Starkrimson® Ultra (500W) Specs and Test Results Specifications

Specifications

Gain Balanced Input: 19.05dB
Signal-to-Noise Ratio (SNR): 120dB (A-weighted, 22kHz BW)
Residual Noise: 44.72uV (A-weighted, 22kHz BW)
THD* @ 10W: <0.0004% (-108dB) for 1kHz into 8Ω
THD @ 0.25W: <0.0016% for 20Hz – 20kHz into 8Ω
THD @ 10W: <0.0006% for 20Hz – 20kHz into 8Ω
THD @ 62.5W: <0.001% for 20Hz – 20kHz into 8Ω
THD @ 250W: <0.016% for 20Hz – 20kHz into 8Ω
THD @ 10W: <0.0005% (-106dB) for 1kHz into 4Ω
THD @ 0.25W: <0.0021% for 20Hz – 20kHz into 4Ω
THD @ 10W: <0.0007% for 20Hz – 20kHz into 4Ω
THD @ 125W: <0.0018% for 20Hz – 20kHz into 4Ω
THD @ 500W: <0.08% for 20Hz – 20kHz into 4Ω
SINAD** @ 5W 1kHz: 102.5dB into 16Ω
SINAD @ 5W 1kHz: 100dB into 8Ω
SINAD @ 5W 1kHz: 97dB into 4Ω

Frequency Response: DC – 80kHz+
Sensitivity Balanced Input: 5Vin for 250W into 8Ω
Sensitivity Balanced Input: 5Vin for 500W into 4Ω
Balanced Input Impedance: 44kΩ
Output Power (16Ω): 125WRMS (250WPEAK)
Output Power (8Ω): 250WRMS (500WPEAK)
Output Power (4Ω): 500WRMS (1000WPEAK)
Output Power (2Ω): 250WRMS (500WPEAK)
Damping Factor: >700 @ 1kHz
Module Size: 4.95″ (125.7mm) x 3.75″ (95.3mm) x 1.45″ (36.8mm)
Module Weight: 8.75oz (248g)
Power Supply Input Voltages (rev 3.0+ modules): +/-36V (+/-30 to 43.4V)
Power Supply Input Voltage (stereo/mono amp): 95 to 265VAC
Efficiency module (Rev 3.0): click here
Efficiency (stereo/mono amp): ~85%

*THD – Total Harmonic Distortion
**SINAD – Signal-To-Noise And Distortion Ratio

Test Results

8Ω Load

10W Output at 1kHz with FFT, Gain and THD+N showing

THD+N vs Power for 100Hz, 1kHz and 6.67kHz

Frequency Response Gain and Phase Over Frequency

4Ω Load

Intermodulation Distortion (SMPTE) vs Power – 60Hz and 7kHz

Orchard Audio LLC

51 Google reviews

Orchard Audio LLC

51 Google reviews

E Lins

2024-02-12

Friendly place, honest and knowledgeable guy. Direct and frank exchange, business-driven up-to-the-point purchases.

Wing Ng

2024-02-11

Leo was great to deal with and responsive in working with me to make sure I was satisfied with his amp.

Robert Audet

2023-07-18

If Leo was a DAC, he'd be top of the line for sure. Few years back when I first heard of Orchard Audio, checked their initial product which was right up their with this new trend of SBCs out of the UK which made robotic learning for kids the new hype, as well as low cost, high quality devices for men and their guilty pleasure, the SOUND. What made it very interesting is that in the world of RaspberryPi, HifiBerry and so many others, you had this company who's owner and creator was a rock star among us men. Everyone was talking about Leo this and Leo that. The product reviews, although always among the most recommended, still came after all the praise for Leo. Yesterday I got my Orchard-Audio PecanPi Streamer from a private vendor. The unit was 2nd hand, it arrived in a box with nothing else but a note: Enjoy the music. Of course nothing worked as I had hoped it would and I was left with no other choice but to contact the company for HELP! I got on a chat line with someone at the company and that person soon discovered that we were both talking different languages and where could not even described my new purchase correctly. Well lucky for me, that person did not give up on me, he tried one thing, and then another, and this went on until we hit a key word that brought us together on the same page, with a sudden clear understanding of what I had to do. 45min. that's all it took after that for me to get my new PecanPi Streamer connected, with a new SD card in and a fresh configuration. That was the moment when music started playing, not any kind of music, but for me at least, the MUSIC that I as a man have been evolving to. I have now reached plenitude and am now ready to die if I must, but before, please let me listen to that music a little while longer. Oh!, did I mention that the poor sole at the end of the chat, the one who walked me through Dante's Inferno, well, yeah it was indeed...Leo. Leo thanks for the MUSIC and for being you. Robert Audet

Robert A Rust

2023-07-01

Leo, after our discussion at the Florida International Audio Fest, I am so glad that you built a three channel amplifier, the Duo/Trio. Just having a single power cord to get your amplification over three mono amps with power supplies and power cords is a great help. More importantly, it goes extremely well with my tube amplifier used for my front speakers. I think the GanFet class D works well for the other three speakers because it matches closely to the power rating of the tube amp, adds clarity to the center channel, and balances the frequency in the rear speakers, without competing with the front speaker pair. I also think that the use of the RCA to XLR converters are important to use instead of XLR to RCA cables. The increase of 6 dB improves the sound and allows the Duo/Trio to work optimally. Why buy an amplifier and then not use it to its full capacity? Anyone who wants to purchase this three channel amp, or any other of your amps, should seriously consider adding these converters to their system. To this point, I like the converters so much that I am ordering a third for my tube amplifier to insure that I am getting a fully balanced performance. Great job all around, thank you for taking the plunge. I hope this amplifier helps all of those people looking to upgrade their amplifiers using an Audio Video Receiver or processor, including those with tube front channels.

Ronald Hale

2023-06-16

Leo is awesome! He is the owner. Very quick shipping! Great product! And great customer service. I have asked way too many questions. And he always answers the same day.

Dominic Rushe

2023-04-25

TL/DR: Sounds amazing. Extraordinary customer service. Highly recommended. I have wanted to add a streamer to my hifi for a while - Rega Brio, KEF LS50s, CD and record player. But which one and what sort? Roon? Sonos? Bluetooth? WiFi? I went down the rabbit hole of reviews and forums. I am not a technophobe by any means but a lot of the info I found was too technical and confusing. I just wanted a plug and play streamer for Tidal and was thinking of getting an Audiolab 600N. I didn’t want to spend too much as the tech seems to be advancing. Then I read a John Darko piece about Raspberry Pi streamers and thought that seemed like an elegant solution but one that was too much of a DIY project for me to do by myself. More Googling and I found Orchard Audio. Here’s a dude (Leo) in New Jersey with “decades of engineering expertise” at big companies making reasonably priced streamers that get great reviews. What’s not to like? I bought the PecanPi, it arrived really quickly. It’s small, sturdy and has a solid, homemade feel that I love. I couldn’t wait to try it out. I chose the Volumio option after discussion with Leo. Plugged it in and nothing. Ugh. I rebooted everything (all very IT Crowd). Nothing. So I emailed Leo. Ten minutes later he had emailed me back. Problem was fixed (turned out it was just some glitch in my internet) but it was clear to me that Leo was on the case if I had issues. So now it is up and running and it’s phenomenal. Hifi descriptions of sound are as impossible as wine reviews, it’s so subjective, one man’s blackberry and slate is another’s blueberry and tar. But for me the PecanPi (in my smallish NY apartment) is big, detailed, has a great, intimate, 3D feel and sounds as good playing Satie as it does the Oh Sees. Very happy customer. Thank you!

Jonathan

2023-03-29

I was looking for the best GAN based Class D amplifier I could and stumbled across some positive reviews of the Starkrimson Ultra Gan amplifier. My initial buying experience was atypical in that the amplifier wasn't able to deal with my 125vac due to it triggering the overvoltage circuit to cut off the amplifier. I'm not going to sugar coat it; I reacted a bit too hastily with my words g g and well in the end cooler heads prevailed and Leo agreed to put a better regulated replacement power supply and solved the problem for me. Right out of the gate this amp has a very deep punchy bottom end. The midrange drivers and AMT tweeters sound as good as I've ever heard them now. I'm glad I kept this amplifier as it offers so much better control over the bass with extremely natural sounding mids and high. I highly recommend you audition the Starkrimson Ultra before checking out other class D or Gan based amps

Michael Valentiner

2022-12-29

Orchard Audio Starkrimson Stereo Ultra Review Michael Valentiner A big thanks to Leo for the opportunity to evaluate the Orchard Audio Starkrimson Stereo Ultra amp. It is hard to add anything that hasn't been already said about this amp. It is detailed, dynamic, lively, has well defined bass, etc. Superlative in many aspects. Detailed, smooth, and bright. Musical notes are very articulate and distinct from one another. Great separation of musical instruments. Percussion instruments are rendered in great detail. I was hearing things I hadn't heard in the mix before.

Riley Leclerc

2022-11-26

These little monoblocks paired with the streamer as a pre-amp is the smallest footprint endgame stereo set up out there.

stuart cadman

2022-10-08

I bought a PecanPi 18 months ago yet Leo didn't hesitate to advise on solving a technical issue I ran into today. Top Man!

Starkrimson® Ultra (500W) Specs and Test Results Specifications

Specifications

Test Results

8Ω Load

4Ω Load

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