audiosciencereview.com/f...-2#post-210892

  5. #25
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,313
    I'm Oliver.

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    Quote Originally Posted by orchardaudio View Post
    A pair of these is on their way to Oli for evaluation.

    Also if you are interested I posted the latest performance measurements here:
    https://www.audiosciencereview.com/f...-2#post-210892
    Yes they are!

    I'm looking to give these a thorough test as it'll be a first in depth Class D experience for me other than a ICE derived power amp I tried for 10 minutes, which wasn't as impressive as I'd have liked.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Raspberry Pi 3+/Allo Boss 1.2/Isolator 1.3 & Firebottle LPSU with Volumio & JRiver
    Amplification: Nelson Pass Derived DCB1 with Khozmo 48 Step Series Attenuator & Neurochrome Modulus 686 Amplifier
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  6. #26
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,010
    I'm Alan.

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    Quote Originally Posted by Barry View Post
    That is very kind of you, but my speakers present a very difficult load to the amplifier (varying over an impedance range of 30 Ohm to 1.5 Ohm), so I don't think your amplifiers would suit.

    Thanks anyway for the offer.
    I have driven my '57's with 3 different class D amps without any problem Barry.

  7. #27
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 116
    I'm Leo.

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    An awesome review for the BOSC amp:

    "Class-D amplifiers generally trigger reactions and opinions of a generic, mass-market sound. And Iíll admit, I tend to not be too curious about anything based around that amplification method. But Leonid (Leo) Ayzenshtatís Class-D amplifiers continually force me to think differently. They prove that it isnít about the type of thing, but rather about how skillfully a thing is made."

    "I wanted to stop my heart so I could hear the music better. I was being sucked in, pushed out, and unable to focus on anything else but the music. There were all the little bird-like chimes, dancing between clicks and pings and bongs of xylophone harmonics with dry reed raspy sounds zooming in and out, floating on top of deep rolling strings and organ-like bass. I didnít want to miss a moment of it."


    Read the full review here:
    https://theaudiobeatnik.com/reviewin...sc-monoblocks/

  8. #28
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 116
    I'm Leo.


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