The STAX SRM-700T combines a low-noise dual-FET input stage with a 6SN7 vacuum-tube output stage, purpose-built for STAX PRO-bias electrostatic headphones.
Ships in USA
30 Day Returns
Free 1 or 2 Day
Authorized Retailer
Choose the SRM-700T when you want a dedicated desktop driver for STAX earspeakers with both RCA and XLR source connections. Its hybrid design adds a vacuum-tube output stage without requiring a separate headphone energizer.
The 6SN7 tube stage follows carefully matched low-noise FETs. STAX uses Vishay non-inductive winding resistors and WIMA film capacitors in the design.
Select the input that matches your source. The RCA parallel output provides an additional connection for an analog system.
Use the front-panel control for normal listening, or bypass it when an upstream component provides volume adjustment. Reduce the source volume before engaging bypass.
| Circuit | FET input / vacuum-tube output hybrid DC amplifier |
|---|---|
| Frequency Response | DCโ100kHz with one SR-009S |
| Gain | 60dB |
| Harmonic Distortion | 0.01% or less at 1kHz / 100Vrms output |
| Maximum Output Voltage | 340Vrms at 1kHz |
| Bias | STAX PRO, 580V |
| Input Impedance | 50kฮฉ RCA; 50kฮฉ ร 2 XLR |
| Inputs | One stereo RCA input; one stereo XLR input, switch-selectable |
| Parallel Output | RCA |
| Power Consumption | 54W |
| Dimensions (W ร H ร D) | 240 ร 103 ร 393mm, including protrusions |
| Weight | 5.7kg |
| Operating Conditions | 0โ35ยฐC; below 90% relative humidity, non-condensing |
| Finishes | Black or Silver |
Overall rating: 4.875 / 5 from 8 reviews.
Review topics: [].
"It sounds great pairing with my Stax L700MK2. Warmer than solid state amp but not losing details and precision. Bass is clean and punchy. First time buyer at HeadAmp. The service was excellent and they responded fast to my emails."
"I've been building up a STAX collection lately, all through HeadAmp, including their portable amp and DAC, ear speakers, in ear monitors, and the STAX stand alone ear speaker amplifier. Everything is just above and beyond all my expectations. STAX has become my favorite manufacturer of Top of the Line/Endgame audiophile components. Besides all that, the service at HeadAmp, especially dealing with Justin, has been spectacular thus far. Do not hesitate to ask him questions. He will respond quickly and be totally honest, never trying to upsell anything on the website."
"This is a very good amp. Only gave it 4 stars since I have heard this and the stax D50 for comparison. The 700T is better than the D50 overall. No doubt about it. To get the best out of the 700T use the balanced inputs. AND, bypass the internal volume control. This requires you to have an additional way to control the Volume( my Mytek Manhattan II has a headphone output with a great volume control). The Stax volume control shrinks the Soundstage both horizontally and vertically. Also, the low end gets a little softer and the highs seem to be a bit rolled off. To avoid all of this use a dac with a great volume control and enjoy the glorious electrostatic sound. Mostly listen to jazz, classical, rock and ambient music. no EDM at all. Feed is from a very good to great dac and you will be rewarded with great sound. FYI you need a Torx T5 for the top screws and T8 for the side screws to remove the cover and get to the tubes and fuses."
"Excellent sound. Very detailed with a deep sound stage. It really drives my Stax headphones with ease and grace."
"Three words - warm, smooth, detailed. If you enjoy the "tube sound", you will love this amplifier. Walks of and leaves my D10 in every way. Works especially well with acoustic music where it adds a level of "fullness" to the sound. Even pop music is raised a level in warmth. Pairs well with the SR-007MKII."
"Due to the unforeseen acquisition of a Stax SR-X9000, I needed an electrostatic amp I felt could drive them. I know a Blue Hawaii is an amazing choice, but I needed something else due to desk space constraints. Headamp was kind enough to allow me to demo different amp options, and the 700T was small enough for my space, yet was the best sounding to me. I’m not exactly sure if it’s the tubes, but the treble sounds much fuller compared to other options I tried.. This amp is being fed by an RME ADI-2 Dac fs and it sounds amazing. The build and finish of the unit is top notch; everything feels precise and quality controlled extremely well. This amp is a very solid choice and is definitely worth a try."
"I purchased the SRM-007T to go with SR-007 MK-2 headphones and am very pleased with the combination. Behind the amp is an RME ADI-2 DAC fed by Roon residing on a server. The DAC is connected over USB to the server. The service from HeadAmp was excellent, I ordered the amplifier and it arrived 2 business days later. Justin played a key role in facilitating the selection and post sale questions around service. Still ordering more stuff to fill in details."
"Everyone's listening habits and musical preferences are different. That's a given. If you like classical music and jazz with a clean, clear, full, and precise sound, you'll like this amplifier. Couple it with the STAX L700MK2 ear speakers. Whatever is there you will hear as you never did before. It will be like rediscovering your music all over again. Make sure you have a good CD player and quality interconnects to complete things. I found that leaving the volume at 10 o'clock is sufficient for most listening. It sounds rich and warm to my ears. If a recording is well engineered, it will sound better. If it isn't you can't run and hide from these headphones and this amp."
