4ohm amp to 8 ohm sub question

olly-s · 1st July 2008, 04:59 PM

Hi, i have just brought a amplifier thats rated at 4ohms, i was thinking of using a peerless xls10, which is rated at 8ohm, can i connect this as it is or shall i use a 4 ohm resistor in parrallel?
which method would be the best?

also will the resistor get very hot and possibly brake, causing damage the amp or sub?

thx Olly

Cal Weldon · 1st July 2008, 05:02 PM

Connect it directly. What the amp rating tells you is the lowest recommended impedance for the amp. Do not use a 4 ohm resistor. That is a complete waste of power and will drop the impedance below 4 ohms.

acid_k2 · 1st July 2008, 05:13 PM

note: your amp (on 8 ohm load) will produce probably about half the power, then the rated power on 4 ohm load. But it will run cooler (and longer...)

Cal Weldon · 1st July 2008, 05:16 PM

...and you'll be hard pressed to notice the difference, it's only 3 dB.

olly-s · 1st July 2008, 10:40 PM

cool, thx guys for clearing that up. cant wait to get started

1st July 2008, 04:59 PM	#1
olly-s diyAudio Member Join Date: Apr 2008	4ohm amp to 8 ohm sub question Hi, i have just brought a amplifier thats rated at 4ohms, i was thinking of using a peerless xls10, which is rated at 8ohm, can i connect this as it is or shall i use a 4 ohm resistor in parrallel? which method would be the best? also will the resistor get very hot and possibly brake, causing damage the amp or sub? thx Olly

1st July 2008, 05:02 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Connect it directly. What the amp rating tells you is the lowest recommended impedance for the amp. Do not use a 4 ohm resistor. That is a complete waste of power and will drop the impedance below 4 ohms. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

1st July 2008, 05:16 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	...and you'll be hard pressed to notice the difference, it's only 3 dB. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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1st July 2008, 05:13 PM	#3
acid_k2 diyAudio Member Join Date: Oct 2006	note: your amp (on 8 ohm load) will produce probably about half the power, then the rated power on 4 ohm load. But it will run cooler (and longer...)

1st July 2008, 10:40 PM	#5
olly-s diyAudio Member Join Date: Apr 2008	cool, thx guys for clearing that up. cant wait to get started

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