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jonz 23rd January 2007 11:50 PM

Series and parallel...any advantages
Presently I have a dual Tempest IB... each wired parallel to give me 4 ohms per chanell of my Crest CPX 2600 . I just ordered 2 more subs...and the only way I can think of hooking them up is each in parallel and in series for the pair to give me 8 ohms per pair.

My amp is rated at 550 watts in 8 ohms per..or 750 in 4 ohms..

It can also take a 2 ohm at about 1000 watts per....
Is there any disadvanges in hooking them up at 8 ohms per side?

jp88 24th January 2007 12:26 AM

half the power.

Fast1one 24th January 2007 12:37 AM

If your amp can take it, run it at 2 ohms...check the distortion ratings for the amp as well...

Cal Weldon 24th January 2007 03:53 PM

Try it at 8 first. Decide if it's loud enough before trying the 2 ohm approach. It only a 6dB difference.

badman 24th January 2007 05:06 PM


Originally posted by Cal Weldon
Try it at 8 first. Decide if it's loud enough before trying the 2 ohm approach. It only a 6dB difference.

Nordic 24th January 2007 05:09 PM


Originally posted by jp88
half the power.

Half the distortion

jonz 24th January 2007 09:21 PM

For an infinite baffle setup a 750 Watt Tempest sub will max out around at 150 watts.. so I am powering 4 of them at around 500 watts per pair...

I wrote to Crest..this is what they had to say :

Thanks for your questions and support of Crest Performance amplifiers.
Using this amp in the stereo mode at 2 ohms per channel isn't
recommended. "UL"/Underwriters Laboratories didn't approve it, so we
agreed to abide by their decision and not promote this idea. I know
there are some people using this type amp bridged at 4 ohms which is
equivalent to 2 ohms stereo but they are using a band limited frequency
response such as 40Hz to 150Hz. I can't guarantee that there would't be
a problem under certain conditions. The fact of the matter is that no
amp will be operating optimally with a 2 ohm load. You'll get the most
long term continuous power with a 4 ohm load on each amp channel. The 2
ohm rating is more of a peak rating in reality. Thanks,

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