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LJM L20.5 KEC Amplifier Modules (Pair)
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Accessories for this product
Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.
LJM L20.5 KEC Amplifier Modules KTB817 KTD1047 Class AB 2x400W @ 4 ohm (Pair)
The LJM L20.5 KEC amplifier module is based on 4 pairs of KEC PNP KTB817 and NPN KTD1047 transistors. It therefore operates in class AB and is capable of developing an output power of up to 400W into 4 ohm or 200W into 8 ohm and an output current of up to 15A, while maintaining an ultra-low noise level with a THD+N of 0.001% (A-weighted). The module also features a cascade input and a CFP (Complementary Feedback Pair) output. The gain stage is based on 3 transistors: KB1369, H669A and KD2061. For powering the module, we recommend using a voltage of +/-24V to +/-63V via the terminals provided. Signal input is via a screw terminal block, and amplified signal output is via terminals.
This amplifier module needs to be coupled to a HP protection module. LJM, for example, has a 63V 4700uF protection module available here.
LJM L20.5 KEC module overview
| 1 | AC power input |
| 2 | Amplified signal output |
| 3 | Signal input |
| 4 | 2 pairs of KB817 transistors |
| 5 | 2 pairs of KD1047 transitors |
The GND terminal shares the GND of the power supply and the negative pole of the loudspeaker.
Examples of wiring diagrams for LJM L20.5 KEC modules
Below are wiring examples for LJM L20.5 KEC amplifier modules with HP 63V 4700uF power supply and protection module.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Amplifier module |
| Amplification class | AB |
| Transitors | 4x KEC PNP KTB817 4x NPN KTD1047 |
| Channels | 2 (1 by board) |
| Input | Analog input on screw terminal block |
| Output | Output on terminals |
| Output power | 2x400W @ 4 ohm / 2x200W @ 8 ohm (power supply +/-63V) 2x250W @ 4 ohm / 2x125W @ 8 ohm / 2x500W @ 2 ohm (power supply +/-50V) |
| Input sensitivity | 2V |
| Max. output current | 15A |
| Frequency response | 20Hz-25kHz |
| THD+N | 0.001% (A-Weighted) |
| SNR | > 98dB |
| Damping factor | > 400 @ 8 ohm load |
| Gain | x31 |
| General | |
|---|---|
| Power supply | +/-24V to +/-65V |
| PCB dimensions | 156 x 49mm |
| Package | 1x Pair of LJM L20.5 KEC amplifier modules 8x Crimp terminals 16x Insulation foil for transistors |
| Input | Screw terminals |
| Output | PCB Connector |
| Channel | 2 (Stereo) |
| Class | Class A / AB |
| Amplifier chip | Transistors |
| Power (W) | 400.0 |
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