32blownhemi Posted October 20, 2017 Share Posted October 20, 2017 I have Jube's with 402 horns & have been bi-amping with two Mc275's. One of my Mc275's quit working so I'd like to use one Mc275 for the 402 horns & my Crown 1002 for the bass bins. What settings do I have to set on the Crown? Thank You! Bill Quote Link to comment Share on other sites More sharing options...
carlthess40 Posted October 20, 2017 Share Posted October 20, 2017 For the crossovers or the sound level? Quote Link to comment Share on other sites More sharing options...
32blownhemi Posted October 20, 2017 Author Share Posted October 20, 2017 Thank you for answering but since I wrote this I read the owners manual, turned it on & I'm lost. I'll have to have someone do it for me.... Bill Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted October 20, 2017 Moderators Share Posted October 20, 2017 What were you using for a crossover before ? It would work with one Mc275 and one Crown 1002 if you have an active crossover or if passive, either amp would work. Quote Link to comment Share on other sites More sharing options...
32blownhemi Posted October 20, 2017 Author Share Posted October 20, 2017 Thank You Dtel, I should have explained more. I'm passive with a Xilica 4080. I can hook up both 402 horns to the Mc275. But can I just run both cables from my pre-amp into my Crown & then hook up both my Jube bins to the Crown & then just turn it on? Not even touching the setting? All this stuff pops up on the Crown display that's foreign to me.... Thanks again! Bill Quote Link to comment Share on other sites More sharing options...
carlthess40 Posted October 20, 2017 Share Posted October 20, 2017 What state are you in ? Quote Link to comment Share on other sites More sharing options...
32blownhemi Posted October 20, 2017 Author Share Posted October 20, 2017 Ventura, California... Ventura County... 60 miles north of LA... Are you at the Lake Mary that's by Mammoth Lakes? Quote Link to comment Share on other sites More sharing options...
Schu Posted October 20, 2017 Share Posted October 20, 2017 Sell them to me... Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted October 20, 2017 Share Posted October 20, 2017 Many ways to do this. The most straight forward is to bypass any DSP on the crown and let the 4080 do all the crossover settings for both the bass bins and tweeters (similar to what you had done before). One caveat, the input sensitivities on the two amps will probably differ. What we need to figure out now, requires you to put a one volt sine wave into the crown and measure the voltage out and then do the exact same thing with the Mac amp. Let us know the answer. Quote Link to comment Share on other sites More sharing options...
Chris A Posted October 20, 2017 Share Posted October 20, 2017 There is a way to get close: Simply connect the Crown to the bass bins and the Xilica where the MC275 was, then turn up the volume controls on each side of the Crown amp until it sounds balanced, first making sure that the Crown amp DSP settings are not using their internal crossover settings, i.e., those internal settings are clear. If it later sounds like too much or too little bass...you'll know what to do. The idea is to find the correct setting and then leave it at that setting. If you have a hand held SPL meter and a test CD that has 400 Hz 1/3-octave or 1-octave pink noise, you can get a little closer. Chris Quote Link to comment Share on other sites More sharing options...
32blownhemi Posted October 25, 2017 Author Share Posted October 25, 2017 Thank You Chris & Tom! Putting a 'one watt sine wave' into the amps is way over my head as is using a SPL meter with 1/3 octave. But, I'll call Crown tech support & ask them to walk me through clearing the internal settings & then try it by just adjusting the volume. I messed with it a little the other day & somehow set something up that I can't clear. Thanks again! Bill Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted October 25, 2017 Share Posted October 25, 2017 You do not even need and SPL meter, just a cheap volt meter will do (measure at the amp's output). The level of the signal is arbitrary (just keep it consistent). All this test will tell you is the difference in voltage gain between the two amplifiers. Quote Link to comment Share on other sites More sharing options...
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