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3E AUDIO A7 Class D Stereo Amplifier PBTL 2xTPA3255 2x250W 4 Ohm
Integrated amplifiers
Reference 20372
Bon à savoir
3E Audio, a recognized player in the DIY world, now offers a Class D Stereo amplifier incorporating audiophile Hi-Fi components. The A7 amplifier is based on two TI TPA3255 chips in PBTL configuration, and two dual OPA1612A OPAs. This means it can deliver up to 2x 250W into 4 ohm power.Including €0.05 for ecotax
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Ce qu'il fait
3E Audio A7 Class D Stereo Amplifier PBTL 2xTPA3255 2x250W 4 ohm
3E Audio, a recognized player in the DIY world, now offers a Class D Stereo amplifier incorporating audiophile Hi-Fi components. The A7 amplifier is based on two TI TPA3255 chips in PBTL configuration, and two dual OPA1612A OPAs. This means it can deliver up to 2x 250W into 4 ohm power.
In terms of connectors, the 3E Audio A7 features an RCA input, a practical balanced XLR/Jack 6.35mm combo input, and an output on speaker terminals. The RCA inputg gain can be adjusted (LOW=25dB, HIGH=28.5dB), and the preamplifier stage and volume control can be bypassed for use as a power amplifier. Versatile and high-performance, this little amplifier is able to offer a good reserve of power while preserving the final sound reproduction.
Product update
In response to feedback from the Audio Science Review community, 3E Audio has made a number of modifications to its amplifiers.
- Auto power off time set to 20 mins.
- Increase audio detection sensitivity RCA: 200uVrms; XLR: 400uVrms,this significantly meet some user listening in very very low volume.
- Auto audio sensing power on/off can be disable/enable by user. To do so, simply press and hold the 5 seconds volume button in standby mode, and the RCA LED will flash for 3 seconds to deactivate it. To reactivate, follow the same procedure, but the XLR LED flashes for 3 seconds.
A7
A7se
A7 Mono
A5se
A5
Amplification chip
2x TPA3255
2ch - PBTL
1x TPA3255
2ch - BTL
1x TPA3255
1ch - PBTL
1x TPA3251
2ch - BTL
2x TPA3251
2ch - PBTL
Output power
(4 ohm, THD+N=1%)
2x 250W
2x 230W
1x 260W
2x 140W
2x 150W
Output power
(8 ohm, THD+N=1%)
2x 140W
2x 130
1x 150
2x 70W
2x 80W
Load impedance
2-16 ohm
4-16 ohm
2-16 ohm
4-16 ohm
2-16 ohm
3E Audio A7: Two TPA3255 chips
The two TPA3255 amplifier chips offer a consistent level of output power, as the 3E Audio A7 delivers up to 2x250W into 4 ohm and up to 2x140W into 8 ohm (THD+N = 1%). In addition, the PBTL configuration maintains continuous, stable output power while reducing power losses. It also enables the amplifier to withstand loads of up to 2 ohms.
3E Audio A7: Interchangeable OPAs
The preamplifier stage of the 3E Audio A7 is made up of two double OPA1612A OPAs mounted in DIP 8 and easily replaceable with pliers, thanks to the design of the case. In fact, the OPAs can be accessed through two hatches without opening the case. Here's a non-exhaustive list of compatible OPAs: OPA1656, OPA1602, OPA2134, NE5532P, LME49720, LM4562, MUSES02, MUSES8920, NJM4580, NJM4556, NJM2068, OP249, AD827, etc.
Please take care not to damage the device or the OPAs when replacing or handling them. Any damage to the device caused by improper handling by the user (reverse mounting of OPAs, mounting of non-compatible OPAs, etc.) will invalidate the product warranty. Please refer to the manual to carry out the operation.
3E Audio A7: Quality components
Rubycon 63V 1000uF capacitors
Rubycon capacitors meet high current requirements, reducing noise and improving THD.
Flat-wire coils
The coils used in the amplifier provide improved linearity and reduced distortion, while delivering the best performance whatever the load.
TDK capacitors
These highly reliable LC filter capacitors ensure optimum audio performance.
3E Audio A7 overview
| 1 | Left channel status LED |
| 2 | RCA input status LED |
| 3 | Multifunction button |
| 4 | XLR input status LED |
| 5 | Right channel status LED |
| 6 | Balanced XLR/Jack 6.35mm combo input |
| 7 | RCA input |
| 8 | RCA gain control |
| 9 | Speaker terminal output |
| 10 | Volulme bypass |
| 11 | 38V-48V DC power supply via DC jack |
3E Audio A7/A7 Mono test by Audio Science Review
"If my memory serves me right, 3e audio was the first company to bring us high performance TI TPA3255 class D amplifiers with PFFB. While they have more competition now, it is clear they intend to stay on top of this game, squeezing every bit of performance out of this architecture, while providing nice feature set. We are talking high performance, high power amplifiers that are tiny yet deliver what people need in most cases. I am happy to recommend 3e audio A7 / A7 Mono stereo audio amplifiers."
Technical characteristics
| Specifications | |
|---|---|
| Product type | Class D amplifier |
| Channels | Stereo |
| Amplification chip | 2x TI TPA3255 |
| OPA | Dual OPA OPA1612A |
| Structure | PFFB |
| Inputs | 1x Single-ended RCA input 1x Balanced XLR/jack 6.35mm combo input |
| Output | 1x Speaker terminal output |
| Input impedance | RCA : 10KΩ XLR/TRS : 20KΩ |
| Volume attenuation | -50dB |
| Volume bypass | |
| RCA gain control | |
| Audio specifications (RCA IN) | |
|---|---|
| THD+N (5W) | 0.0007% @ 4Ω 0.0006% @ 8Ω |
| SNR (1% THD+N, 1KHz, A-wt) | 123dB |
| Dynamic range (1% THD+N, 1KHz, A-wt) | 123dB |
| Frequency response (±0.5dB) | 20Hz-35KHz |
| Noise (A-wt) | < 20uVrms |
| Crosstalk | -100dB |
| Gain | 26dB / 29dB |
| Input sentivity | 1.75Vrms |
| Output power (1% THD+N) | 2x 250W @ 4Ω 2x 140W @ 8Ω |
| Output power (10% THD+N) | 2x 300W @ 4Ω 2x 180W @ 8Ω |
| Output impedance | 2Ω-16Ω |
| audio specifications (XLR IN) | |
|---|---|
| THD+N (5W) | 0.0006% @ 4Ω 0.0005% @ 8Ω |
| SNR (1% THD+N, 1kHz, A-wt) | 126dB |
| Dynamic range (1% THD+N, 1KHz, A-wt) | 126dB |
| Frequency response (±0.5dB) | 20Hz-35KHz |
| Noise (A-wt) | < 15uVrms |
| Crosstalk | -110dB |
| Gain | 20dB |
| Input sensitivity | 3.5Vrms |
| Output power (1% THD+N) | 2x 250W @ 4Ω 2x 140W @ 8Ω |
| Output power (10% THD+N) | 2x 300W @ 4Ω 2x 180W @ 8Ω |
| Output impedance | 2Ω-16Ω |
| General | |
|---|---|
| Power supply | 38V-48V DC 5A/10A (The supplied power supply operates on 110V and 230V) |
| Power consumption | OFF: < 0.4W ON (no audio): 9W |
| Dimensions | 170 x 168 x 46mm |
| Weight | 1000g |
| Package | 1x 3E Audio A7 amplifier 1x 48V 10A mains adapter |
Data sheet
| Condition | New |
|---|
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