SMSL H300 Headphone Amplifier User Manual

: June 12, 2024
: SMSL

Table of Contents

Safety Notes
Warranty Terms
Features
Speciﬁcations
Display Interface and Instructions
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H300
USER MANUAL SMSL H300 Headphone Amplifier

The contents of this manual may be changed with the edition, and are subject to change without notice
Ver 1.0

Safety Notes

Install this unit in a well ventilated, cool, dry, clean place-away from direct sunlight, heat sources, vibration, dust, moisture, or cold..
Use the voltage speciﬁed on this unit Only. Using this unit with a higher voltage than speciﬁed is dangerous and may cause ﬁre , damage to this unit, or personal injury. Our company will not be held responsible for any damage resulting from the use of this unit with a voltage other than that speciﬁed.
Do not attempt to modify or ﬁx this unit by yourself. Contact alesperson or customer service when any service is needed. The cabinet should never be opened for any reason.
When not planning to use this unit for long periods of time (i.e. when going on vacation), disconnect the power cable from the AC wall outlet.

Important note:
The product speciﬁcations and information mentioned in this manual are for reference only. The content of this manual is subject to change without notice.

Warranty Terms

The Term of Service
Foshan Shuangmusanlin Technology Co., Ltd promises to oﬀer good-quality products. If the product is broken in 7 days after purchasing when you use it normally, you can choose to send it back for return, replacement or repairing (only the product does not aﬀect the second sales can be returned ). Repairing for free in one year if you use it normally.
Date of purchase is in accordance with the date on invoice or receipt uesd by seller, and if you buy it on line, you can show the screenshot of trade.
If an inappropriate usage causes the unit damaged, the warranty will be void. As below.
All damages by inappropriate use, including using it under non-normal working environment or without following the instructions.
Dismantling, reﬁtting, repairing by user in private.
Causing damage by using some ﬁttings instead of the designative or accredited ones.
Cannot provide credible proof of purchase.
Sending it back to our company for repairing.
Contact your S.M.S.L Audio reseller for a return or replacement.

Features

Fully balanced design, 4 ultra-low distortion precision linear feedback circuit (PLFC)!
The distortion is as low as 0.00006%, and the A-WTD is as low as 133dB!
Each channel uses 32 low-noise op amps in parallel, a total of 64 op amps for power ampliﬁer!
High output power, 16 ohm output power up to 10W, 32 ohms up to 5W;
The specially designed volume potentiometer greatly reduces channel deviation;
3 gears gain control, low gain is specially optimized for IEM;
Pre-out function, can be used as Hi-End pre-amp;
Vintage operation of mechanical toggle switches;
Ultra-compact design, very suitable for desktop headphone system;
High-precision low-temperature drift resistance, performance is not aﬀected by temperature;
High-quality relay and non-impact sound design;
20Hz to 100kHz(-0.5dB) frequency response;
The headphone ampliﬁer has comprehensive protections such as DC, overvoltage, and overload protection;
Built-in high-eﬃciency and low-noise power system.

Speciﬁcations

Inputs………………………………………………………………….Balanced, Unbalanced
Headphone outputs………………….4.4mm Balanced , XLR 4 Pin , 6.35mm unbalanced
Pre-outputs……………………………………………………….Balanced, Unbalanced
Output Power:
16 Ω………………………………………………………………….10W x 2
32 Ω…………………………………………………………………….5W x 2
SNR………………………………………………………………………133dB
Dynamic Range……………………………………………………..133dB
THD+N…………………………………………………………….. -123dB, 0.00006% (1kHz, 32 Ω)
Input Impedance………………………………………………….. 47kΩ
AMP output Impedance…………………………………………..Near 0 Ω
Pre-output Impedance:
Balanced……………………………………………………………………44Ω
Unbalanced……………………………………………………………….22Ω
Frequency Response………………………………………….. 20Hz – 100kHz(-0.5dB)
Gain:
Unbalanced………… Low(-11.5dB) , Middle(0dB) , High(18.5dB)
Balanced…………………. Low(-6dB) , Middle(6dB) , High(24.5dB)
Power consumption(EN60065)…………………………………………<50 W
Size………………………………………………………………………..210X40X178mm(WxHxD)
Weight…………………………………………………………………….1.23kg

Speciﬁcations are subject to change without notice.

Display Interface and Instructions

SMSL H300 Headphone Amplifier - Display

1	Volume	8	Power switch
2	6.35mm headphone jack	9	XLR balanced input
3	4.4mm balanced headphone jack	10	RCA input
4	Balanced headphone jack	11	RCA Pre-output
5	Output selection	12	XLR Pre-output
6	Gain selection	13	Power AC input(AC100-240V)
7	Input selection

Note:

Please turn down the volume before connecting the headphones to avoid excessive volume damage to the headset.
According to the advice of health experts, do not listen to the headphones for a long time so as not aﬀect your hearing.
The indicator light turns orange after it is turned on. Flashing orange means the system has triggered protection.