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Junior Varsity
bridging amplifiers for dual 18 passive subs
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<blockquote data-quote="Nathan Ridge" data-source="post: 10544" data-attributes="member: 7708"><p>Hi All,</p><p></p><p>Like to start by saying im pretty newbie when it comes to sound, I work in IT I just always get dragged into looking at sound issues at a nightclub I use to DJ at, if anyone could help me with this issue would be greatly appreciated.</p><p></p><p>The club keeps blowing sub drivers, we have had BOSe look at the DSP box and they say its correctly tuned and set and from what limited knowledge I have and help of some local guys at the hire shop we have concluded the amps are crap, they are heating up and clipping under load, they are a chinese clone and I think the quality is not there.</p><p></p><p>The sub bins we are running are all dual 18" passive with Celestion 1000w drivers, few P-Audio recones and a couple B52 bins also. We have been hiring some EV P3000 amps which aren't blowing subs anymore but also they seem noticeably quiter than other amps, the other amps didn't have a input gain sensitivity control as the P3000 dont also.</p><p></p><p>Now I have been told by the sound hire guys i should not run the p3000 amps in bridge mode, bridge mode is 2400w @ 8ohms and the sub bins are running two 8ohm drivers would then be 4ohm. Now this is where im confused. They are saying that the P3000 should not be running in bridge mode which i intended to do to give heaps of headroom and leave it in stereo which does 1200w per channel at 4ohm which should match the sub bins.</p><p></p><p>When i look at the B52 site though ( two of the 4 sub bins at b52 ), it also has 2 x 1000w 8ohm drivers in it yet it states its nominal impendence is actually 8ohms :</p><p></p><p><a href="http://www.b-52pro.com/products/PA1818S.html" target="_blank">http://www.b-52pro.com/products/PA1818S.html</a></p><p></p><p>Which then to me suggests that running the p3000 in bridge mode would suit.</p><p></p><p>So my question is how are some subs 8ohm nominal and some 4ohm nominal when they both have two 8ohm 1000w drivers ? and secondly the sub bins that are rated at 4ohm nominal will it indeed hurt them running a single p3000 amp in bridge mode on them? My plan was to run one p3000 amp on each sub bin in bridge mode, heaps of headroom.</p><p></p><p>Any help appreciated.</p><p></p><p>Regards</p><p></p><p>Nathan</p></blockquote><p></p>
[QUOTE="Nathan Ridge, post: 10544, member: 7708"] Hi All, Like to start by saying im pretty newbie when it comes to sound, I work in IT I just always get dragged into looking at sound issues at a nightclub I use to DJ at, if anyone could help me with this issue would be greatly appreciated. The club keeps blowing sub drivers, we have had BOSe look at the DSP box and they say its correctly tuned and set and from what limited knowledge I have and help of some local guys at the hire shop we have concluded the amps are crap, they are heating up and clipping under load, they are a chinese clone and I think the quality is not there. The sub bins we are running are all dual 18" passive with Celestion 1000w drivers, few P-Audio recones and a couple B52 bins also. We have been hiring some EV P3000 amps which aren't blowing subs anymore but also they seem noticeably quiter than other amps, the other amps didn't have a input gain sensitivity control as the P3000 dont also. Now I have been told by the sound hire guys i should not run the p3000 amps in bridge mode, bridge mode is 2400w @ 8ohms and the sub bins are running two 8ohm drivers would then be 4ohm. Now this is where im confused. They are saying that the P3000 should not be running in bridge mode which i intended to do to give heaps of headroom and leave it in stereo which does 1200w per channel at 4ohm which should match the sub bins. When i look at the B52 site though ( two of the 4 sub bins at b52 ), it also has 2 x 1000w 8ohm drivers in it yet it states its nominal impendence is actually 8ohms : [url]http://www.b-52pro.com/products/PA1818S.html[/url] Which then to me suggests that running the p3000 in bridge mode would suit. So my question is how are some subs 8ohm nominal and some 4ohm nominal when they both have two 8ohm 1000w drivers ? and secondly the sub bins that are rated at 4ohm nominal will it indeed hurt them running a single p3000 amp in bridge mode on them? My plan was to run one p3000 amp on each sub bin in bridge mode, heaps of headroom. Any help appreciated. Regards Nathan [/QUOTE]
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bridging amplifiers for dual 18 passive subs
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