using uncoupled input (through)Full field effect tube output (three pairs per channel IRFP240 IRFP9240 from )Using PCB material technology.All components are brand new, non-bulk , quality guaranteed.Note:L15 and L series products do not circuit data, PCB data.Each L15 finished boards has been strictly tested.IRFP240 parameters:VDS=200V, ID=20A, PD=150WIRFP9240 parameters:VDS=200V, ID=12A, PD=150WThe product is equipped with insulating sheets. parameter:Frequency response range:5 HZ -0.1DB, 250K HZ -3DBFrequency response test:Audio Precision 2 testFrequency response test:10HZ-30 K HZ -0.05 DBVoltage range:DC +-15V to DC + -70VPower:150W 8R, 300W 4R, 600W 2R.(+ -55V power supply) 20V/US 0.02% 150W 8R. A weighting 97DBVOLTAGE GAIN=31 PCB size area=length 150MM, width=40 MMActual measurement:Frequency response test:AP SYS TWO testFrequency response test:10HZ-30 K HZ -0.05 DBType:A:The power tube of the finished board is under the PCBColour:As ShownMaterial:PC+MetalPackage Contents:2 * L15 FET Power AmplifierOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.