Amplifier Classes
There have been many developments in audio electronics, resulting in different amplifier circuit designs. Such designs can be divided into classes, of which 4 main types are relevant to audio – A, AB, H and D.
QA Series Power Amplifiers
172.020UK
QA400
Professional dual channel power amplifiers delivering high quality, dependable performance at an accessible price. Design of these workhorse amplifiers has been focused upon high power delivery wit...
- High power delivery
- Overheat/overload protection
- Multiple input and output connection types
QA Series Power Amplifiers
Professional dual channel power amplifiers delivering high quality, dependable performance at an accessible price. Design of these workhorse amplifiers has been focused upon high power delivery without over-complicated features adding excessive costs. Yet still, these units are furnished with multiple connection possibilities and self protection circuitry to ensure that they will deliver, whatever the application.
- High power delivery
- Overheat/overload protection
- Multiple input and output connection types
- Balanced and unbalanced inputs
- 2U 19" rack mountable
- Power supply 110/240Vac, 50/60Hz (IEC)
- THD 0.25%
- SNR 90dB
- Inputs Combo (6.3mm jack + XLR) and RCA
- Outputs SPK, 6.3mm jack and 4mm binding posts
Versions
| 172.020UK | 172.025UK | |
|---|---|---|
| Power max. @ 4 Ohms | 2 x 200W | 2 x 500W |
| Fuse rating | T5A (240V) / T10A (110V) | T5A (240V) / T10A (110V) |
| Power rms @ 4 Ohms | 2 x 100W | 2 x 250W |
| Power rms @ 8 Ohms | 2 x 70W | 2 x 170W |
| Dimensions | 88 x 482 x 270mm | 88 x 482 x 340mm |
| Weight | 6.8kg | 9.1kg |
Support : articles
Power Ratings: RMS vs Max vs Peak
A summary explaining the key differences between RMS, Max and Peak power ratings.
Downloads
Instruction manual
For 172.020UK (713KB)
For 172.020UK (713KB)
UK Declaration of conformity
For 172.020UK (248KB)
For 172.020UK (248KB)
EU Declaration of conformity
For 172.020UK (238KB)
For 172.020UK (238KB)
