things that puzzle me in the night.. |
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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In this particular instance I was referring to two c-audio sr707's driving two F218's loaded with 300w 8ohm oem pd186's . The choices link the drivers in in parallel to give 4ohms or individually to give 8 ohms and use the the 707 in bridge 2250w at 4 ohm, or dual mode 435w 8 ohm per channel. |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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The 707 is a pretty good amp for abuse, it will be happy at 4 ohm bridged, has very good thermal characteristics so I think the answer is in your question, do you want 435w per motor or 1125w per motor? Up to you, one is slightly low, one is slightly high - depends on who's driving I guess.
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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cilla.scope
Old Croc Legs all the way to her bottom.... Joined: 02 October 2009 Status: Offline Points: 2954 |
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you seem to have that wrong. An amp that does: 100W 8R, 200W 4R, 400W2R in stereo will do in bridge: 400W into 8R bridge or 800W into 4R bridge Remeber that in bridge, each half of the amp sees half of the impedance ... so as far as each side of the amp knows its just driving a 2R load, so for 4R bridge just take the 2R stereo figures and add them together. if you are ever looking at specs and the that calculation doesn't work out, then it means either the laws of physics have just stopped working, or they were lying about one of the figures. |
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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ... |
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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You're right of course, my bad, too much Weißbier last night I'm afraid!
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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Driving...
Manic dj's via an ff4000 (another dj mixer with a fearsome output level) So 8ohm dual on full chat with the limiters on brick or 4ohm bridge load with the gains knocked back and some room to breathe. In testing the clip lights seemed to come on at the same level in either mode.. For some reason I'm trying to persuade myself it sounds plumper at 8ohm. |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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cilla.scope
Old Croc Legs all the way to her bottom.... Joined: 02 October 2009 Status: Offline Points: 2954 |
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hehe, always a bad idea to post whilst the room is still spinning .. they day they make a laptop with a breathalyzer ....
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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ... |
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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4d, Once again the answers in the question, although we all know that the quick way to kill speakers is to feed them with distortion...
The good old sr707 had one major flaw and that was that the clip lights didn't work properly. They show clip only when they are at full brightness which is pretty hard to tell usually, The input was reasonably accurate though, it does want 775mv for full output if that helps. |
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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That will be the weekend then.. I think I should go to the pub before I say something else silly. |
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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Yep I'm off to my daughters for sunday lunch.. Slangevar... |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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S'pose could swop the 707's out for 606's bridged 1200w into 4ohm. Operating at maximum efficiency keep the room nice and warm.
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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4D, I thought I'd better keep my head down yesterday afternoon after, what shall we call it, "lunch", anyway all better now.
I will be doing another eBay assembly run this week, more testers, pad-in-xlrs etc and would love to sell you some pads BUT an alarm bell is ringing, You said "Manic dj's via an ff4000 (another dj mixer with a fearsome output level)" if you were hoping to control a mixer running into the red this is not the way, distortion is a speaker killer as you know so you would need to check that the dj mixer is still clean even way into the red before you can pad it down, if not or if you're not sure you will need to use phono pads that the HIFI boys use on the inputs from the cd players ( which will raise the s/n ratio) or cover the master fader in tape as it seems the standard limiting method Anyway, let me know if you need anything making up. Steve |
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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I'm pretty sure that the Formula Sound mixers don't distort even when run hard into the reds.
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