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  #1  
Old 07-18-2011, 08:55 PM
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Default Svc Subwoofers

I was talking to a buddy today and I have a question, are svc drivers stronger and more durable than dvc and quad vc drivers? or is the only reason dvc drivers took over in car audio due to the ability to wire them up at different ohm ratings easier?
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Old 07-18-2011, 08:56 PM
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Well, you don't see many svc woofers in big builds. Or at least I haven't.
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Old 07-18-2011, 08:59 PM
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Well, I know back in the day most amps were only 2 ohm stable or were only 2 ohm rated and as you know two svc 4 ohm subs wire up at 2 ohm, so it worked lol.. I remember wiring svc subs up at 4 ohm bridged on my old school fosgate amps.
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Old 07-18-2011, 09:00 PM
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No, it all depends on the materials used.
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Old 07-18-2011, 09:05 PM
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Originally Posted by nismos14 View Post
No, it all depends on the materials used.
Oh okay, so as long as it is a good subwoofer, say for some reason I had a single voice coil sundown and a dvc sundown they both would be solid performers and would handle the same amount of thermal power as each other.. so there is no difference just more wiring options?
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Old 07-18-2011, 09:10 PM
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Originally Posted by disturb3d_pri3st View Post
Well, I know back in the day most amps were only 2 ohm stable or were only 2 ohm rated and as you know two svc 4 ohm subs wire up at 2 ohm, so it worked lol.. I remember wiring svc subs up at 4 ohm bridged on my old school fosgate amps.
back in what day 2004? back when I first go into car audio (early 90s), there were plenty of amps that were rated at 4Ω under 25 watts per channel but could be ran down to 1Ω and a few at .5Ω. Soundstream, Orion, PG, and Lanzar were known for doing this IIRC they called them "cheater amps".
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Old 07-18-2011, 09:54 PM
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Originally Posted by fasfocus00 View Post
back in what day 2004? back when I first go into car audio (early 90s), there were plenty of amps that were rated at 4Ω under 25 watts per channel but could be ran down to 1Ω and a few at .5Ω. Soundstream, Orion, PG, and Lanzar were known for doing this IIRC they called them "cheater amps".
Well, I only go 11 years back sir lol, I don't go all the way back when!!!
Now my brother he is in his mid 30's so I was exposed to it all at a young age I blame him for my addiction!!!
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Old 09-12-2011, 05:28 PM
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Originally Posted by fasfocus00 View Post
back in what day 2004? back when I first go into car audio (early 90s), there were plenty of amps that were rated at 4Ω under 25 watts per channel but could be ran down to 1Ω and a few at .5Ω. Soundstream, Orion, PG, and Lanzar were known for doing this IIRC they called them "cheater amps".
^This^

Back in the late 80's bridging an amp was unheard of. From what I remember, Sherwood was the first to allow bridging. They had a 4 channel amp that ran at 4ohms or 2 ohms per channel and could be run to 2 channels at 2 ohms in stereo and 2 channels bridged into 1 channel at 4 ohms, or all 4 channels bridged into 2 channels @ 4 ohms. There were 2 switches that could be set to stereo or bridged; 1 switch per side.

DVC subs became popular before this was an option. You could run a two channel amp that was only rated at 4 ohms per channel to a 4 ohm DVC sub and still have room in the trunk for groceries, kegs, golf clubs, etc.

Then, when more amps became bridgeable, 8 ohm svc subs became popular. That way you could run an amp that was, let's say, 100 ohms x 2 @ 4 ohms or 300 watts x 1 @ 4 ohms, to two subs and get 150 watts per sub opposed to 100 watts per sub. It wasn't much of an increase, but it was an increase. Especially since it was uncommon to have a sub that could handle more than 150 watts, RMS back then.

Then the "cheater" amps started. IASCA was formed and, at first, did not allow cars to even have their engines on while competing. They were trying to level the playing field so all the cars weren't relying on their alternators to win. At first, companies like Rockford Fosgate (and many others) started to rate their amps at 11.6VDC. This was the common voltage seen by the amp after the voltage drop from a 12.6VDC battery. At 14.4VDC they were rated much higher.

Then, as mentioned, the fad became winning smaller classes by using amps that were factory rated at something like 22 watts x 2 @ 4 ohms (Like Phoenix Gold), but could be bridged down to 0.5 ohms and put out 300 watts. Use two of these and you were still in the "100 Watt and Under" class, but were putting out 600 watts!!

This is when DVC subs became popular, once again.
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Last edited by amalmer71; 09-12-2011 at 05:35 PM.
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Old 10-18-2011, 12:50 PM
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Initially dual voice coil subs accomplished two things. Dual coils - run one coil, put a potentiometer, short, or keep 2nd coil open would adjust the Q of the system. Also the second coil increased thermal handling of the driver as well.
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Old 10-18-2011, 01:30 PM
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Originally Posted by lanman31337 View Post
Initially dual voice coil subs accomplished two things. Dual coils - run one coil, put a potentiometer, short, or keep 2nd coil open would adjust the Q of the system. Also the second coil increased thermal handling of the driver as well.
So your saying a D2 woofer wired to 4ohms will handle more power thermally than the exact same sub with a S4ohm vc?

You guys should probably read this before you start spewing out incorrect information.
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