Members gadgetx23 Posted April 30, 2007 Members Share Posted April 30, 2007 I finally purchased a new amp to power our pair of Peavey SP118's (newer model). I'll be bridging a QSC RMX 1850HD for 900W per sub. I'll be using it for the first time this Saturday, and I have a few questions before setting it up: 1. low cut - I can't find what Peavey recommends cutting the SP118's at. Should I use the 30Hz or 50Hz filter? 2. clip limiter - The manual states "When driving subwoofers, some users let the amplifier clip without limiting because it gives extra 'punch' to kick drums and similar sounds"... Sounds dangerous to me - for my application, is it a better idea to leave the limiter on? 3. regarding clipping - with this setup, is it ok to see a brief flash on kick drum hits, or do I need to back off if I start seeing this? Link to comment Share on other sites More sharing options...
Members agedhorse Posted April 30, 2007 Members Share Posted April 30, 2007 30Hz is probably best, limiter on, brief flashing is fine. I don't like to run w/out the limiter because hard clipping at low frequencies bridged stresses the output devices due to longer time in clip per cycle. Just not a good idea, tough it doesn't mean it's 'definately" a bad thing (for subs only). That said, lapses in judgement means that you can send more power than that to upir subs if you decide to push things a bit and now your 900 watts per box can increase to as much as 1800 watts per box and that's way too much for the driver IMO. Link to comment Share on other sites More sharing options...
Members gadgetx23 Posted April 30, 2007 Author Members Share Posted April 30, 2007 Thanks once again Andy! That pretty well answers my questions. Link to comment Share on other sites More sharing options...
Members dboomer Posted April 30, 2007 Members Share Posted April 30, 2007 1. low cut - I can't find what Peavey recommends cutting the SP118's at. Should I use the 30Hz or 50Hz filter? QUOTE] I guess you just missed it ... it's right in the dead center of the first page of the owner's manual:eek: HPF - 35 - 40 Hz at 12 to 24dB/octave Link to comment Share on other sites More sharing options...
Members gadgetx23 Posted April 30, 2007 Author Members Share Posted April 30, 2007 Thanks Don. I didn't have a manual for these b/c I bought them used. After posting I did locate a manual on your website though. Guess I should have found that first 30Hz cut should be close enough then, correct? Link to comment Share on other sites More sharing options...
Members agedhorse Posted April 30, 2007 Members Share Posted April 30, 2007 You are kind of stuck with the limitations any piece of equipment offers. Actually, it's ironic, because I calculated about 38Hz for the result, but that's not an option for you. It's also good to know that Don's number and mine corrolate exactly in this case! Link to comment Share on other sites More sharing options...
Members dboomer Posted April 30, 2007 Members Share Posted April 30, 2007 30Hz cut should be close enough then, correct? 30Hz will give you more lows and 50 Hz more protection if you are driving them really hard. It's always a trade-off. What are you sending through the system? 30 Hz is pretty much unnecessary in my book for live music but may be needed in a DJ system. Link to comment Share on other sites More sharing options...
Members gadgetx23 Posted April 30, 2007 Author Members Share Posted April 30, 2007 30Hz will give you more lows and 50 Hz more protection if you are driving them really hard. It's always a trade-off. What are you sending through the system? 30 Hz is pretty much unnecessary in my book for live music but may be needed in a DJ system. It's for live music. The kick drum is the majority of what will comes through our subs. Guitars/Vox have a high pass at 75Hz from the mixer and the bass is only added significantly for outdoor shows. We also use an overhead condensor on the drums. I have an adjustable low cut on my B'ger FBQ6200 EQ - but I figured the low-cut on the amp would work better than trying to dial it in with any sort of accuracy. I was going to start using it that for strictly monitors anyway. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted May 1, 2007 CMS Author Share Posted May 1, 2007 For live music and primarily kick, 50Hz would be fine. Link to comment Share on other sites More sharing options...
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