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Old 23rd January 2007, 11:50 PM   #1
jonz is offline jonz  Canada
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Default 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?
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Old 24th January 2007, 12:26 AM   #2
jp88 is offline jp88  United States
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half the power.
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Old 24th January 2007, 12:37 AM   #3
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If your amp can take it, run it at 2 ohms...check the distortion ratings for the amp as well...
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Old 24th January 2007, 03:53 PM   #4
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Try it at 8 first. Decide if it's loud enough before trying the 2 ohm approach. It only a 6dB difference.
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Old 24th January 2007, 05:06 PM   #5
badman is offline badman  United States
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Quote:
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.
Agreed
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Old 24th January 2007, 05:09 PM   #6
Nordic is offline Nordic  South Africa
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Quote:
Originally posted by jp88
half the power.

Half the distortion
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Old 24th January 2007, 09:21 PM   #7
jonz is offline jonz  Canada
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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 :


Hello,
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,
Aubrey
]
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