Series and parallel...any advantages

jonz · 23rd January 2007, 11:50 PM

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

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

Nordic · 24th January 2007, 05:09 PM

Quote:

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 :

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]

23rd January 2007, 11:50 PM	#1
jonz diyAudio Member Join Date: Mar 2004 Location: Montreal	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?

24th January 2007, 12:26 AM	#2
jp88 diyAudio Member Join Date: Mar 2004 Location: NC	half the power. __________________ WHAT ____________

24th January 2007, 03:53 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Try it at 8 first. Decide if it's loud enough before trying the 2 ohm approach. It only a 6dB difference. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Three 10" 4Ohm subs, wired in series or series-parallel?	Nagamitsu	Car Audio	24	10th May 2009 03:24 AM
series or parallel?	medicman	Tubes / Valves	5	22nd January 2009 04:42 PM
Series vs parallel?	legendaryfrog	Full Range	5	14th December 2006 02:50 PM
series vs parallel SPL?	2litre	Multi-Way	16	22nd February 2006 09:58 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

24th January 2007, 12:37 AM	#3
Fast1one diyAudio Member Join Date: Sep 2006	If your amp can take it, run it at 2 ohms...check the distortion ratings for the amp as well...

24th January 2007, 09:21 PM	#7
jonz diyAudio Member Join Date: Mar 2004 Location: Montreal	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]

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read