What is the warranty? How do I claim it?

All STAX products come with a 1 year warranty. You can simply get in touch with us to claim the warranty. Click here.

What sort of device is the STAX SRM-400S?

The STAX SRM-400S is a driver unit. A driver unit is like an amplifier. It converts electrical signals from your audio player into music when it reaches your headphones. It is mainly used for headphones and earphones that have a high impedance. Find out more here .

What else do I get in the box?

Along with the STAX SRM-400S you get Power Cable, RCA Cable, Warranty Card and User's Manual in the box.

STAX

STAX - SRM-400S

Name: STAX - SRM-400S
Brand: STAX
SKU: STAX - SRM-400S
Price: 97999.00 INR
Availability: InStock

Electrostatic Energiser For STAX Headphones

₹ 97,999

MRP: ₹ 118,990

GET 18% GST INPUT

One of the reasons headphones and earphones in India are more expensive than overseas is because of the Goods & Services Tax in India.

Don't let the GST input go to waste especially if you can avail an offset.

All products sold on Headphone Zone carry a GST compliant invoice and all products sold include an 18% GST.

Simply enter your GST number at the time of checkout.

Browse EMI Plans

Low Cost EMI Options through Credit Cards

ICICI Bank

Tenure Interest% Installment Interest

Low Cost EMI

₹ 33,541

~~₹ 2,623~~ ₹ 2,114

Low Cost EMI

₹ 17,103

~~₹ 4,621~~ ₹ 3,739

15.99%

₹ 11,627

₹ 6,644

15.99%

₹ 8,891

₹ 8,694

15.99%

₹ 6,159

₹ 12,870

15.99%

₹ 4,798

₹ 17,150

HDFC Bank

Tenure Interest% Installment Interest

Low Cost EMI

₹ 33,541

~~₹ 2,625~~ ₹ 2,114

Low Cost EMI

₹ 17,104

~~₹ 4,624~~ ₹ 3,739

16%

₹ 11,628

₹ 6,649

16%

₹ 8,892

₹ 8,699

16%

₹ 6,160

₹ 12,879

16%

₹ 4,798

₹ 17,161

SBI Bank

Tenure Interest% Installment Interest

Low Cost EMI

₹ 33,569

~~₹ 2,707~~ ₹ 2,177

Low Cost EMI

₹ 17,055

~~₹ 4,332~~ ₹ 3,488

15%

₹ 11,581

₹ 6,226

15%

₹ 8,845

₹ 8,144

16%

₹ 6,160

₹ 12,879

16%

₹ 4,798

₹ 17,161

Axis Bank

Tenure Interest% Installment Interest

Low Cost EMI

₹ 33,541

~~₹ 2,625~~ ₹ 2,114

Low Cost EMI

₹ 17,104

~~₹ 4,624~~ ₹ 3,739

16%

₹ 11,628

₹ 6,649

16%

₹ 8,799

₹ 7,590

16%

₹ 6,160

₹ 12,879

16%

₹ 4,798

₹ 17,161

Other EMI Options through Credit Cards

Citi Bank

Tenure Interest% Installment Interest

14%

₹ 33,431

₹ 2,295

14%

₹ 17,007

₹ 4,040

16%

₹ 11,628

₹ 6,649

16%

₹ 8,892

₹ 8,699

16%

₹ 6,160

₹ 12,879

16%

₹ 4,798

₹ 17,161

Kotak Mahindra Bank

Tenure

Interest%

Installment

Interest

16%

₹ 33,541

₹ 2,625

16%

₹ 17,104

₹ 4,624

16%

₹ 11,628

₹ 6,649

16%

₹ 8,892

₹ 8,699

16%

₹ 6,160

₹ 12,879

16%

₹ 4,798

₹ 17,161

RBL Bank

Tenure Interest% Installment Interest

13%

₹ 33,377

₹ 2,131

14%

₹ 17,007

₹ 4,040

15%

₹ 11,581

₹ 6,226

15%

₹ 8,845

₹ 8,144

15%

₹ 6,114

₹ 12,047

15%

₹ 4,752

₹ 16,040

Standard Chartered Bank

Tenure Interest% Installment Interest

13%

₹ 33,377

₹ 2,131

13%

₹ 16,958

₹ 3,749

14%

₹ 11,534

₹ 5,805

14%

₹ 8,799

₹ 7,590

INDUSIND Bank

Tenure Interest% Installment Interest

14%

₹ 33,431

₹ 2,295

14%

₹ 17,007

₹ 4,040

15%

₹ 11,581

₹ 6,226

15%

₹ 8,845

₹ 8,144

15%

₹ 6,114

₹ 12,047

15%

₹ 4,752

₹ 16,040

HSBC Bank

Tenure Interest% Installment Interest

12.50%

₹ 33,349

₹ 2,049

12.50%

₹ 16,934

₹ 3,604

13.50%

₹ 11,510

₹ 5,595

13.50%

₹ 8,776

₹ 7,313

13.50%

₹ 6,045

₹ 10,805

YES Bank

Tenure Interest% Installment Interest

13%

₹ 33,377

₹ 2,131

13%

₹ 16,958

₹ 3,749

14%

₹ 11,534

₹ 5,805

14%

₹ 8,799

₹ 7,590

15%

₹ 6,114

₹ 12,047

15%

₹ 4,752

₹ 16,040

Bank of Baroda

Tenure Interest% Installment Interest

13%

₹ 33,377

₹ 2,131

14%

₹ 17,007

₹ 4,040

14%

₹ 11,534

₹ 5,805

15%

₹ 8,845

₹ 8,144

15%

₹ 6,114

₹ 12,047

16%

₹ 4,798

₹ 17,161

American Express

Tenure Interest% Installment Interest

14%

₹ 33,431

₹ 2,295

14%

₹ 17,007

₹ 4,040

14%

₹ 11,534

₹ 5,805

14%

₹ 8,799

₹ 7,590

15%

₹ 6,114

₹ 12,047

15%

₹ 4,752

₹ 16,040

Talk to a Headphone Guru

DELIVERY

Dispatches in 24-48 Hours

What does "ships within 24/48 hours" mean?

In a nutshell, ships within 24/48 hours basically means that your product will be shipped out or dispatched from our warehouse within 24/48 hours after placing the order. It also indicates that the products are readily available at our warehouse and once we receive your order, we dispatch it out at the earliest either on the same day or the next working day depending on when you’ve placed your order.

What it does not mean:

A lot of our customers assume that it means their order will get delivered to them within 24/48 hours, but that’s not what it means. For an order to reach you, it can take anywhere up to 3-4 business days, depending on which part of India you are placing an order from.

For an accurate timeline, you can enter your pin code on the product page and check for an estimated date of arrival.

Delivery By:

RETURNS & WARRANTY

7 Day Replacement Guarantee

In case you receive the STAX - SRM-400S with a manufacturing defect, please raise a return request within 7 days of delivery.

However, if you receive an incorrect / damaged / different product or one with missing accessories, please raise a return request within 24 hours of delivery. In case you receive a product with a missing, incorrect, or faulty accessory, you will be given a replacement accessory instead of the entire product.

Please make sure that the product is in the original packaging with all the accessories it came with. We'll also need an unboxing video and images of the parcel to investigate about the discrepancy. You may be asked to share images of the product and the packaging received for us to determine the damage or defect prior to approving the return request. The free replacement will be shipped only once the original order is returned.

A replacement will be issued only if:

- It is found to be defective
- It is determined that the product was not damaged while in your possession
- The product is not different from what was shipped to you
- The product is returned in original condition (with brand’s/manufacturer's box, MRP tag intact, user manual, warranty card and all the accessories therein)

1 Year Warranty

Warranty & Services

Don't sweat it, this STAX - SRM-400S comes with a 1 Year warranty from STAX that covers manufacturing defects. All products featured on Headphone Zone are backed by an original manufacturer's warranty.

Read more about STAX's warranty in India.

Club Audiophile

Join Club Audiophile to begin your pursuit of great sound. Earn points and save on every purchase.

READ MORE

STAX STAX - SRM-400S

₹ 97,999

MRP: ₹ 118,990

Designed in
Japan

1 Year of
Warranty

Ideal for Audiophiles

These DAC & Amps are designed for discerning music lovers. If audio quality is important to you, a set of DAC & Amps like these would be ideal.

You can expect these DAC & Amps to present you with a refined listening experience. The audio quality exhibited by these DAC & Amps is a beautiful mix of musicality, technical brilliance and high precision.

These DAC & Amps deliver a spacious & open soundstage that makes you feel you are sitting at a live concert. Experience the magic and delve into pure sonic tranquility!

Ideal for
Indoor Use

Connect With
3-Pin XLR & RCA

Metal
Build

Volume Controls

If your DAC & Amps include volume controls or volume rockers, you can easily change the volume with a button press or volume knob turn.

DAC & Amps that have volume controls make its operation incredibly simple; turn up the volume on your smartphone or your source devices and then change the volume on DAC & Amps to the desired level.

This design feature allows you to have complete control over the desired volume according to your listening preferences.

DESCRIPTION

STAX introduces a new semiconductor driver unit SRM-400S, the successor model of SRM-353X. The solid-state amplifier, SRM-400S, exhibits remarkable versatility and excellence. Your appreciation will grow as you progress with your listening session. STAX introduces a new semiconductor driver unit SRM-400S embedded with STAX custom-made low noise DUAL FET installed on First Stage with a FET also installed on Last Stage. The characteristics of right FET and left FET are measured strictly. SRM-400S is an amplifier with FET installed in all stages. In addition to the conventional power transformer for the high voltage circuit, the newly designed power transformer with the winding for the low voltage circuit is installed in SRM-400S. The low voltage winding improves the power efficiency and achieves further power saving and better sound quality than the conventional driver units. The complete DC amplifier configuration of the signal circuit includes no coupling condensers.

SRM-400S amplifies the analog signal from the input with as little fuss and distortion as possible. SRM-400S is a promising new model with a renewed driver unit lineup with each range well harmonized from the low to high. SRM-400S does justice across the frequency spectrum with greater precision. It is a rock-solid performer that deserves the attention of anyone who’s looking for an electrostatic headphone amplifier capable of driving high-end earspeakers. Its sound is undistorted, sparkly, and exciting. SRM-400S has an impressively wide soundstage delivering full-range sound.

Experience full visual glory with the all-new chassis that is more rigid than the conventional models. The chassis has a hybrid structure using a lot of non-magnetic aluminum and further reduces the effect of the environmental noise factors such as vibrations. SRM-400S is embedded with a custom-made concentric dual volume knob and RCA parallel out functions. As for the aesthetics, you will find the understated elegance and simplicity of SRM-400S extremely attractive. The front and the back conform to the familiar Stax design architecture. Not needed to mention

STAX SRM-400S is available in Black finish with a silver faceplate featuring improvements in the output stage, chassis design, power transformer, and overall performance. SRM-400S has a Frequency response of DC – 90kHz (with one SR-L500 MK2) and a Gain of 60dB with an Input impedance of 50kΩ. It has a maximum output voltage of 400v Rms (1kHz) with a Bias voltage of DC 580V and power consumption of 30W. SRM-400S comprises Input terminal RCA x 1, XLR x 1(mutual exclusion input), and an Output RCA parallel output terminal.

SPECS

SPECIFICATIONS

TYPE	All-stage FET configuration DC amplification driver unit
FREQUENCY RESPONSE	DC – 90kHz (with one SR-L500 MK2)
GAIN	60dB
HARMONIC DISTORTION	0.01% or less (1kHz/100Vrms output)
INPUT IMPEDANCE	50kΩ (RCA), 50kΩx 2 (XLR)
MAXIMUM OUTPUT VOLTAGE	400Vrms (1kHz)
BIAS VOLTAGE	DC 580V
OPERATING TEMPERATURE / HUMIDITY	0 to 35 degrees C / less than 90% (non condensing)
INPUT TERMINAL	RCA x 1, XLR x 1(mutual exclusion input)
OUTPUT	RCA parallel output terminal
POWER CONSUMPTION	30W
DIMENSIONS	195mm (W) x 102mm (H) x 376mm (D) (maximum protruding portion included)
WEIGHT	3.4kg

IN THE BOX

BOX CONTENTS	1. STAX SRM-400S
	2. Power Cable
	3. RCA Cable
	4. Warranty Card
	5. User's Manual

OTHER DETAILS

GENERIC NAME	Energiser
IMPORTER DETAILS	Importers Name: Ferrari Video Address: 63/18, 1st Main Road, Gandhi Nagar, Chennai - 600020 Contact No: 044-24420733
DIMENSIONS	195 x 102 x 376 mm
NET QUANTITY	1

MANUFACTURER DETAILS	Name: Edifier International Limited Address: Room 2101, 21st floor, The L. Plaza, 367-375 Queen's Road Central, Hong Kong
PACKAGE CONTENTS	STAX SRM-400S, Power Cable RCA Cable Warranty Card User's Manual

MANUALS & GUIDES

User Manual | SRM-400S

Electrostatic Energiser For STAX Headphones

FAQs

1 Year Warranty

Japanese Electrostatic Pioneers From 1938

Stax, founded in 1938, is a Japanese company that makes high-end audio equipment. Twenty-two years later, in 1960, Stax released their first electrostatic earspeaker, the Stax SR-1. Over the following thirty-six years, Stax produced a variety of amplification, earspeaker, tonearm, CD player, DAC, phono cartridge and loudspeaker products.

Stax is best known for its electrostatic and electret headphones, which they call earspeakers. Electrostatic headphones work similarly to electrostatic loudspeakers but on a smaller scale. In 1995, fifty-seven years after the company’s foundation, it became insolvent. The company was revived in 1996 as the new STAX company. In December 2011, Chinese loudspeaker manufacturer Edifier announced the acquisition of 100% equity in Stax.

Explore Collection

It's ok (for the price)

This is far too expensive for what it delivers. The tiny SRM-252s already gets you into this territory at a fraction of the cost. If the SRM-252s is an 'A', this is an 'A+' (barely).

You do get XLR inputs, though. There are also two earspeakers out. Why would there be such a thing, other than to compare and endlessly quibble about the performance of different types of earspeakers?

It is simply not good value.