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Message: <blockquote data-quote="skypeaceFounder" data-source="post: 1605733" data-attributes="member: 36473">Hi to all peoples,I having a pair of 12" woofer, brand name "oxygen audio".Currently I using 2 unit 2 channel amp to run this woofer, but 1 of it is spoiled, as the car accessory people told me, because it got voice of "air plane" even add a device which is avoid this voice happen it also remain the same.So I desire to buy a new 4 channel amplifier to run my woofer, and the existing 1 of the good condition 2 channel use it to run for mid bass. But i'm not look for expensive, but which is sufficient to run my woofer then that is pretty enough.I found one amplifier come with this spec:MPLIFIER MRV-F705 <ul> <li data-xf-list-type="ul"> [*]Average Power Output/CH into 4 Ohms, 4 Channels Driven [*]@10Hz~40kHz, 0.5% THD 85W X 4 or 170W X 2 [*]@1kHz, 10% THD 250W X 4 or 500W X 2 [*]Low Pass Filter (VARIABLE) 40Hz ~ 150kHz [*]High Pass Filter (VARIABLE) 80Hz ~ 1.2kHz [*]Output of Bridged (BTL) Operation into 4 Ohms @ 1kHz, 1% THD 1000Watts [*]Frequency Response (-1dB) 10Hz ~ 40kHz [*]Signal to Noise Ratio ("A" WTD) >100dB [*]Input Sensitivity 100mV ~3V [*]Input Impedance 22k Ohms [*]Operation Voltage (Negative Ground) DC 12V [*]Speaker Impedance @ Stereo Driven 4 Ohms [*]Fuse Rating 40A X 1 [*]Dimension (WxHxD)mm 260X58X320 </li> </ul>PLease give me some comment about this spec.or please give me some suggestion normally wht is the important of the spec we should concern when buy an amplifier.If possible, hope some one who is expert, can like to share with us by explaining 1 by 1 what is the usage according the spec listed at above.Thank You so much for you valueable reply!!Cheers!</blockquote>