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Stax - International SRM-T8000 Driver unit for Earspeakers
- The SRM-T8000 is an exclusive driver unit (power amplifier) with 4-input selector developed in order to ideally drive STAX electrostatic earspeakers.
- The unit incorporates a high-quality double-axis 4-gang volume controller along with XLR connectors that can connect to all kinds of analog line-level output terminals.
- The hybrid amplifier configuration with strictly selected low-noise 6922 dual triode tube for the first stage and high-current emitter-follower at output stage brings out the maximum performance of earspeakers. Its natural un-colored sound has been realized by eliminating the coupling capacitor that affects sound
- The balanced amplifier configuration with low-noise dual triode tube eliminated transformer or inverting amplifier after the XLR balanced input terminal.
- Non-magnetic chassis construction is employed, and only the carefully selected electronic components free from aged deterioration are used taking both their sonic quality and performance into consideration.
- The SRM-T8000 is equipped with "direct mode" function, enabling it to connect to preamplifier output terminal or to use your favorite Also, two RCA inputs and XLR balanced input can bypass the incorporated volume controller (Line 4 input does not have this function).
- Optional extension slot (LINE4) is provided for future use. Refer to the instruction manual of this optional card.
- The foot rubber of the SRM-T8000 features fire-resistant ultra-hard high-grip type and vibration-proof properties. So the unit hardly slides when placed on a table etc. Please lift it up when you move it.
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Stax SRM-T8000 Driver unit for Earspeakers
Stax's SRM-T8000 is an energiser built to deliver exceptional midrange detail and a remarkably quiet background, making it ideal for high-resolution electrostatic earspeakers. Its hybrid topology pairs screened 6922 tube inputs with a solid-state output stage and a large toroidal transformer on a non-magnetic aluminium chassis to minimize microphony and noise. The result is precise, highly resolved imaging, superb retrieval of string timbre and a frequency extension to 115kHz, though dynamics favor refinement over raw slam. Connectivity includes balanced (XLR) and single-ended (RCA) inputs and Stax PRO bias outputs; balanced feeding is noted to sound best. Owners of flagship Stax earspeakers such as the SR-009 will find the T8000 an authoritative match. Alan Sircom at hi-fi+ praised its resolution and engineering.
Pros
- Exceptionally detailed midrange and imaging that retrieves fine string timbre and stereo cues.
- Very low noise floor and well-engineered anti-microphony measures (screened/damped valves, isolated valve PCB, anti-vibration feet, toroidal transformer).
- Robust hybrid construction—screened 6922 tube input stage with solid-state output and large toroidal transformer—delivers authoritative build quality and control.
&
Cons
- Dynamics prioritize refinement over visceral slam; less immediate 'meatier' punch than some aftermarket alternatives.
- Valve cans limit tube-rolling options for users who enjoy swapping tubes.
Sound Quality
84/100
Review praises authority and control but explicitly notes the T8000 is only ‘good’ on sheer visceral punch and that there are aftermarket devices that sound more immediately dynamic and 'meatier'. It has solid headroom and does not sound weak, but dynamics are not its top strength compared with competitors aimed at slam and raw punch.
Noise Floor
90/100
Although a tube-equipped energiser, the review documents multiple anti-noise measures (screened/damped valves, isolated valve PCB, internally shielded volume pot, anti-vibration feet and a large toroidal transformer on a non-magnetic chassis) and describes a listening experience of “just you and the music with seemingly nothing in the way.” That language supports a very quiet, near-black-background performance for electrostatic earspeakers; the valve stages appear well engineered to avoid audible hiss or microphony, so the Noise_Floor is rated very highly while acknowledging the typical tube trade-off has been mitigated by Stax's mechanical and electrical measures.
Headphone Compatibility
78/100
This unit is purpose-built for Stax electrostatic earspeakers (Stax PRO bias outputs ×2) and offers balanced and single-ended analogue inputs, but it is not a universal headphone amp for dynamics/planars. While it provides the correct bias, voltage and power for Stax earspeakers (including very high-voltage capability), its usefulness outside electrostatic systems is limited, which constrains the compatibility score.
Build Quality
92/100
Reviewer details strong engineering choices: isolated valve circuit board, screened and damped valves, internally shielded volume pot, anti-vibration feet and a large toroidal transformer in a non-magnetic aluminium chassis. These design choices and the overall execution justify a top-tier build-quality score.
Features Connectivity
85/100
Baseline features include RCA ×2 and XLR ×1 analogue inputs (review notes balanced sounds best) and Stax PRO bias outputs ×2. The unit also has PARALLEL OUT, an optional slot, volume bypass and mute functions. Starting from the 80 baseline, the presence of balanced input(s), multiple Stax outputs and parallel output yields a well-equipped but specialized feature set appropriate to its class.
Value for Money
86/100
Price cited by the review (£4,395 / $5,800) and by product data (~6,090 in the provided range) places this in a high-end niche segment. The review praises it as Stax's best energiser and a top choice for detail, but does not explicitly call out 'excellent value' or 'overpriced'—so the assessment is a neutral-to-favorable contextual value judgement relative to its niche peers.
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