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| Subwoofer Question https://mail.karaokescene.net/forums/viewtopic.php?f=1&t=7129 |
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| Author: | Big Mike [ Mon Jun 19, 2006 10:51 pm ] |
| Post subject: | Subwoofer Question |
Ok techno guys, I've got to pick your brains on this one. I just picked up a subwoofer for my larger shows or for outdoor gigs. The thing is monster and I want to make sure to get everything right to avoid damaging anything. Here's what I've got, please tell me the best way to put it together. I'm running out of a Mackie DFX 12 Mixer into a Crown CE2000 amp. Generally I run a set of speakers (occasionally a pair of speakers for larger venues) on each side in stereo mode. I've got a second CE2000 that I'd like to use to run the subwoofer, probably in bridged mono mode for more power. The sub is a GMI1800. 18" with 5" voice coil (4 layers) Freq. response 30-300Hz, 2000 watts peak power. Thanks in advance! |
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| Author: | Lonman [ Tue Jun 20, 2006 1:23 am ] |
| Post subject: | Re: Subwoofer Question |
With what I could find on the specs of the sup it lloks as though it would take the 2nd CE2000 bridged with no problem. The CE2000 bridge pushes 1300 watts into 8 ohms bridged & it lloks like the sub you are using can handle 2000 watts PEAK which mean it can probably handle 1000 watts program. The CE2000 bridged is probably a little more than it wants, but if you turn it down a bit it should be fine. Recommend you use an external crossover with though!!! |
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| Author: | Tony [ Tue Jun 20, 2006 4:16 am ] |
| Post subject: | Re: Subwoofer Question |
Lonman @ Tue Jun 20, 2006 9:23 am wrote: Recommend you use an external crossover with though!!! Do make sure it's an active X-over though, not a passive one.
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| Author: | Guest [ Tue Jun 20, 2006 11:16 pm ] |
| Post subject: | Re: Subwoofer Question |
I use two subs and two tops. One amplifier. Two speaker cables to the bottoms from the amp and jack out of the bottoms to the tops. What's the problem? Had two or three of those 2000's, dumped them because they crapped out. Even the music store won't handle them. |
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| Author: | Tony [ Wed Jun 21, 2006 4:26 am ] |
| Post subject: | Re: Subwoofer Question |
Bigdog @ Wed Jun 21, 2006 7:16 am wrote: I use two subs and two tops. One amplifier. Two speaker cables to the bottoms from the amp and jack out of the bottoms to the tops. What's the problem?
No problem at all, as long as you use X-Overs. Otherwise you will have damaging frequencies mudding up the speakers, i.e. bass to the mids/tops and mids/tops to the bass bins. |
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| Author: | Big Mike [ Wed Jun 21, 2006 4:27 am ] |
| Post subject: | Re: Subwoofer Question |
If you had read my original post, I am running ONE subwoofer on it's own amplifier in conjunction with one, sometimes two pairs of speakers on another. As for the 2000s, I've been running mine 4-5 nights a week for the past 3 years without a glitch. Yours probably died due to a lack of maintenance. Those things are heavy breathers and they inhale a whole lot of dust and crud in a bar/nightclub environment and then the cooling sinks clog up. As we all know, after water, heat is an amplifier's worst enemy. You gotta open those babies up a couple times a year and blow the dust out of them. |
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| Author: | Jian [ Wed Jun 21, 2006 6:55 am ] |
| Post subject: | Re: Subwoofer Question |
AllStar @ 21st June 2006, 8:26 pm wrote: Bigdog @ Wed Jun 21, 2006 7:16 am wrote: I use two subs and two tops. One amplifier. Two speaker cables to the bottoms from the amp and jack out of the bottoms to the tops. What's the problem? No problem at all, as long as you use X-Overs. Otherwise you will have damaging frequencies mudding up the speakers, i.e. bass to the mids/tops and mids/tops to the bass bins. How do you use a x-over with one amp? |
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| Author: | Tony [ Wed Jun 21, 2006 7:03 am ] |
| Post subject: | Re: Subwoofer Question |
Quote: How do you use a x-over with one amp? You don't. In a crossover design the crossover goes before the power amps, after your pre-amp (or mixer in a PA type system). You need one power amp for each "way" of your crossover-- 2 for 2 way, 3 for 3 way, etc. x2 for stereo.
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| Author: | Jian [ Wed Jun 21, 2006 7:10 am ] |
| Post subject: | Re: Subwoofer Question |
AllStar @ 21st June 2006, 11:03 pm wrote: Quote: How do you use a x-over with one amp? You don't. In a crossover design the crossover goes before the power amps, after your pre-amp (or mixer in a PA type system). You need one power amp for each "way" of your crossover-- 2 for 2 way, 3 for 3 way, etc. x2 for stereo.I am fully aware of the way its set up, but BigDog use one amp and only one amp. When I mix for the band we sometime use more then 3 amps |
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| Author: | Lonman [ Wed Jun 21, 2006 7:21 am ] |
| Post subject: | Re: Subwoofer Question |
AllStar @ Wed Jun 21, 2006 4:26 am wrote: Bigdog @ Wed Jun 21, 2006 7:16 am wrote: I use two subs and two tops. One amplifier. Two speaker cables to the bottoms from the amp and jack out of the bottoms to the tops. What's the problem? No problem at all, as long as you use X-Overs. Otherwise you will have damaging frequencies mudding up the speakers, i.e. bass to the mids/tops and mids/tops to the bass bins. Well unless it's just using the internal crossover in the sub which robs power & is locked into 1 frequency which may not work in all rooms. |
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| Author: | Lonman [ Wed Jun 21, 2006 7:24 am ] |
| Post subject: | Re: Subwoofer Question |
Jian @ Wed Jun 21, 2006 6:55 am wrote: AllStar @ 21st June 2006, 8:26 pm wrote: Bigdog @ Wed Jun 21, 2006 7:16 am wrote: I use two subs and two tops. One amplifier. Two speaker cables to the bottoms from the amp and jack out of the bottoms to the tops. What's the problem? No problem at all, as long as you use X-Overs. Otherwise you will have damaging frequencies mudding up the speakers, i.e. bass to the mids/tops and mids/tops to the bass bins. How do you use a x-over with one amp? Well you CAN use one amp for a bi-amp - low frequencies on one channel & highs on the other, wouldn't want to use 1 amp for both subs AND full range - although I have in a pinch. I run a tri-amped system at this moment. |
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| Author: | Lonman [ Wed Jun 21, 2006 7:27 am ] |
| Post subject: | Re: Subwoofer Question |
Jian @ Wed Jun 21, 2006 7:10 am wrote: AllStar @ 21st June 2006, 11:03 pm wrote: Quote: How do you use a x-over with one amp? You don't. In a crossover design the crossover goes before the power amps, after your pre-amp (or mixer in a PA type system). You need one power amp for each "way" of your crossover-- 2 for 2 way, 3 for 3 way, etc. x2 for stereo.I am fully aware of the way its set up, but BigDog use one amp and only one amp. When I mix for the band we sometime use more then 3 amps Again he's probably using a sub with a built in passive crossover allowing a high pass range at a locked frequency to the full range tops. Biggest downfalls to it is it's not the most efficient or cleanest method, the frequency is a fixed point which may not work in all rooms and you can't adjust the individual volume of the sub - sometimes much needed. |
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| Author: | Jian [ Wed Jun 21, 2006 7:34 am ] |
| Post subject: | Re: Subwoofer Question |
Lonman @ 21st June 2006, 11:27 pm wrote: Jian @ Wed Jun 21, 2006 7:10 am wrote: AllStar @ 21st June 2006, 11:03 pm wrote: Quote: How do you use a x-over with one amp? You don't. In a crossover design the crossover goes before the power amps, after your pre-amp (or mixer in a PA type system). You need one power amp for each "way" of your crossover-- 2 for 2 way, 3 for 3 way, etc. x2 for stereo.I am fully aware of the way its set up, but BigDog use one amp and only one amp. When I mix for the band we sometime use more then 3 amps Again he's probably using a sub with a built in passive crossover allowing a high pass range at a locked frequency to the full range tops. Biggest downfalls to it is it's not the most efficient or cleanest method, the frequency is a fixed point which may not work in all rooms and you can't adjust the individual volume of the sub - sometimes much needed. And he has the best. |
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| Author: | Tony [ Wed Jun 21, 2006 7:53 am ] |
| Post subject: | Re: Subwoofer Question |
Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers. |
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| Author: | Jian [ Wed Jun 21, 2006 7:58 am ] |
| Post subject: | Re: Subwoofer Question |
AllStar @ 21st June 2006, 11:53 pm wrote: Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers.
He did mention about comp before the amp. |
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| Author: | Lonman [ Wed Jun 21, 2006 8:00 am ] |
| Post subject: | Re: Subwoofer Question |
AllStar @ Wed Jun 21, 2006 7:53 am wrote: Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers.
I always run one (dbx 166) on the main inserts of the mixer - little compression but a solid limiter. Helps protect overall system. |
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| Author: | Lonman [ Wed Jun 21, 2006 8:01 am ] |
| Post subject: | Re: Subwoofer Question |
Jian @ Wed Jun 21, 2006 7:58 am wrote: AllStar @ 21st June 2006, 11:53 pm wrote: Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers. He did mention about comp before the amp. He did? |
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| Author: | Tony [ Wed Jun 21, 2006 8:04 am ] |
| Post subject: | Re: Subwoofer Question |
Jian @ Wed Jun 21, 2006 3:58 pm wrote: AllStar @ 21st June 2006, 11:53 pm wrote: Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers. He did mention about comp before the amp. 
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| Author: | Tony [ Wed Jun 21, 2006 8:06 am ] |
| Post subject: | Re: Subwoofer Question |
Lonman @ Wed Jun 21, 2006 4:00 pm wrote: AllStar @ Wed Jun 21, 2006 7:53 am wrote: Some good info here. I would suggest a limiter after the X-Over and before the amp. This will most certainly help when it get's to preventing overdriving the speakers. I always run one (dbx 166) on the main inserts of the mixer - little compression but a solid limiter. Helps protect overall system.  I can see you look after your equipment. I do the same, I hate replacing speaker coils.
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| Author: | Jian [ Wed Jun 21, 2006 8:07 am ] |
| Post subject: | Re: Subwoofer Question |
He mention it some where, not in this thread. |
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