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<blockquote data-quote="n2audio" data-source="post: 4639977" data-attributes="member: 540940"><p>I know, and sadly, that's ridiculously over-rated. The 2x25A fuses won't tell you precise power, but 650x2 at 2 ohms is the same as saying 1300w bridged at 4 ohms, and there is no way that's even CLOSE to realistic.</p><p></p><p>Actually it's 110 + shipping -- so I guess it's around $125, but still a decent amp with quite a bit of power for the price.</p><p></p><p>Well, not exactly. Crossover points aren't just a wall that no higher (for LP) frequencies can pass. It's the point where frequencies begin to "roll off". With the LP at 60, a 61hz signal will barely be effected, a 65hz signal will be slightly quieter, a 70hz signal will be noticably quieter, 80 significantly quieter and so on. The rate of this "rolling off" depends on the slope of the crossover. 6db/octave rolls of slowly, 12db/octave a little faster. Generally higher slope crossovers are more complex to design/build, usually more desirable for the sq types and therefore more expensive. Although 12db crossovers are very common and perfectly adequate for most everyone.</p><p></p><p>I tend to set my sub LP's as high as I can w/o them sounding muddy. A good 8" (such as JL) in a good enclosure may play well up to several hundred hz. It's just something you'll have to listen to and find out for yourself.</p><p></p><p>Cadence for $116: but with only 2x20 fuses I doubt it can actually do 600w, maybe 400-500.</p><p></p><p><a href="http://cgi.ebay.com/CADENCE-600w-RMS-2-CHANNEL-COMPETITION-CAR-AMPLIFIER_W0QQitemZ300237847779QQcmdZViewItem?hash=item300237847779&amp;_trksid=p3286.m14.l1318" target="_blank">http://cgi.ebay.com/CADENCE-600w-RMS-2-CHANNEL-COMPETITION-CAR-AMPLIFIER_W0QQitemZ300237847779QQcmdZViewItem?hash=item300237847779&amp;_trksid=p3286.m14.l1318</a></p><p></p><p>Hifonics for $150:</p><p></p><p><a href="http://cgi.ebay.com/NEW-HIFONICS-ZEUS-600-WATT-2-CHANNEL-CAR-AMPLIFIER-AMP_W0QQitemZ300237365404QQcmdZViewItem?hash=item300237365404&amp;_trksid=p3286.m14.l1318" target="_blank">http://cgi.ebay.com/NEW-HIFONICS-ZEUS-600-WATT-2-CHANNEL-CAR-AMPLIFIER-AMP_W0QQitemZ300237365404QQcmdZViewItem?hash=item300237365404&amp;_trksid=p3286.m14.l1318</a></p><p></p><p>Similar hifonics for $140:</p><p></p><p><a href="http://cgi.ebay.com/08-HIFONICS-TXI6008-600W-A-B-CLASS-1-2-CH-AMP-NEW_W0QQitemZ360066082980QQcmdZViewItem?hash=item360066082980&amp;_trksid=p3286.m14.l1318" target="_blank">http://cgi.ebay.com/08-HIFONICS-TXI6008-600W-A-B-CLASS-1-2-CH-AMP-NEW_W0QQitemZ360066082980QQcmdZViewItem?hash=item360066082980&amp;_trksid=p3286.m14.l1318</a></p><p></p><p>Soundstream for $150:</p><p></p><p><a href="http://cgi.ebay.com/SOUNDSTREAM-XTA600-2-600w-RMS-2-CHANNEL-CAR-AMPLIFIER_W0QQitemZ280241648782QQcmdZViewItem?hash=item280241648782&amp;_trksid=p3286.m14.l1318" target="_blank">http://cgi.ebay.com/SOUNDSTREAM-XTA600-2-600w-RMS-2-CHANNEL-CAR-AMPLIFIER_W0QQitemZ280241648782QQcmdZViewItem?hash=item280241648782&amp;_trksid=p3286.m14.l1318</a></p><p></p><p>Lanzar Optidrive for $150: It's only around 500w, but it's higher priced because it's a full range class D which makes it physically small, and also more efficient than most 2 ch amps.</p><p></p><p><a href="http://cgi.ebay.com/600-Watt-2-Channel-HighOutput-Digital-Car-Amp-Amplifier_W0QQitemZ130233703717QQcmdZViewItem?hash=item130233703717&amp;_trksid=p3286.m14.l1318" target="_blank">http://cgi.ebay.com/600-Watt-2-Channel-HighOutput-Digital-Car-Amp-Amplifier_W0QQitemZ130233703717QQcmdZViewItem?hash=item130233703717&amp;_trksid=p3286.m14.l1318</a></p><p></p><p>The Profile still stands out as a really good buy.</p></blockquote><p></p>
[QUOTE="n2audio, post: 4639977, member: 540940"] I know, and sadly, that's ridiculously over-rated. The 2x25A fuses won't tell you precise power, but 650x2 at 2 ohms is the same as saying 1300w bridged at 4 ohms, and there is no way that's even CLOSE to realistic. Actually it's 110 + shipping -- so I guess it's around $125, but still a decent amp with quite a bit of power for the price. Well, not exactly. Crossover points aren't just a wall that no higher (for LP) frequencies can pass. It's the point where frequencies begin to "roll off". With the LP at 60, a 61hz signal will barely be effected, a 65hz signal will be slightly quieter, a 70hz signal will be noticably quieter, 80 significantly quieter and so on. The rate of this "rolling off" depends on the slope of the crossover. 6db/octave rolls of slowly, 12db/octave a little faster. Generally higher slope crossovers are more complex to design/build, usually more desirable for the sq types and therefore more expensive. Although 12db crossovers are very common and perfectly adequate for most everyone. I tend to set my sub LP's as high as I can w/o them sounding muddy. A good 8" (such as JL) in a good enclosure may play well up to several hundred hz. It's just something you'll have to listen to and find out for yourself. Cadence for $116: but with only 2x20 fuses I doubt it can actually do 600w, maybe 400-500. [URL="http://cgi.ebay.com/CADENCE-600w-RMS-2-CHANNEL-COMPETITION-CAR-AMPLIFIER_W0QQitemZ300237847779QQcmdZViewItem?hash=item300237847779&_trksid=p3286.m14.l1318"]http://cgi.ebay.com/CADENCE-600w-RMS-2-CHANNEL-COMPETITION-CAR-AMPLIFIER_W0QQitemZ300237847779QQcmdZViewItem?hash=item300237847779&_trksid=p3286.m14.l1318[/URL] Hifonics for $150: [URL="http://cgi.ebay.com/NEW-HIFONICS-ZEUS-600-WATT-2-CHANNEL-CAR-AMPLIFIER-AMP_W0QQitemZ300237365404QQcmdZViewItem?hash=item300237365404&_trksid=p3286.m14.l1318"]http://cgi.ebay.com/NEW-HIFONICS-ZEUS-600-WATT-2-CHANNEL-CAR-AMPLIFIER-AMP_W0QQitemZ300237365404QQcmdZViewItem?hash=item300237365404&_trksid=p3286.m14.l1318[/URL] Similar hifonics for $140: [URL="http://cgi.ebay.com/08-HIFONICS-TXI6008-600W-A-B-CLASS-1-2-CH-AMP-NEW_W0QQitemZ360066082980QQcmdZViewItem?hash=item360066082980&_trksid=p3286.m14.l1318"]http://cgi.ebay.com/08-HIFONICS-TXI6008-600W-A-B-CLASS-1-2-CH-AMP-NEW_W0QQitemZ360066082980QQcmdZViewItem?hash=item360066082980&_trksid=p3286.m14.l1318[/URL] Soundstream for $150: [URL="http://cgi.ebay.com/SOUNDSTREAM-XTA600-2-600w-RMS-2-CHANNEL-CAR-AMPLIFIER_W0QQitemZ280241648782QQcmdZViewItem?hash=item280241648782&_trksid=p3286.m14.l1318"]http://cgi.ebay.com/SOUNDSTREAM-XTA600-2-600w-RMS-2-CHANNEL-CAR-AMPLIFIER_W0QQitemZ280241648782QQcmdZViewItem?hash=item280241648782&_trksid=p3286.m14.l1318[/URL] Lanzar Optidrive for $150: It's only around 500w, but it's higher priced because it's a full range class D which makes it physically small, and also more efficient than most 2 ch amps. [URL="http://cgi.ebay.com/600-Watt-2-Channel-HighOutput-Digital-Car-Amp-Amplifier_W0QQitemZ130233703717QQcmdZViewItem?hash=item130233703717&_trksid=p3286.m14.l1318"]http://cgi.ebay.com/600-Watt-2-Channel-HighOutput-Digital-Car-Amp-Amplifier_W0QQitemZ130233703717QQcmdZViewItem?hash=item130233703717&_trksid=p3286.m14.l1318[/URL] The Profile still stands out as a really good buy. [/QUOTE]
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