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Old 18th February 2009, 12:32 PM   #1
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Default Dual Voice Coil or Single - Sub

I am fairly a Newbie at Car Audio so I appologize for my lack of knowledge. I just purchased a Pioneer PRS-D2200T 2 channel amp for my sub or subs. Maybe I should of bought a mono-block type amp instead but that is water under the bridge. Anyhow, it is rated as follows:
150W RMS x 2 Channels at 4 ohms
600 W RMS x 1 Channel at 4 ohms
300 W RMS x 2 Channels at 2 ohms

My question is on what sub to get. I am looking at the Infinity Perfect 10.1 Sub. DO I GET THE DUAL VOICE COIL OR THE SINGLE VOICE COIL??? I was planning on just running one sub in a sealed enclosure. If I do run only one sub would I use a dual or single voice coil sub? It seems to me that if I run only one sub that it should be a single voice coil. The other question is what if I decide later to go to two subs. I am just trying to do the right thing here and I am trying to utilize or pull the most power out of my amp also. ALso, what is the best way to hook it up. I NEED HELP PLEASE!! Thank you all in advace for any help.
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Old 18th February 2009, 01:04 PM   #2
HK26147 is offline HK26147  United States
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Since you may want to go to 2 subs later ( my advice ); I would get (1) 4 ohm single VC woofer.
Run the amp bridged now and if you add a second 4 ohm sub, switch the amp to 2 channel unbridged.
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Old 18th February 2009, 01:05 PM   #3
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It doesn't really matter. If you get SVC you need 4 ohm coil, if you get DVC you need 2x 2 ohm coils. So get whichever of those meets with the Infinity spec.
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Old 18th February 2009, 01:22 PM   #4
AndrewT is offline AndrewT  Scotland
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don't buy a dual voice coil driver.
It is compromised simply to get the 4 leads out of the voice coil.

If you want good performance and good efficiency, use a good 8ohm driver on each channel. You should get >80W/channel into 8r0.

160W into 96dB/W/m drivers is louder than 600W into 90dB/W/m drivers and far louder than 600W into 86dB/W/m drivers.
Quote:
150W RMS x 2 Channels at 4 ohms 600 W RMS x 1 Channel at 4 ohms 300 W RMS x 2 Channels at 2 ohms
BTW,
there's something very wrong with this specification.
if each amp can push 150W into 4r0, it should be able to push 300W into 8r0 when bridged.
But, it will never be able to push 600W into 4r0 bridged, nor 300W into 2r0
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Old 18th February 2009, 01:43 PM   #5
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Thanks for the replies. How do I get the most power out of this amp for just one 4 ohm sub? Do I bridge the amp for the 600W x 1 at 4 ohms? Does anyone think that I will need 2 subs in a sealed enclosure in a Toyota Camry or will the one sub be efficient enough? I don't listen to rap music and I want a really tight bass line. If I do decide to run 2 subs, won't I need 2 of the dual voice coil subs wired in line or would I run the amp unbridged to each sub on a single voice coil?
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Old 18th February 2009, 01:48 PM   #6
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Andrew, how can you say that? OK all but the 2x150W power figures are exaggerated, but they will be following the trend that the spec gives.
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Old 18th February 2009, 03:11 PM   #7
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by richie00boy
Andrew, how can you say that?.
it simple current flow and voltage drops.
As the load resistance goes down the current goes up.
This inherently leads to increased voltage drops along traces, along wires, across semiconductors, everywhere, even from the SMPS.
Increased voltage drops equates to less voltage at the output and even less by the time the current reaches the speaker driver terminals.
A really good amp will lose of the order of 0.4dB to 0.6dB when the load impedance is halved.
A respectable amplifier will lose 0.7dB to 1dB.
Most car amplifiers will lose >1dB when the impedance is halved and some lose >2dB.

It comes down to "how gullible are the customers"?
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Old 18th February 2009, 03:16 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by kdhorne73
How do I get the most power out of this amp for just one 4 ohm sub?
Why do you want the most power output?
Would you settle for the most SPL from the driver?
Would you want good quality output?
Maybe these don't matter to Car Audio customers, most listeners of music like to hear what's on the recording.

BTW,
sub = what?
Answer, Sub - Bass, i.e. the frequencies below the bass notes.
Do you want Sub - Bass, or do you want musical Bass?
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Old 18th February 2009, 03:48 PM   #9
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True Andrew, we both know that. I guess I read your comment as it will never push anything much into 4 ohm bridged.
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Old 18th February 2009, 03:53 PM   #10
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Basically,the energy will remain the same as the constant value.
But it's easiesr and low cost to design a low-voltage/high-current amplifier.
That is,double coils with low impedance is better for a experience DIYer.
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