Exceeding Impedance Ratings (of a small amp)

CCmachine · 24th July 2009, 02:01 PM

I recently bought a small 40w amplifier, to make a small portable speaker:

http://www.kemo-electronic.com/bilde...34_350x244.jpg

Right now I'm powering it from 8 good rechargeable AAs, giving me 10-12v.

From my home surroundsound kit i took off the two back speakers I never use. Measured resistance with a multimeter is ~4.2Ω.

The amplifier is rated for 4 to 8 ohms on the amplified output. Would I damage the amplifier if i connected the speakers in parallel to the loudspeaker connectors (2.1Ω load) or am I better off connecting them in series (8.4Ω)?

Gordy · 24th July 2009, 07:01 PM

I take it you mean that they are two single drive units. I would say use them in series. Placing them in parallel might work, but is likely to load down the amp too much.

24th July 2009, 02:01 PM	#1
CCmachine diyAudio Member Join Date: Jul 2009	Exceeding Impedance Ratings (of a small amp) I recently bought a small 40w amplifier, to make a small portable speaker: http://www.kemo-electronic.com/bilde...34_350x244.jpg Right now I'm powering it from 8 good rechargeable AAs, giving me 10-12v. From my home surroundsound kit i took off the two back speakers I never use. Measured resistance with a multimeter is ~4.2Ω. The amplifier is rated for 4 to 8 ohms on the amplified output. Would I damage the amplifier if i connected the speakers in parallel to the loudspeaker connectors (2.1Ω load) or am I better off connecting them in series (8.4Ω)?

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
Exceeding electrolytic cap rating	Pierre	Power Supplies	22	16th September 2007 10:53 AM
ported box design question: is exceeding the Vas of the driver bad?	BrianGT	Multi-Way	13	15th May 2006 05:35 AM
Effect of exceeding XMAX in real life	jondoe	Multi-Way	18	25th May 2005 05:40 AM
Need help understanding transformer impedance ratios and impedance matching	percy	Tubes / Valves	5	28th February 2005 08:35 PM

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


	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 July 2009, 07:01 PM	#2
Gordy diyAudio Member Join Date: Nov 2006	I take it you mean that they are two single drive units. I would say use them in series. Placing them in parallel might work, but is likely to load down the amp too much.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)