Purpose of Dual vs Single Voice Coils? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 16 Old 09-12-12, 01:30 PM Thread Starter
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Purpose of Dual vs Single Voice Coils?

This seems like something I should intuitively know, but I am having a hard time understanding the virtues of dual voice coil drivers. Does it have to do with multiple driver setups, versatility, or something completely different?
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post #2 of 16 Old 09-12-12, 02:24 PM
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Re: Purpose of Dual vs Single Voice Coils?

the first dvc subs i seen.were actually made to take a stereo source.it was a passive subwoofer that went between the amp and main speakers.now a days it might be to have multiple amp channels.driving a single unit.which kinda defeats the purpose if its a low power handling unit.in the case of something like the tc sounds 18.that can soak up tons of power.multiple voice coils and multiple amp channels to drive it could be useful.
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post #3 of 16 Old 09-12-12, 03:08 PM
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Re: Purpose of Dual vs Single Voice Coils?

They also give you the option of wiring them for 2 Ω or 8 Ω (Assuming it is a dual 4 Ω driver)

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post #4 of 16 Old 09-12-12, 04:34 PM Thread Starter
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Re: Purpose of Dual vs Single Voice Coils?

So essentially it gives you the option for wiring possibilities depending on the amp. Most HT applications are 4 ohm loads though, right?

That makes a lot more sense now, pharoah. If amps weren't bridgeable or there weren't many mono amps, it makes sense to be able to use a regular 2 channel amp.

Thanks
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post #5 of 16 Old 09-12-12, 05:25 PM
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Re: Purpose of Dual vs Single Voice Coils?

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BD55 wrote: View Post
So essentially it gives you the option for wiring possibilities depending on the amp. Most HT applications are 4 ohm loads though, right?
You can't really make such a broad assumption I'm afraid. There are definitely 4 ohm sub drivers -- as well as 2 ohm and 8 ohm -- but I'm not sure you can say "most" will be 4 ohm. Depends on the driver really.

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post #6 of 16 Old 09-12-12, 06:04 PM
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Re: Purpose of Dual vs Single Voice Coils?

Some sub drivers, such as the Polk MM1540, are available in both single voice coil versions, which are 4 Ohms, and dual voice coil versions for which each voice coil is 4 Ohms. The voice coils of the latter can be wired in parallel for 2 Ohms. If two subs are used, and independent control of the delay and/or level of each sub is needed, two channels of amplification are required. In such a situation, cost savings in amplification can be obtained with the 2 Ohm configuration.

Here's an example of two Crown amps:

Crown XLS2500
Power = 775 Watts per channel into 4 Ohms
Street price = $600

Crown XLS1500
Power = 775 Watts per channel into 2 Ohms
Street price = $400
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post #7 of 16 Old 09-12-12, 06:41 PM
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Re: Purpose of Dual vs Single Voice Coils?

AFAIK wiring options is the only reason.
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post #8 of 16 Old 09-13-12, 12:47 PM Thread Starter
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Re: Purpose of Dual vs Single Voice Coils?

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You can't really make such a broad assumption I'm afraid. There are definitely 4 ohm sub drivers -- as well as 2 ohm and 8 ohm -- but I'm not sure you can say "most" will be 4 ohm. Depends on the driver really.
Sorry, what I was trying to ask here was what is the typical ohm load for HT amplification. Thinking about it more, obviously there needs to be that versatility in wiring, loads, etc. Thanks
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post #9 of 16 Old 09-13-12, 12:54 PM Thread Starter
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Re: Purpose of Dual vs Single Voice Coils?

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Some sub drivers, such as the Polk MM1540, are available in both single voice coil versions, which are 4 Ohms, and dual voice coil versions for which each voice coil is 4 Ohms. The voice coils of the latter can be wired in parallel for 2 Ohms. If two subs are used, and independent control of the delay and/or level of each sub is needed, two channels of amplification are required. In such a situation, cost savings in amplification can be obtained with the 2 Ohm configuration.

Here's an example of two Crown amps:

Crown XLS2500
Power = 775 Watts per channel into 4 Ohms
Street price = $600

Crown XLS1500
Power = 775 Watts per channel into 2 Ohms
Street price = $400
Ok, but using my limited knowledge here, when you have a 2 ohm load, you will have a higher likelihood of overdriving the amp, right? Overheating, distortion, etc?
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post #10 of 16 Old 09-13-12, 02:47 PM
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Re: Purpose of Dual vs Single Voice Coils?

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Ok, but using my limited knowledge here, when you have a 2 ohm load, you will have a higher likelihood of overdriving the amp, right? Overheating, distortion, etc?
Yes, that's true. The amp must be designed to be capable of being used with a 2 Ohm load for this to work. Pro amps are commonly used in subwoofer applications, and these are often specified for operation into 2 Ohm loads. In the case of the Crown amps mentioned in my earlier post, the power ratings quoted are for 0.5 percent THD at 1kHz.

Consumer amps are a different story, and generally aren't specified for operation into 2 Ohm loads.
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