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Suspect amp power ratings
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<blockquote data-quote="Art Welter" data-source="post: 99976" data-attributes="member: 52"><p>Re: Suspect amp power ratings</p><p></p><p></p><p>And unfortunately, when it comes to musical low frequency power, the watts and voltage specifications don't tell the customer (who is always right) what they need to know.</p><p></p><p>Using music and pink noise I tested all the amps I had in house at the time, a mono SpeakerPower SP1-4000 plate amp, a Crest CC2800, a Crest CA-9, an old Crown PSA 2 (weighs 8 times more than the SP-4000 !) and a QSC PLX-3602.</p><p></p><p>All the rack amps are capable of 4 ohm bridged mono operation, so a single four ohm load was used. </p><p>Bridged mono 4 ohm the CC2800 is rated for 2800 watts, the CA-9 at 1800 watts, the PSA 2 at 1210 watts, the 3602 at 3600 watts, SP-4000 at 2400 watts.</p><p></p><p>With music and pink noise (30-100 Hz) into a B&C18SW115-4 loaded bass reflex sub run to just under clip or limit lights illuminating, the SP1-4000 equaled the SPL output of the CA-9 and the PLX 3602 (though one 3602 died during testing) put out about 4 dB more than the PSA 2, and 5 dB more than the CC-2800.</p><p></p><p>The 44 pound CA-9 could be driven another 3 dB or more louder than the other amps and still "sound good", while the limiters in the other amps kept level from increasing.</p><p>The CC-2800 limiter made the speaker sound like it was flapping as soon as it hit, horrible.</p><p></p><p>Although all the amps bench tested according to their specs, they didn't "sound" like their specs would indicate, and the difference was rather huge.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 99976, member: 52"] Re: Suspect amp power ratings And unfortunately, when it comes to musical low frequency power, the watts and voltage specifications don't tell the customer (who is always right) what they need to know. Using music and pink noise I tested all the amps I had in house at the time, a mono SpeakerPower SP1-4000 plate amp, a Crest CC2800, a Crest CA-9, an old Crown PSA 2 (weighs 8 times more than the SP-4000 !) and a QSC PLX-3602. All the rack amps are capable of 4 ohm bridged mono operation, so a single four ohm load was used. Bridged mono 4 ohm the CC2800 is rated for 2800 watts, the CA-9 at 1800 watts, the PSA 2 at 1210 watts, the 3602 at 3600 watts, SP-4000 at 2400 watts. With music and pink noise (30-100 Hz) into a B&C18SW115-4 loaded bass reflex sub run to just under clip or limit lights illuminating, the SP1-4000 equaled the SPL output of the CA-9 and the PLX 3602 (though one 3602 died during testing) put out about 4 dB more than the PSA 2, and 5 dB more than the CC-2800. The 44 pound CA-9 could be driven another 3 dB or more louder than the other amps and still "sound good", while the limiters in the other amps kept level from increasing. The CC-2800 limiter made the speaker sound like it was flapping as soon as it hit, horrible. Although all the amps bench tested according to their specs, they didn't "sound" like their specs would indicate, and the difference was rather huge. Art [/QUOTE]
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