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boxmaker85

Silver - Posts: 433

Joined: September 19, 2004

Location: United States

Posted: October 24, 2004 at 8:17 PM / IP Logged

I was just reading on JL's website and this thought occured as I read about it. The 13w7 has dual 1.5 ohm voice coils. They say you can run a channel to each coil (ie a two channel amp with one channel powering one coil and the other channel powering the other coil). Can this be done? And with any subwoofer (given the sub can handle the power)? I've got a 150x2 amp (bridged 460 too much for my one sub). But it can handle 300 watts. Could I run a channel to one coil and the other to the other coil and get 300 watts overall to the sub instead of the 460 bridged? Just curious

Also what do you guys think about the new MTX amps. Worth it or look into something else?

Thanks

stevdart

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Joined: January 24, 2004

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Posted: October 24, 2004 at 8:30 PM / IP Logged

You have to consider the ohm impedance of each voice coil. The amp is rated 150 X 2 at what ohm load? Second consideration is gain matching of each channel so that the sub's coils are getting equal power. Third is that a stereo signal to a subwoofer invites the possibility of some cancellation of sounds depending on the source music, where if both coils get the same mono sound of both left and right there is no possibility of cancellation.

But ultimately, running a DVC separately to each channel is the same power as bridging. Look at this: 2 ohm DVC sub, one coil (2 ohm) connected to left, the other to the right. The amp responds to a 2 ohm stereo load. Now...same sub, same amp. The two coils are wired in series for a total 4 ohm load, bridged to the amp. The amp still responds with a 2 ohm stereo output, which is the same as a 4 ohm mono output.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

boxmaker85

Silver - Posts: 433

Joined: September 19, 2004

Location: United States

Posted: October 24, 2004 at 8:47 PM / IP Logged

Sorry the amps 150 x 2 at 4 ohm. Now if I got a dual 4 ohm sub and I hook one of my channels up to one coil and the other channel up to the other coil that's 300 watts to that sub (it's rated at 460 x 1 @ 4 ohms). But yeah I didn't think about stereo and cancelation. But would that happen? That is two speakers being told to playing opposite signals. It shouldn't happen right?

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: October 24, 2004 at 9:13 PM / IP Logged

At 8 ohm (coils in series) bridged the amp should put out the same 300 watts. The output is limited because of the lower impedance of the 4 ohm bridged (2 ohm) load. I notice some amps are limited like that, some aren't. I would try that first and read voltage output at the bridged terminals with regular DMM and test tone. If the 300 watts isn't there, then go to the wiring of separate voice coils. There is conflicting opinion about powering the coils separately, but enough to know I wouldn't do it with my own equipment. As far as the cancellation goes, I understand it usually doesn't amount to much, and only occasionally during some passages depending on the music source. I don't know if I used the right phrasing, but DYohn has talked about this and I've read it on some other sources. All being equal as far as power goes, it's best to use one mono source. But if in your case you get the right power by splitting the signals to each coil, and bridging at 8 ohms doesn't give you the same power, then your best bet is to split them. I believe that adjusting gain with a meter so they match precisely would be necessary.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

jeffchilcott

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Posted: October 24, 2004 at 11:17 PM / IP Logged

frankly I would run the 460 watts, its alot better to over power a sub and adjust your gains and bass boost to cut distortion then run at just the rms power or less and try to do miricles and add to much distortion

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boxmaker85

Silver - Posts: 433

Joined: September 19, 2004

Location: United States

Posted: October 25, 2004 at 8:26 AM / IP Logged

I'm looking at going to a w7. It's got a 3 ohm voice coil. Will I need a perticular amp that runs this resistance or will any amp do it? If any amp will how do I get an estimate of what the power is at that impedance?

BTW thanks for all the info guys.

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dvc

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