Reply to thread

Message

<blockquote data-quote="Art Welter" data-source="post: 34643" data-attributes="member: 52">Re: 2ohm Bridge MonoYour “small” 49 pound vs1500 amps may deliver more actual sub power than others rated at far more&nbsp;&nbsp; power.Though the Crest&nbsp; vs1500 is only rated for 70.7v RMS, it is rated for 200V peak, which would be 10,000 watts at 4 ohms.Current limiting would keep the amp from delivering high peak power at impedances below 4 ohms, so obviously a 2 ohm mono load, equivalent to a 1 ohm load will just cause the amp to pump (or &quot;sound like ass&quot; as Bennett so precisely puts it).Doubling the speakers gives you a real 3 dB, doubling power seldom gives a real 3 dB increase at high power levels due to thermal compression.Easy test to do, pick a track with a lot of slamming kick and bass, play it in to a pair of the SRX 728 run up to flashing the clip lights, then compare the output to one SRX 728 bridged mono with a dB meter set for fast response.I’d be willing to make a small bet that two SRX 728, one per side of your Crest&nbsp; vs1500 will have quite a bit more actual peak SPL output (at least 4 dB more) than one run bridged mono.I’d also bet the Crest&nbsp; vs1500 will make more actual sound come out of your subs than many amps rated for twice the RMS power, do an A/B amp comparison before you finalize your plan to buy Macrotechs.I was a bit surprised when I actually tested a variety of amps in the fashion I suggest above, as I mentioned in this review:<a href="http://www.soundforums.net/live/threads/1315-SpeakerPower-Torpedo-SP1-4000-Plate-Amp" target="_blank">http://www.soundforums.net/live/threads/1315-SpeakerPower-Torpedo-SP1-4000-Plate-Amp</a>Power specifications for amps used for subs don’t necessarily dictate real world performance, especially with less than perfect AC mains voltage.Art Welter</blockquote>

[QUOTE="Art Welter, post: 34643, member: 52"] Re: 2ohm Bridge Mono Your “small” 49 pound vs1500 amps may deliver more actual sub power than others rated at far more power. Though the Crest vs1500 is only rated for 70.7v RMS, it is rated for 200V peak, which would be 10,000 watts at 4 ohms. Current limiting would keep the amp from delivering high peak power at impedances below 4 ohms, so obviously a 2 ohm mono load, equivalent to a 1 ohm load will just cause the amp to pump (or "sound like ass" as Bennett so precisely puts it). Doubling the speakers gives you a real 3 dB, doubling power seldom gives a real 3 dB increase at high power levels due to thermal compression. Easy test to do, pick a track with a lot of slamming kick and bass, play it in to a pair of the SRX 728 run up to flashing the clip lights, then compare the output to one SRX 728 bridged mono with a dB meter set for fast response. I’d be willing to make a small bet that two SRX 728, one per side of your Crest vs1500 will have quite a bit more actual peak SPL output (at least 4 dB more) than one run bridged mono. I’d also bet the Crest vs1500 will make more actual sound come out of your subs than many amps rated for twice the RMS power, do an A/B amp comparison before you finalize your plan to buy Macrotechs. I was a bit surprised when I actually tested a variety of amps in the fashion I suggest above, as I mentioned in this review: [url]http://www.soundforums.net/live/threads/1315-SpeakerPower-Torpedo-SP1-4000-Plate-Amp[/url] Power specifications for amps used for subs don’t necessarily dictate real world performance, especially with less than perfect AC mains voltage. Art Welter [/QUOTE]

Verification