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Old 22nd November 2012, 11:12 AM   #1
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Default Using old organ speaker for PA?

Iíve recently acquired a 10Ē organ speaker from a unknown source. I would like to build a PA system for outdoor use. My old system consisted of 2x5 inch drivers, 60W max. What rating would this speaker be, and how could I decrease it from 15 ohms to a more usable 4 or 8 ohms?
Iím thinking quiet outside music, and medium volume indoors. I donít know the rating of this speaker, but it sounded very loud in its original box connected to a cheap AV amplifier.
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Old 23rd November 2012, 12:45 PM   #2
Xoc1 is offline Xoc1  United Kingdom
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A 16 ohm speaker may not be a problem - it depends on what sized amplifier you have to drive it with. A 1 kw stereo amp will produce approx 500 w into 4 ohms 300 w into 8 ohms and 150+ watts into 16 ohms per channel.
Alternatively if you only have low power amplifiers you could use 2 channels in bridge mode.
One of my old setups used 2 x 16 ohm speakers in parallel to make an 8 ohm load - used on a bridged amp this enabled the amplifier to produce its full rated 4 ohm per channel power.
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Old 23rd November 2012, 01:07 PM   #3
freax is offline freax  Australia
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Can we get a picture of the speaker? maybe that would give us a clue.

Upload it to imgur.com and then copy the link that they give you to here.

If in doubt consider it to be 30 watts RMS max, typically higher ohmage speakers are on the lower end range of power ratings.

As to your question about lowering the ohmage of the speaker, find another 16 ohm speaker and wire it in parallel to the first one.
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Old 25th November 2012, 12:43 PM   #4
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I currently don't have any camera available, though the only code I can see is on the speaker frame, and it reads "T1217 EG21".
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