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Thread: Orchard Audio's BOSC - Review

  1. #11
    Join Date: Jan 2008

    Location: West Yorkshire

    Posts: 234
    I'm Andy.

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    Received the amps this morning and had them running this afternoon for a few hours with various different types of music.
    So far so good.
    Will listen more intently over the next few days and let you all know what I find.

    Had to move a few pieces around to get them connected up......





    Main system:

    Digital.
    Philips DCC 730
    Technics SL-PJ28A CD Player
    Analogue.
    Michell Orbe with arm decoupling kit & Pete's Pylons. AudioNote Arm 1 V2. Goldring Elite MC and Firebottle OTP MKII Phono Amp
    Lenco L75 in Birch ply plinth. Linn Basik Plus. A&R P77 cart (Paratrace by Expert) VSPC MM Phono Amp
    Network Player.
    Raspberry PI plus IQAudio DAC+ (also used as a CD player) plus Pi NAS Server
    Amp.
    Burson Bang V6 Classic (Pure Sound A30 going into storage soon)
    Speakers
    Reiver Jenna floor standers
    HeadPhones.
    Sennheiser HD545 Ref, HD600, HD477
    Headphone Amp
    Myryad Z40 (also used as a pre amp)
    Backup Speakers.
    Heybrook HB1, TDL RTL2, Some home made concoction...
    Backup Amps
    Audiolab 8000a, Armstrong something or other, Amstrad Quadraphonic something or other, home built EL34 power amps.....

  2. #12
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 131
    I'm Leo.

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    Quote Originally Posted by gninnam View Post
    Received the amps this morning and had them running this afternoon for a few hours with various different types of music.
    So far so good.
    Will listen more intently over the next few days and let you all know what I find.

    Had to move a few pieces around to get them connected up......





    Looking forward to your findings. Nice looking setup you have there.

  3. #13
    Join Date: Jan 2008

    Location: West Yorkshire

    Posts: 234
    I'm Andy.

    Default

    Had a few good days listening to the amps using my Myryad preamp and various front ends – Orbe through the Firebottle Phono amp, Technics CD player and also the Raspberry Pi, using stored FLAC files and the CD player up sampling the tunes to 176.4Khz on the Pi.

    Start with the TT first. Started with some simple music, not over produced with generally just voice and simple arrangements (David Sylvian being one) and found the amps to allow the music to flow without appearing to not add or subtract anything.
    Found it very easy to get lost in the music and before you know it the LP had finished. Wonderful.

    Next up was music with more going on, more electronic and a bit faster paced (such as later recordings by A Certain Ratio) – midrange was very good (valve like) but the bass seemed a bit more muddled compared to the Burson and the Pure Sound valve amp – no real issues with the high frequencies, perhaps a bit forward but not in your face.

    Next up, let’s go digital so step forward Mr Pi. Again, started with some simple (in structure and instrument wise) using FLAC files (such as Ludovico Einaudi) and absolutely no issues – the music appears to come across with nothing added or taken away and found it enjoyable. Used the same music through the CD players and very similar to the FLAC file (apart from the Technics CD player seemed to add extra sparkle to the highs – not the amps fault!!)

    Tried it using more electronic (Nine Inch Nails) and faster paced (808 State) music on CD and FLAC format. Similar to what I heard using the TT, the bass a little muddled at times but nothing too detracting and on CD, the highs sometimes brighter than using FLAC or the TT so not a fault of the amps.

    Very satisfied with how the amps were performing.

    Next few days I took the Myryad preamp out of the equation and used a passive preamp (thanks BigBottle) and also the Pi direct to the amps.

    The main difference with the PI now going direct was the bass seemed to be grasped better than when using the Myryad so perhaps the synergy with this and the BOSC amps wasn’t quite there (will look into this later).

    Using the Passive Pre, I tried the TT and found that the simpler music worked very well, although less impact from the bass than before but the rest of the audio spectrum sounded great then moved to digital music. Much as before with the same issue with CD and the highs.

    Went back to the Myryad and dug out some older (not sure who made them or where I got them from) interconnects and replaced the ones from between the preamp and the BOSC amps.

    Noticed a slight improvement with more complex and electronic music in the bass registers – not a massive change but a little clearer in the lower registers.

    Summary.
    In general, I found the amps to be very good (a slight step up on the Burson but I need to do some opamp rolling) and on par with the valve amp – perhaps better grip when the volume is cranked up.
    Liked the small form factor but found the PSU’s sizes to be on the large size.
    Didn’t find the sound to be ‘digital’ at all but did prefer them with more simple music (as you could probably tell with from the text above), but paired with the correct preamp and cabling I am sure will work a lot better for more complex tracks – the more I tweaked the better they sounded.

    Hope the above helps anyone interested in these.
    Main system:

    Digital.
    Philips DCC 730
    Technics SL-PJ28A CD Player
    Analogue.
    Michell Orbe with arm decoupling kit & Pete's Pylons. AudioNote Arm 1 V2. Goldring Elite MC and Firebottle OTP MKII Phono Amp
    Lenco L75 in Birch ply plinth. Linn Basik Plus. A&R P77 cart (Paratrace by Expert) VSPC MM Phono Amp
    Network Player.
    Raspberry PI plus IQAudio DAC+ (also used as a CD player) plus Pi NAS Server
    Amp.
    Burson Bang V6 Classic (Pure Sound A30 going into storage soon)
    Speakers
    Reiver Jenna floor standers
    HeadPhones.
    Sennheiser HD545 Ref, HD600, HD477
    Headphone Amp
    Myryad Z40 (also used as a pre amp)
    Backup Speakers.
    Heybrook HB1, TDL RTL2, Some home made concoction...
    Backup Amps
    Audiolab 8000a, Armstrong something or other, Amstrad Quadraphonic something or other, home built EL34 power amps.....

  4. #14
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 131
    I'm Leo.

    Default

    Quote Originally Posted by gninnam View Post

    Hope the above helps anyone interested in these.
    Thank you for taking the time to do this.

    Quote Originally Posted by gninnam View Post

    Didn’t find the sound to be ‘digital’ at all
    BOSC is purely an analog amplifier with the PWM being determined in the analog domain. The PWM is then amplified by the GaN power stages.

    Class-D has somehow become associated with digital over the years. The "D" does not mean digital it was just the next letter in the alphabet for classes.

    Class-D simply means switching amplifier, while a lot of companies use digital processing in their class-d amplifiers this is not required.

  5. #15
    Join Date: Jan 2008

    Location: West Yorkshire

    Posts: 234
    I'm Andy.

    Default

    Quote Originally Posted by orchardaudio View Post
    Thank you for taking the time to do this.
    Your welcome!
    Main system:

    Digital.
    Philips DCC 730
    Technics SL-PJ28A CD Player
    Analogue.
    Michell Orbe with arm decoupling kit & Pete's Pylons. AudioNote Arm 1 V2. Goldring Elite MC and Firebottle OTP MKII Phono Amp
    Lenco L75 in Birch ply plinth. Linn Basik Plus. A&R P77 cart (Paratrace by Expert) VSPC MM Phono Amp
    Network Player.
    Raspberry PI plus IQAudio DAC+ (also used as a CD player) plus Pi NAS Server
    Amp.
    Burson Bang V6 Classic (Pure Sound A30 going into storage soon)
    Speakers
    Reiver Jenna floor standers
    HeadPhones.
    Sennheiser HD545 Ref, HD600, HD477
    Headphone Amp
    Myryad Z40 (also used as a pre amp)
    Backup Speakers.
    Heybrook HB1, TDL RTL2, Some home made concoction...
    Backup Amps
    Audiolab 8000a, Armstrong something or other, Amstrad Quadraphonic something or other, home built EL34 power amps.....

  6. #16
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 131
    I'm Leo.

    Default

    Kickstarter launching next week. Check out the project video:
    https://youtu.be/qo4ssUfE4rg.

    Sign up for our mailing list to learn when Kickstarter project goes live:
    www.orchardaudio.com/bosc

  7. #17
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 131
    I'm Leo.

    Default

    Kickstarter is live! Grab the early bird special while supplies last:
    https://www.kickstarter.com/projects...ier?ref=1hvtb6

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