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Message: <blockquote data-quote="PPI_GUY" data-source="post: 7571435" data-attributes="member: 618066">I have a download of the HCCA 225r manual and it shows 2x20 amp fuses (40 amps total). It also states input sensitivity as "200 milli-volts to 5 volts rms". These specs are for the r series  that directly followed the pop-tops. Specs should be pretty close on both series.Personally, I wouldn't use a high current amp at low imp (1 ohm mono or .5 ohm stereo) without doing the Big 3. If you choose to try it, atleast install a voltmeter to be on the safe side. I cannot stress enough how imprtant a good solid ground is on a high current amp. Whatever the factory calls for, I always use the next bigger size wire and double or triple check the ground contact point. Old school equipment is just that, old. But, it has usually lasted this long for one reason, it was made tough to begin with.</blockquote>

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