TOPPING L50 Linear Headphone Amplifier User Manual
- June 3, 2024
- TOPPING
Table of Contents
TOPPING L50 Linear Headphone Amplifier
GRAPH
Thank you for purchasing linear headphone amplifier L50! L50 is a high performance linear headphone amplifier that supports balanced and single-ended inputs and single-ended outputs. It is equipped with two different types of headphone jacks and 3 gain settings. Now we recommend first to read this manual for you to correctly use all the functions of L50.
Contents list
| L50 | X 1 |
|---|---|
| AC adapter | X 1 |
| 6.35mm to 3.5mm adaptor | X 1 |
| User manual | X 1 |
| Warranty card | X 1 |
Note: You can download the user manual on http://www.topping.audio/
Description
- Power indicator The light will be always on when the L50 is turning on, and goes off when it is turning off, blinks to indicate unexpected output.
- Input switch Switch to SE input/ BAL input, or turn off
- Gain switch H / M / L respectively corresponds to 14dB / OdB / -14dB
- 4-PIN-XLR headphone output jack Suitable for headphones with 4-PIN-XLRjack
- 6.35mm headphone output jack Suitable for headphones with 6.35mm jack
- Volume knob Used to adjust the volume. It is recommended to turn down the volume before playing music.
- Right channel 6.35mm TRS Balanced input
- Left channel 6.35mm TRS Balanced input
- Left channel single-ended RCA input
- Right channel single-ended RCA input
- Left channel single-ended RCA passthrough output
- Right channel single-ended RCA passthrough output
- Right channel 6.35mm TRS Balanced passthrough output
- Left channel 6.35mm TRS Balanced passthrough output
- Firmware upgrade interface This interface is for firmware upgrade only
- Power input AC15V/1 A 50Hz/60Hz
Note: The rear panel outputs are input passthrough when the unit is off and are off when the unit is on.
| TRS In| RCA In
---|---|---
Headphone Out| RCA Out| TRS Out| Headph o ne Out| RCA Out| TRS
Out
When t urn-on| ✓| ✕| ✕| ✓| ✕| ✕
Whe n t um – o ff| ✕| ✕| ✓| ✕| ✓| ✕
Product specifications
| Dimension n | 16. 6cm x 1 2.9cm x 4.1cm |
|---|---|
| Weigh t | 545g |
| Power | 1SVAC /1A 50Hz/60Hz@DC base 5.5*2.5 |
| Gain | L/M/H |
| Amplifier inputs | 1 x BAL |
1 x SE
Headphone Amplifier outputs| 1 x 6.35mm headphone output jack
1 x 4-PIN-XLR headphone output jack
Pre-amplifier outputs| 1 x BAL
1 x SE
Power consumption| <7.5W
L50 Headphone Amplifier specifications
| SE IN| BALIN
THD+N@1kHz (A-wt)| <0.00006% @ Output=780mW(32Ω)| <0.00006% @Output=780mW(32Ω)
<0.00006% @ Output=333mW(300Ω)| <0.00006% @Output=333mW (300Ω)
THO 20-20kHz (90kBW)| <0.00008% @ Output=780mW(32Ω)| <0.0001% @Output=780mW (
32Ω)
<0.00008% @Output =76mW( 300Ω )| <0.0001% @ Output=76mW(300Ω)
SNR MAX OUT 1kHz (A-wt)| 145dB| 140dB
SNR 50mV OUT 1kHz| 104dB| 104dB
Dynamic Range 1kHt ( A-wt)| 145d8| 140dB
Frequency Response| 20Hz-40kHz (±0.05d8)| 20Hz-40kHz (±0.1d8)
Output Level| 35Vpp@G=L| 6.6Vpp@G=L
35Vpp@G=M| 35Vpp@G=M
37Vpp@G=H| 37Vpp@G=H
AP measured nois, le vel ( A-wt)| <0.7uVrms @G=L| <0.7uVrms @G=L
<0.7uVrms @G=M| <0.7uVrms @G=M
<1.2 uVrms @G=H| <1.2 uVrms @G=H
Actual noise l evel* ( A-wt)| <0.3uVrms @G=L| <0.3uVrms @G=L
<0.3uVrms @G=M| <0.3uVrms @G=M
<1.0uVrms @G=H| <1.1uVrms@G=H
Channel Cross talk@1kHz| -119dB| -113d8
Input sensitivity| 60Vrms @G=L| 12.7Vrms @G=L
12Vrms @G=M| 12Vrms @G=M
2.7Vrms @G=H| 2.7Vrms @G=H
Gain| -14.3d8 @G=L| -14.5d8 @G=L
-0.1d8 @G=M| -0.3d8 @G=M
13.9d8 @G=H| 13.7d8 @G=H
Output Impedance| < 0.10| < 0.10
Output Power| 3400mW x 2 @160 THD+N<0.1%
2800mW x 2 @320 THD+N<0.1%
2000mW x 2 @640 THD+N<0.1%
540mW x 2 @3000 THD+N<0.1%
290mW x 2 @6000 THD+N<0.1%
Adapter Impedance| >80
- Note : The actual noise level is obtained by boosting the noise of L50 by 40dB using a low noise amplifier in front of the APx555B then dividing the measured noise by 100 times.
Precautions for daily use
- The output jacks shall not be grounded or short-circuited
- Do not keep the unit in a hot, humid environment or hit the unit strongly.
- Opening the case instantly voids the warranty!
- Indoor use only.