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Peachtree GaN 1 Beta

Before I start my post here is my current system for reference:

Auarlic Aries G1 --> Denafrips Terminator or SW1X DAC --> Audio GD HE1 XLR preamp or Sachs preamp --> various tube amps --> Cube Nenuphar Mini's w/ a pair of REL S510 subs. Cables and power conditioning commensurate with the rest of the system.

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As warmer months approach I have been looking for a cool running amp to replace my Line Magnetic LM-518 and other tube amps for a few months as they run pretty hot.

I've been interested in the GaN FET amps and just purchased a used LSA Voyager 350 Gan FET amp which I should receive in a few days. I've tried class D amps before and while they checked a lot of boxes I just didn't feel drawn in. However, I like to explore so I figured I'd try the GanFET and since the amp has zero feedback and my speakers seem to prefer amps with little or no feedback I figured it be worth checking out.

Today, Peachtree Audio sent out an email inviting users to a beta of their new Gan 1 amp. Here are some excerpts from their email:

 

What is the GaN 1?

In basic terms it is a 200 Watts-Per-Channel (WPC) Power Amplifier designed to be the sole interface between your digital audio device with a variable output, like a Bluesound NODE, and your speakers. The GaN 1 is a simple, pure and cost-effective audio solution: connect the GaN 1 to a streamer and a pair of speakers and you have an amazing Hi-Fi system. That's it...no DAC, no preamp and no input switching. The signal path from the music to your speakers is remarkably short and free of artifacts. Want to hear the intricate details in your music that have always been there, but you couldn't quite make them all out before? Then the GaN 1 is for you!

What makes the GaN 1 so special?

First and foremost is the GaN-FET amplifier module. It has several inherent advantages in a power amplifier that even the best MOS-FET designs simply cannot achieve. A GaN-FET power stage provides a precise high-power reproduction of the Class-D PWM signal with extremely high linearity. This linearity eliminates the need for ANY feedback, ultimately allowing for the best possible audio quality providing clean, clear middle and high frequencies and a tight, solid reproduction of low frequencies. GaN-FETs track the complex audio waveforms MUCH more accurately than MOS-FETs, resulting in significantly more transparent and natural sound. The difference is something even a casual listener can hear and appreciate. The GaN 1 is also designed so that it does NOT require a digital-to-analog-converter (DAC). The digital audio signal at the input directs the amplifier outputs to drive the speakers. Although DACs have continued to improve over the years, there is no DAC better than NO DAC! This concept is not new as similar devices known as "Power DACs" made quite a splash in our industry years ago. But this time around, by executing the concept with GaN-FETs, the bar is raised to an entirely new level.

Key Features at a Glance:
▪ 200 WPC state-of-the-art GaN-FET module
▪ ZERO feedback design
▪ Regulated 450-Watt power supply
▪ Coaxial S/PDIF input with native support up to 24-bit / 192kHz
▪ DAC-less design
▪ Power on/off trigger port
▪ All aluminum chassis
▪ No cooling fans

 

This sounded really interesting to me and since I have a good streamer I signed up for the amp beta only. One aspect that intrigues me is to create an extremely minimal signal path. My speakers are single driver, crossover-less design. Employing the GaN 1 will mean the system will be Auralic Aries --> GaN 1 --> Cube Nenuphar Mini's. Will that lead to a more engaging sound vs the full system? Will the Voyager GaN 350 outperform a tube amp in the full system? Who knows, should be fun to find out....

Now, I have no idea how either of these GaN FET amps will work with my speakers. The Cube Nenuphars seem to prefer amps with low damping and no negative feedback, which is more common with SET tube amps and Class A solid state amps. I'm not sure of the damping factor of the GaN FET amps, but both are Zero feedback designs, and both have way more wattage than I need. For reference, I have a 1.5 wpc 45 tube amp that sounds amazing with the Cubes, so high wattage is not required. I am interested though in what these amps will sound like compared to my tube amps, and I am particularly interested in what the streamer direct to amp Peachtree will sound like.

I am also looking to acquire a First Watt SIT-3, which is a great match with the Cubes, but now that they are no longer produced prices have gone above my current comfort level. If I can get one I will throw it into the experiment.

The Peachtree won't be shipped until sometime in June, or possibly later. In the meantime I will get the LSA Voyager in the next few days. I might even be able to get it hooked up this weekend so stay tuned, should be an interesting experiment...
abd1
evank's avatar
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evank
304 posts
 

This was just posted on Peachtree Facebook page

 

 

 

Are zero feedback amplifier designs like the GaN 1 susceptible to speaker impedance?"

The short answer is yes. The longer answer, for the GaN 1, is that a 4 Ohm speaker load will generate a ~1dB softer top-octave response. Below are the actual AP measurements showing the GaN 1 amp module with an 8 Ohm load (top lines in cyan and green) and a 4 Ohm load (bottom lines in yellow and red). You can see they are flat lines until ~4-5K, then the 4 Ohm load creates as gentle rolloff of about ~1.2dB at 20K compared to an 8 Ohm load.

What does THAT sound like? Many probably won’t even notice it due to their own hearing sensitivity at those frequencies, but some may perceive it as an ever so slightly "laid back" or "polite" presentation.

We do NOT "voice" the GaN 1 to sound any particular way as you can see. It is ruler flat with an 8 Ohm load, but we do get frequently asked "what will MY speakers sound like with the GaN 1?" And below is the most objective answer we can provide.

Unfortunately, what we haven’t figured out how to measure yet is how to chart how open and transparent the GaN 1 sounds. The ear/brain is an incredibly complex system and this is one instance where the measurements are FAR less meaningful to what will actually be heard. Compared to pretty much any other amplifier we have put up against the GaN 1, the difference is NOT subtle.

 

May be an image of text that says 'Audio Precision DigiGaN-200S RevA, +/-32V Rail Freq Response @ -9dBFS 03/24/21 15:07:35 16 50 100 200 Sweep Trace Color 500 Line Style 1k Thick Data Solid Solid Cyan Green Yellow 2k Axis Comment 5k Anlr.Level Anir.Level Left 10k Ch1, -9dFS n, -9dFS 56.2 20k Out Dut 8-Ohms 8-Ohms 04 Freg Response at27'

 

kitsap2
24 posts
 

evank posted: This was just posted on Peachtree Facebook page

Thanks for sharing this post as I do not have FB.

yyzsantabarbara
4,797 posts
 

I know some digital cables should not be too long. What is the max length suggested for SPDIF cables. I have a great location to put the GAN1 amp (for headphone use) and I would get a lot less grief from the wife if I could hide my 2 streamer units in the TV cabinet. Then have a 10-foot SPDIF cable to the GAN1 running under a carpet. Maybe not audiophile but musicphile also works for me.

A 10-foot SPDIF cable a good or bad idea?

 

kitsap2
24 posts
 

yzzsantabarbara, I don't know if I'm missing something, but how will you use headphones with the GaN 1?

yyzsantabarbara
4,797 posts
 

@kitsap2 This video will describe my 2 headphones. I have 2 of the older RAAL amp interface boxes ($700) to the SR1a earphones. My older amp interface box will not work with the circumoral CA-1a headphone, but I have 2 other dedicated headphone amps in the house for that one. I say all of this while not being a fan of regular headphones. The SR1a do not sound like headphones and the reviewer below did not like them for that reason.

(1) What’s a RIBBON headphone? RAAL Requisite CA-1A Review with Resolve! | Headphone Reviews and Discussion - Head-Fi.org

I will be using the GAN1 with 1 of my existing RAAL amp interface boxes. I am now reading that the tone of the GAN1 amp is slightly warm, this is great for the SR1a.

The SR1a earphones are my very best setup and I know three 2-channel people that sold their 2-channel system, including someone with Magico, because the SR1a was comparable or better.

The GAN1 will be compared against the following amps I have used with the SR1a. I know for sure that it will not be as good as the dedicated RAAL VM-1a amp because the amp interface box is not needed there. However, 2 of the amps listed below got me real close to the VM-1a (the 2 KRELL’s)

  • Benchmark AHB2 stereo and mono (only amps still in the house)
  • KRELL K-300i integrated
  • KRELL DUO 175XD
  • CODA CSiB integrated
  • CODA #8
  • NAD M22 V2
  • Parasound A21+
  • LSA Voyager 350 GAN (pre and post EVS mods)
  • D-Sonic M3a 800s

I will also be using very short Audience AU24SX speaker cables which I bought specifically for this GAN1 + SR1a test. I also have a longer WyWire "Silver" speaker cable to test the GAN1 with my KEF LS50 Meta’s. However, the LS50 test is not that useful to me since I will not be able to integrate my KEF KC62 sub with the GAN1 given my current streaming gear (Sonore opticalRendu).

The best preamp for these amps and the SR1a was the CODA 07x preamp. I no longer have that preamp. The Musetec 005 DAC, a warm-ish and smooth DAC was perfect on the amps above and the 07x. The GAN1 has no preamp and no extra DAC and no interconnects. My very best SR1a 2-channel setup cost close to $30K while the GAN1 setup will be $4800.

You asked a simple question and look what I rambled on about :)

 

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