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TOPPING L70 Balanced NFCA Headphone Amplifier / Preamplifier Silver
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Topping L70
Balanced NFCA Headphone Amplifier / Preamplifier Silver
With the L70, Topping offers a highly engineered balanced NFCA headphone amplifier and preamplifier combo that delivers excellent sonic performance and is suitable for a wide range of use scenarios. Whether you are using demanding headphones, high sensitivity IEMs, or pairing with a power amplifier, the L70 is the ideal ally for pure, rich, dynamic listening.
L70
L50
L30 II
A30 Pro
A90 Discrete
Structure
Balanced
Single-ended
Single-ended
Single-ended
Balanced
Amplifier
NFCA
NFCA
NFCA
NFCA
Discrete NFCA
Inputs
Single-ended + Balanced
Single-ended + Balanced
Single-ended
Single-ended + Balanced
Single-ended + Balanced
Outputs
Jack 6.35mm
Jack 4.4mm
XLR 4 pins
Jack 6.35mm
XLR 4 pins
Jack 6.35mm
Jack 6.35mm
Jack 4.4mm
XLR 4 pins
Jack 6.35mm
Jack 4.4 mm
XLR 4 pins
Preamplifier
Yes
No
Yes
No
Yes
Smart independent outputs
Yes
No
No
No
No
Bypass
No
Yes
No
Yes
No
Gain
Single-ended output : 0/13.8dB
Balanced output : 6/19.8dB
-14 / 0 / 14dB
-14 / 0 / 16.5dB
-14 / 0 / 14dB
Single-ended output : 0/9.5dB
Balanced output : 6/15.5dB
Single-ended output power
2* 3500mW (16 Ohm)
2* 3400mW (16 Ohm)
2* 3500mW (16 Ohm)
2* 6000mW (16 Ohm)
Puissance symétrique
2* 6000mW (16 Ohm)
-
-
-
Impédance sortie asymétrique
< 0.1 Ohm
< 0.1 Ohm
< 0.1 Ohm
< 0.1 Ohm
High performance NFCA amplifier modules
The L70 uses the same NFCA (Nested Feedback Composite Amplifier) module as the A90. Its hybrid voltage/current feedback architecture combined with UHGF (Ultra High Gain Feedback) technology offers excellent DC and AC performance, extremely low THD+N and an incredibly high dynamic range of 146dB. In addition, the L70 has a high output current and a very low output impedance and noise level, allowing it to drive the vast majority of headphones on the market, including the most demanding models.
Multiple headphone outputs
The L70 is compatible with most headphone connectors. It integrates a balanced XLR 4 pins, a balanced 4.4mm jack and an single-ended 6.35mm jack. The on-board balanced amplifier circuitry is suitable for both balanced and single-ended headphones. In addition, its high output voltage and current as well as its low output impedance allow it to accompany sensitive headphones and high-impedance headphones without difficulty.
Two levels of gain
The Topping L70 provides two levels of gain to cover most needs of different headphones.
Single-ended output : Low gain : 6.0dB / High gain : 19.8dB
Balanced output : Low gain : 0dB / High gain : 13.8dB
Preamplifier function
The L70 is not only capable of driving headphones but can also be used as a preamplifier. In this mode you get the same performance as with the headphone amplifier and the single-ended 20Ω and balanced 40Ω output impedances allow compatibility with many amplifiers. In addition, the L70 comes with a remote control for convenient control.
Custom volume control
Using an R2R volume control composed of relays and a resistor network, the L70 ensures a precise adjustment, a great durability and a perfect balancing of the channels. It also incorporates a memory for the volume and gain level according to 8 profiles that can be customized according to the connected equipment.
Ground loop eliminator
A ground loop can occur when multiple devices are used together. The L70 has a GND/LIFT switch to solve this problem. In normal use, simply set it to the GND position. When a ground loop is encountered, select LIFT mode to eliminate the ground loop.
12V Trigger
The L70 integrates a 12V trigger with active (trigger output) and passive (trigger input) control. With only a simple 3.5mm jack cable, the Topping L70 can be switched on and off in sync with your other equipment with a 12V trigger interface.
| 1 | ON-OFF / Input selector button |
| 2 | Balanced XLR 4 pins headphone output |
| 3 | Balanced Jack 4.4mm headphone output |
| 4 | Single-ended Jack 6.35mm headphone output |
| 5 | Volume button |
| 6 | Single-ended stereo XLR / Jack 6.35mm combo input |
| 7 | Single-ended stereo RCA input |
| 8 | Single-ended stereo RCA output |
| 9 | Balanced stereo XLR output |
| 10 | 12V Trigger input |
| 11 | 12V Trigger output |
| 12 | Ground loop elimination switch |
| 13 | Firmware update port |
| 14 | Power connector |
| 15 | Power switch |
Technical characteristics
| Specifications | |
|---|---|
| Product type | Headphone amplifier Preamplifier |
| Inputs | 1x Balanced stereo Jack 6.35mm / XLR combo 1x Single-ended stereo RCA |
| Outputs | 1x Balanced stereo XLR 1x Single-ended stereo RCA 1x Balanced XLR 4 pins headphone output 1x Balanced Jack 4.4mm headphone output 1x Single-ended Jack 6.35mm headphone output |
| Amplifier | NFCA |
| Headphone amplifier measurements | ||||
|---|---|---|---|---|
| SE IN / SE OUT | BAL IN / SE OUT | SE IN / BAL OUT | BAL IN / BAL OUT | |
| THD+N @ 1kHz (A-wt) | < 0.00006% @ 500mW, 32Ω < 0.000055% @ 80mW, 300Ω | < 0.00007% @ 500mW, 32Ω < 0.000065% @ 80mW, 300Ω | < 0.00006% @ 2000mW, 32Ω < 0.000055% @ 320mW, 300Ω | < 0.00007% @ 2000mW, 32Ω < 0.000065% @ 320mW, 300Ω |
| THD @ 20Hz-20kHz (90kBw) | < 0.00008% @ 500mW, 32Ω < 0.00007% @ 80mW, 300Ω | < 0.00015% @ 500mW, 32Ω < 0.00015% @ 80mW, 300Ω | < 0.00009% @ 2000mW, 32Ω < 0.00008% @ 320mW, 300Ω | < 0.0002% @ 2000mW, 32Ω < 0.00015% @ 320mW, 300Ω |
| SNR @ Max Out, 1kHz (A-wt) | 143dB | 138dB | 146dB | 139dB |
| Dynamic range @ 1kHz (A-wt) | 143dB | 138dB | 146dB | 139dB |
| Frequency response | 10Hz-100kHz (±0.1dB) | 10Hz-100kHz (±0.5dB) | 10Hz-100kHz (±0.1dB) | 10Hz-100kHz (±0.5dB) |
| Output level | 26vpp | 26Vpp | 52Vpp | 52Vpp |
| AP Measured noise level (A-wt) | < 0.7µVrms @ G=L < 1.2µVrms @ G=H | < 0.7µVrms @ G=L < 1.2µVrms @ G=H | < 0.9µVrms @ G=L < 2.2µVrms @ G=H | < 0.9µVrms @ G=L < 2.2µVrms @ G=H |
| Effective noise level* (A-wt) | < 0.3µVrms @ G=L < 1.1µVrms @ G=H | < 0.3µVrms @ G=L < 1.1µVrms @ G=H | < 0.7µVrms @ G=L < 2.2µVrms @ G=H | < 0.4µVrms @ G=L < 2.2µVrms @ G=H |
| Crosstalk @ 1kHz | -104dB | -104dB | -120dB | -120dB |
| Input sensitivity | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H |
| Gain | 0dB @ G=L 13.8dB @ G=H | 0dB @ G=L 13.8dB @ G=H | 6dB @ G=L 19.8dB @ G=H | 6dB @ G=L 19.8dB @ G=H |
| Output impedance | < 0.1Ω | < 0.1Ω | < 0.2Ω | < 0.2Ω |
| Output power | 2* 3500mW @ 16Ω, THD+N < 0.1% 2* 2300mW @ 32Ω, THD+N < 0.1% 2* 1200mW @ 64Ω, THD+N < 0.1% 2* 290mW @ 300Ω, THD+N < 0.1% | 2* 6000mW @ 16Ω, THD+N < 0.1% 2* 7500mW @ 32Ω, THD+N < 0.1% 2* 4700mW @ 64Ω, THD+N < 0.1% 2* 1150mW @ 300Ω, THD+N < 0.1% 2* 600mW @ 600Ω, THD+N < 0.1% | ||
| Load impedance | > 8Ω | |||
| Preamplifier measurements | ||||
|---|---|---|---|---|
| SE IN / SE OUT | BAL IN / SE OUT | SE IN / BAL OUT | BAL IN / BAL OUT | |
| THD+N @ 1kHz (A-wt) | < 0.000055% | < 0.00006% | < 0.000055% | < 0.00006% |
| THD @ 20Hz-20kHz (90kBw) | < 0.00007% | < 0.00015% | < 0.00008% | < 0.00015% |
| SNR @ 1kHz (A-wt) | 143dB | 138dB | 146dB | 139dB |
| Dynamic range @ 1kHz (A-wt) | 143dB | 138dB | 146dB | 139dB |
| Frequency response | 10Hz-100kHz (±0.1dB) | 10Hz-100kHz (±0.5dB) | 10Hz-100kHz (±0.1dB) | 10Hz-100kHz (±0.5dB) |
| Output level | 26vpp | 26Vpp | 52Vpp | 52Vpp |
| AP Measured noise level (A-wt) | < 0.7µVrms @ G=L < 1.2µVrms @ G=H | < 0.7µVrms @ G=L < 1.2µVrms @ G=H | < 0.9µVrms @ G=L < 2.2µVrms @ G=H | < 0.9µVrms @ G=L < 2.2µVrms @ G=H |
| Effective noise level* (A-wt) | < 0.3µVrms @ G=L < 1.1µVrms @ G=H | < 0.3µVrms @ G=L < 1.1µVrms @ G=H | < 0.7µVrms @ G=L < 2.2µVrms @ G=H | < 0.4µVrms @ G=L < 2.2µVrms @ G=H |
| Crosstalk @ 1kHz | -104dB | -104dB | -120dB | -120dB |
| Input sensitivity | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H | 9.6Vrms @ G=L 1.9Vrms @ G=H |
| Gain | 0dB @ G=L 13.8dB @ G=H | 0dB @ G=L 13.8dB @ G=H | 6dB @ G=L 19.8dB @ G=H | 6dB @ G=L 19.8dB @ G=H |
| Output impedance | 20Ω | 20Ω | 40Ω | 40Ω |
| General | |
|---|---|
| Color | Silver |
| Dimensions | 200*138*44mm |
| Package | 1x Topping L70 1x Remote control 1x Jack 6.35mm to Jack 3.5mm adapter 1x Power cable |
| Input | RCA |
| Input | XLR |
| Input | Jack 6.35mm |
| Output | RCA |
| Output | Jack 6.35mm |
| Output | XLR |
| Output | Jack 4.4mm |
| Color | Silver |
| Class | Class D / T |
| Remote Control | Yes |
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