Author Topic: BOSC™ - HiFi Monoblock Class-D GaN Amp  (Read 1330 times)

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
BOSC™ - HiFi Monoblock Class-D GaN Amp
« on: June 29, 2019, 02:12:12 PM »
BOSC uses the latest in Gallium Nitride (GaN) technology to achieve high performance in a small form factor.

The low on resistance and low capacitance of the GaN FET enables high efficiency and lowers loop impedance for low Transient Intermodulation Distortion (T-IMD). The fast switching capability and zero reverse recovery charge enable higher output linearity and low cross over distortion for lower Total Harmonic Distortion (THD).

Preliminary Specifications:
  • Gain: 16.8dB or 6.92
  • Signal to Noise Ratio (SNR): ~120dB
  • Total Harmonic Distortion (THD): <0.0006% (-105dB) @ 5W
  • Frequency Response: DC - 40kHz
  • Sensitivity: 2.5Vin for 37.5W into 8Ω
  • Input Impedance: 5kΩ fully balanced
  • Output Power: 100W into 8Ω w/ 48V Power Supply
  • Output Power: 150W into 8Ω w/ 56V Power Supply
  • Size:  5.5" (14cm) x 4.8" (12.2cm) x 1.9" (4.8cm)

Sign up to get updates and receive special early bird pricing on the amazing BOSC™ monoblock amp:
https://www.indiegogo.com/projects/bosc-hifi-monoblock-class-d-amp/coming_soon

Offline Folsom

  • Obsessively Audiophilic
  • ****
  • Posts: 341
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #1 on: June 29, 2019, 02:59:24 PM »
Well, you'll need a preamp with a hell of a lot of gain for that! Low for balanced is 20db, 26-32db is typical SE.

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #2 on: June 29, 2019, 03:34:08 PM »
Well, you'll need a preamp with a hell of a lot of gain for that! Low for balanced is 20db, 26-32db is typical SE.

If you have a PecanPi product no pre-amp needed.

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #3 on: June 30, 2019, 04:23:50 AM »
Preliminary THD vs Power Plot:

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #4 on: July 09, 2019, 10:30:44 AM »
If you are really interested in this product and would like to be one of the first people to get it at a reduced price, reserve now for $1. Only 55 spots available:
https://orchardaudio.com/shop?olsPage=products%2Fbsc-mplfr

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #5 on: July 12, 2019, 02:10:37 PM »
Full pricing information and updated specs available on my website here:
https://orchardaudio.com/bosc

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #6 on: July 14, 2019, 06:07:00 PM »
I am looking for people who would be interested in trying these amps and posting their findings.

Offline HAL

  • Obsessively Audiophilic
  • ****
  • Posts: 750
  • Audio Mad Scientist
    • Hollis Audio Labs
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #7 on: July 14, 2019, 07:21:45 PM »
I am on the list and will be trying them with The Monoliths fully active speaker when I get them.

Comparison is to a pair of Parasound A23 amps on the planar drivers.

Offline mdconnelly

  • Audio Neurotic
  • *****
  • Posts: 1366
  • new ways to dream...
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #8 on: July 15, 2019, 07:24:52 AM »
I am looking for people who would be interested in trying these amps and posting their findings.

Leo, I'd definitely be interested, but not until I've got my PecanPi and I can borrow a pair of BOSC to test.   So timing wise, it may not be ideal for you.

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #9 on: July 15, 2019, 10:22:22 AM »
I am looking for people who would be interested in trying these amps and posting their findings.

Leo, I'd definitely be interested, but not until I've got my PecanPi and I can borrow a pair of BOSC to test.   So timing wise, it may not be ideal for you.

If everything goes according to plan I will be shipping your PecanPis before the end of the month. And then follow up with the amps sometime in the middle of August.

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #10 on: August 10, 2019, 05:09:56 PM »

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #11 on: August 12, 2019, 06:07:37 PM »
An awesome review for the BOSC amp:

"Class-D amplifiers generally trigger reactions and opinions of a generic, mass-market sound. And I’ll admit, I tend to not be too curious about anything based around that amplification method. But Leonid (Leo) Ayzenshtat’s Class-D amplifiers continually force me to think differently. They prove that it isn’t 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 didn’t want to miss a moment of it."*

Read the full review here:
https://theaudiobeatnik.com/reviewing-the-orchard-audio-bosc-monoblocks/

Offline mdconnelly

  • Audio Neurotic
  • *****
  • Posts: 1366
  • new ways to dream...
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #12 on: August 13, 2019, 05:28:27 AM »
Fascinating review Leo!    I suspect many of us have a pre-determined perception of Class D amps although they certainly have improved since the early days.    I'm really looking forward to having a chance to hear what your new amps can do soon.   

Offline rollo

  • Industry Participant
  • *
  • Posts: 5792
  • Rollo Audio - Home demo the only way to know
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #13 on: August 13, 2019, 11:56:55 AM »
  Leo you have come a long way since I spoke to you at our AuduiSyndrome meeting. It appears that the amps need the PecanPi as a system.
  I like the concept of your amp however with only 5K Ohm input may be hard to match my preamp. What to do ?

charles
contact me  at rollo14@verizon.net or visit us on Facebook
Lamm - Aqua Acoustic Formula & La Scala DAC- INNUOS  - Rethm Speakers - PI Audio Uberbuss - Triode Wire Labs- Kuzma - Furutech - Audio Hungry Qualiton - Fritz Carrera speakers -Gigawatt-Arion

Offline orchardaudio

  • Industry Participant
  • *
  • Posts: 136
  • How do you like them apples?
    • Orchard Audio
Re: BOSC™ - HiFi Monoblock Class-D GaN Amp
« Reply #14 on: August 13, 2019, 01:29:21 PM »
  Leo you have come a long way since I spoke to you at our AuduiSyndrome meeting. It appears that the amps need the PecanPi as a system.
  I like the concept of your amp however with only 5K Ohm input may be hard to match my preamp. What to do ?

charles
What is the output impedance and output drive of your pre-amp?

BOSC was designed with the PecanPi in mind, that does not mean it will not work with other equipment. There is plenty of equipment out there that can drive 5k with no issues.