CX3500.1 Test Report and Product Video



Model number: class D X3500.1D
3500W RMS Class-D amplifier.
0.5 ohm load stable.
Double Side PCB and SMD components.
Adjustable Input level, LPF, Subsonic, bass boost function, Q control.
Advanced short circuit, overload, over heat, over and low voltage protection.
Advanced clip limit / thermal power limit function.
Easy bridgeable with same amplifier.
Optional remote controller.


Detailed specs:
3.1Test Condition.
All the specs were tested with following condition unless noted.
Power supply: 14.4V DC power supply
Test signal: 80Hz sine wave.
Loads: Resistor dummy load.
Environment: 25 degree C, open air.
Relative humidity: 70%.
Instrument: Audio Precision SYS-2322A.

1.1Output power performance

Following table is the RMS output power with THD+N(<22KHz) value at 5%, 3%, 2% and 1%.
RMS power (0.5ohm) RMS power (1ohm) RMS power(2ohm) RMS power(4ohm)
5% 3380W 2350W 1380W 750W
3% 3300W 2250W 1330W 720W
2% 3180W 2150W 1300W 700W
1% 3180W(2%) 1900W 1150W 550W
Table 1Output Power with THD+N

Following chart shows the output power with THD+N curve at 4ohm, 2ohm loads, 1ohm loads and 0.5ohm loads.
  Chart1. RMS output power @4ohm with THD+N
    Chart2. RMS output power @2ohm with THD+N
  Chart3. RMS output power @1ohm with THD+N
Chart4. RMS power @0.5ohm with THD+N

1.1      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 1.Bass boost frequency adjust(bass boost level set @ 12dB)

Chart 4.Bass boost level adjust (bass boost frequency set at 48Hz)

3.6 Bass boost Q control


THD+N=0.10% @ 20W output power with 4ohm load.
1.2Input level
1.3Signal and Noise Ratio
1.4Protect Function
1. Overload:
 Protect less than 0.44 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.
1.5Idle current and Efficiency:
Idle current: 1.90A
Efficiency:  88% when THD+N=1% at 4 ohm.
This amplifier’s size is at 228mmX502mmX52mm(W,L,H).