CX6500 Test Report and Product Pictures


Model number: CX6500
6500W RMS Class-D amplifier.
1 ohm load stable.
Double Side PCB and SMD components.
Adjustable Input level, LPF, Subsonic, bass boost level, bass boost frequency, Q control.
Advanced short circuit, overload, over heat, over/low voltage protection.
Advanced clip limit / thermal power limit function.
Optional remote controller.
3 Detailed specs:
3.1 Test Condition.
All the specs were tested with following condition unless noted.
1. Power supply: 14.4V DC power supply
2. Test signal: 80Hz sine wave.
3. Loads: Resistor dummy load.
4. Environment: 25 degree C, open air.
5. Relative humidity: 70%.
6. Instrument: Audio Precision SYS-2322A.
3.2 Output power performance

Following table is the RMS output power with THD+N(<22KHz) value at 5%, 3%, 2% and 1%.
RMS power (1ohm) RMS power (2ohm) RMS power(4ohm) RMS power(8ohm)
5% 7500W 4200W 2850W 1600W
3% 7200W 4000W 2720W 1510W
2% 7000W 3800W 2620W 1480W
1% NA NA 2200W 1360W
Table 1Output Power with THD+N
Following chart shows the output power with THD+N curve at 8ohm, 4ohm, 2ohm loads, 1ohm loads.
Chart1. RMS output power @8ohm with THD+N

  Chart2. RMS output power @ 4ohm with THD+N
  Chart3. RMS output power @ 2ohm with THD+N

Chart4. RMS power @ 1ohm with THD+N

3.3 Frequency Response

1. -3dB frequency response: 14Hz~220Hz.
2. -1dB frequency response: 18Hz~170Hz.

3.4 LPF & Subsonic Filter features

  1. LPF adjustable from 55Hz~225Hz with 24dB/Oct slope.
  2. Subsonic Filter adjustable from 15Hz~52with 24dB/Oct slope.
Chart 1.LPF response

Chart 2.Subsonic Filter response

3.5 Bass Boost Feature
Bass boost center frequency adjustable from 32Hz~90Hz, level adjustable from 0~12dB.
Chart 4.Bass boost level adjust (bass boost frequency set at 48Hz)

3.6 Bass boost Q control

3.7 THD+N
THD+N=0.48% @ 250W output power with 4ohm load.
3.8 Signal and Noise Ratio
3.9 Protect Function
1. Overload: 
 Protect less than 0.8 Ohm loads at full scale output power.
2. Short Circuit:
 Full rated power short circuit protect test:  passed.
 Full rated power long last short circuit test: 10 minutes passed.
3. Over temperature:
 Limit output power while inner temperature reach 75 degree C, protect while inner temperature reach 85 degree C.
4. Low voltage:
Protect while power supply voltage lower than 8.6V.
5. over voltage:
Protect while power supply voltage over 16.5V.
6. Power limit / Clip limit.
Clip limit while THD+N≥1%.
Power limit while inner temperature over 75 degree C.
3.10 Idle current and Efficiency:
1. Idle current: 4.35A
2. Efficiency:  88% when THD+N=1% at 4 ohm.
3.11 Dimension
This amplifier’s size is at 228mmX502mmX104mm(W,L,H).