2. amps-preamps
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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
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 :)

 

kitsap2
24 posts
 

@yyzsantabarbara Yikes!  You certainly did answer my question in spades!  Thank for enlightening me into the world of specialty products.  I'm not at this level of music listening, but it's always fun learning something new.

I have the GaN 1, Bluesound Node, and am really satisfied with that arrangement.  If Bluesound made a 200wpc Powernode, I'd have purchased that.

Party on, Garth!

yyzsantabarbara
4,797 posts
 

I have not received my GAN1 unit yet but I did receive all the extra streaming parts I listed in a prior post:

  • WyWiire "Silver" SPDIF cable with BNC to RCA termination
  • Sonore UltraDigital
  • a cheap USB cable (I have a WyWIre USB also but I am not bothering to use it since it is used elsewhere)
  • Sonore OpticalRendu + LPS
  • Fibre Optical outputs in a nice network switch
  • ROON

I am posting this because I was worried it would not work and it was also a bit tricky getting this to work. It is working now and sounds really nice on my Musetec 005 (via i2s) and Benchmark DAC3B (via SPDIF). I am using ROON’s volume control and set my Benchmark preamp to a high volume level.

Step 1: Connect all the wires. The UltraDigital is powered by the USB cable from the OpticalRendu. This is likely the weakest point in my setup.

Step 2: Since the Rendu is ROON READY, go to the ROON Client and select the DEVCE SETUP. There is a bug in ROON that does not enable the SAVE button, so change the MQA setting to enable the SAVE button. Press SAVE, then reset the MQA to whatever was set before, then SAVE again.

Step 3: Log onto the Sonore management web site running on your local Sonore web server. It is on the Rendu. it is running at this address, http://www.sonicorbiter.com/

Step 4: Select MANAGE for your Rendu. I have 3 OpticalRendu’s and have renamed them to help identify the endpoint.

Step 5: Click SETTINGS

Step 6: Click ROON READY SETTINGS and change the VOLUME CONTROL to SOFTWARE. Save changes.

Step 7: The volume icon on the lower right of the ROON Client will now allow you to change volume.

Changing the volume is actually done well. It sounds damn fine with my current gear. Benchmark LA4 preamp + Benchmark AHB2 monos + 2 DACs

 

 

 

dolfan
109 posts
 

I got the Gan 1 a couple days ago. Can only compare it to my Classe Sigma integrated. The difference is night and day. I like it. So simple yet so good. Using the Node with it. 2.1 setup for TV and streaming. I posted this in Digital thread earlier by mistake.

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