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Thread: Bigblog - The Revolving Door of HiFi Auditioning

  1. #571
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,567
    I'm Oliver.

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    Quote Originally Posted by crimsondonkey View Post
    "First thing you learn is that you always gotta wait..."
    Lol, so true.
    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

  2. #572
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,567
    I'm Oliver.

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    Leo from Orchard Audio has kindly sent me some of his BOSC Class D Amplifiers to try.

    Also got another "tweaked" Pecan Pi which I'm going to give another listen.
    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

  3. #573
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 133
    I'm Leo.

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    Quote Originally Posted by Bigman80 View Post
    Leo from Orchard Audio has kindly sent me some of his BOSC Class D Amplifiers to try.

    Also got another "tweaked" Pecan Pi which I'm going to give another listen.
    Looking forward to your feedback/findings.

  4. #574
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,567
    I'm Oliver.

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    Quote Originally Posted by orchardaudio View Post
    Looking forward to your feedback/findings.
    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

  5. #575
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,567
    I'm Oliver.

    Default Orchard Audio – BOSC Class D Monoblock Amplifiers Review .......... PART 1

    The BOSC is the brain child of Leo, who has been developing his OA brand for the last couple of years. The amps are all analogue and have a total output of 150w.

    Diminutive in size, barely bigger then a CD Jewel case on the face and maybe 2 inches deep, they are designed to be on short speaker cables and hidden behind your speaker, an antidote to ego stroking big brand mentality.

    The amps were left running and in place for 48hrs prior to any critical listening.

    The system consisted of a DCB1 preamp, Pioneer CS-77A Speakers, Allo Boss & RPI streaming via JRiver and Spotfire Cables throughout, which although isn’t the ideal setup, is the only setup I had available to use. Real world situations exist here so I felt it served a purpose.

    I started the listening with a few well know (to me) tracks and although I felt the amps were incredibly clear, I wasn’t feeling particularly “connected” to the songs. I tried a few tracks and I just wasn’t getting into the songs in the same way as usual. I decided to try a meatier set of cables, so I dug out my Spotfire “Emeralds” from the garage and plumbed them in. The Emeralds have a chunkier sound, so it was a good start that the BOSC demonstrated what I knew to be true already.

    I put a few tracks on and straight away I felt a bit more involved but still felt like a bit of something was missing. I contacted Leo and explained that, and he said if I was to use shorter speaker cables, all would be well. I hadn’t got anything sufficient at this time, so I thought I’d just listen and get something sorted out later.

    I put on Dave Brubecks “Take 5” and sure enough, the bit that was missing was some “slam”
    The kick drum that forms the start of the song didn’t quite hit me in the chest in the way I have become accustomed to. However, before I knew it, I had just finished the whole album and hadn’t noticed the last hour or so had passed.

    Hmm, I thought in a puzzled way.

    Donavon was next. Universal solder to be precise. Donavon’s vocals soared out of the speakers in a way I haven’t experienced before. They were so clean and clear that I was genuinely taken aback. I sat here listening to the songs, one after another and again, the last song of the album came on and yes, I’d listened to every track intently, but the time had flown. I thought I had better write a few things down and decided to start with the gob iron (harmonica)

    The gob iron and Donovans vocals were absolutely crystal clear. I will say this now……….OPEN WINDOW

    I haven’t had an amplifier here that gets you as deep into to the recording as the BOSC. Stunningly transparent and neutral. I was hearing the tape “warble” on the second guitar track. I was hearing fret buzz, contrasting harmonics from the strings on the guitar, the plectrum land on the strings, you name it, if the mic picked it up, I was getting it here. Revelatory.
    I played a plethora of acoustic guitar tracks and every one of them drew me in and captivated me.

    I needed to change genre and did so.

    Madness – Greatest hits.

    House of fun started up and yes, superb clarity and transparency but the lower registers were slightly recessed, and I wasn't really “feeling” the bass line. Don’t get me wrong, the detail from the bass is there but its not punching my chest. I am a huge believer that the bass line underpins everything else, so if that’s not right, we ain’t gonna get on!

    I must try something loud.

    On went Metallica – The God that failed.

    Unfortunately, in this instance it was the amp that failed, failed to give me sufficient levels of chest vibrations.

    Again, I am hearing details and layers of this track that I have NEVER heard before but IMO its missing the weight I know this track gives and more importantly, I am not wanting to smash the house up and scream the lyrics at my neighbours wall. This is a problem.

    I decide to do a bit more experimentation and play a few tracks via vinyl. For almost everything, the bass issue isn’t and issue via vinyl and again, I have spent at least 2 hours just letting albums run through and enjoyed every second of them.

    I decide to see whether the amps would sound as good via Volumio. As suspected and in accordance with my experience, Volumio “fattens” the sound somewhat and this is very apparent here.
    I played “Talk Tonight” by Oasis and by god, the hairs stood up on end, but it lost some nuances, micro detail and a bit of the imaging, likely caused by the lack of up-sampling without JRiver. I was streaming at 32/96 and now we’re at 16bit. Once again, the whole Oasis back catalogue is at risk of being auditioned and I must get up and walk away for a few minutes to get my brain around what I have heard.

    SO, what do I think?..........

    The BOSC are phenomenal imagers. I played some classical music via vinyl and sat here feeling like I was at a Royal tea party. It was all very polite and dignified. An air of prim and proper about it. Delightful, but not dramatic, Safe not stirring.

    I played some acoustic guitar tracks and I heard deep into the recording. I was absorbed and engrossed. I played some metal and whilst being dazzled by the amount of detail and new things I hadn’t heard before, I didn’t feel very metal at all. No head banging, not screaming at the neighbors and the family were all relatively unperturbed by my behavior.

    Truth is, I loved most of my music via the BOSC but it seemed to me that the experience varied, alum by album. On the good stuff, they were phenomenal. Bass was tight and dynamic, and the clarity was unbelievable at times. However, on other stuff, it was like the bottom end had been rolled off and the emphasis was on the HF. I’d like to say that it was poor mixing or something but I have material here that is deliberately mixed to have a hump in the mids and it sounded “normal”.

    29 Palms – Robert Plant being one of them. I have this track for this exact reason and yet through the BOSC, it sounded normal....balanced.

    The Beatles 50th anniversary Sgt. Pepper always sounds a little bass heavy here, regardless of amplifier and again, it just didn’t.
    So there are a couple of reasons why this could be….

    1) The BOSC need shorter speaker cables as advised or

    2) The BOSC are a little lean.

    Tomorrow I will investigate further.

    To be Continued.
    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. #576
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,078
    I'm Alan.

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    Good to read of your findings, however ' The amps are all analogue ..' can't quite be the case if they are Class D.

  7. #577
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 133
    I'm Leo.

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    Quote Originally Posted by Firebottle View Post
    Good to read of your findings, however ' The amps are all analogue ..' can't quite be the case if they are Class D.
    Class-D is a misnomer, it does not mean digital. It just means switching amplifier.

    This amp does not have any digital parts like processors or FPGAs, the modular is composed of op-amps and a comparator, then the switching is amplified with GaN transistors.

    Hence this is a fully analog Class-D amp.

  8. #578
    Join Date: Jan 2013

    Location: Birmingham

    Posts: 4,837
    I'm James.

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    Makes good reading Oli and maybe a mixed ability and strengths. True this can be said of all amps as rarely do they do everything you want.

    Personally I would sacrifice gut wrenching bass for transparency and clarity but the amp has to be involving, you have to believe the person is there which the BOSC seems to achieve.

    Good review mate.
    VPI Scout 1.1 - Ortofon 2M Black FGS - Croft 25R+ - Croft Series 7 - Spendor SP2

  9. #579
    Join Date: Feb 2008

    Location: Down South

    Posts: 2,379
    I'm Neal.

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    Quote Originally Posted by orchardaudio View Post
    Class-D is a misnomer, it does not mean digital. It just means switching amplifier.

    This amp does not have any digital parts like processors or FPGAs, the modular is composed of op-amps and a comparator, then the switching is amplified with GaN transistors.

    Hence this is a fully analog Class-D amp.
    It’s still a PWM signal though isn’t it? So yes not ‘digital’ as such but also not all analogue....
    Listening in a Foo free Zone...

    Only a Sith deals in absolutes.

  10. #580
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,567
    I'm Oliver.

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    Quote Originally Posted by Jimbo View Post
    Makes good reading Oli and maybe a mixed ability and strengths. True this can be said of all amps as rarely do they do everything you want.

    Personally I would sacrifice gut wrenching bass for transparency and clarity but the amp has to be involving, you have to believe the person is there which the BOSC seems to achieve.

    Good review mate.
    It's a really interesting listen Jim. As always you are welcome to pop in for a listen.

    That's only part one by the way lol.
    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

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