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Old 18th July 2013, 05:03 AM   #1
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Default question about ohms

Hi, i have a sony xm-1652z amp that does

165 x 2 @ 4 ohms

200 x 2 @ 2 ohms

And 400 x 1 @ 4 ohms bridged

I want to hook it to a 15 watt bogen speaker ( bogen.com/products/pdfs/hornspeakerpdfs/SPT15As.pdf )

So if i put the speaker on the 45 ohm setting, and hook it up to one side, then the amp at 45 ohms would be putting out around 15 watts right?, could this work as a intercom type loudspeaker? ( i havent figured out the microphone yet)
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Old 19th July 2013, 12:04 AM   #2
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Doesn't work that way. The Bogen has a transformer in it so that when you hook it up to an amp that has a 70 VOLT tap you can select how much of amps wattage ends up at that particular speaker.

IOW, if you had a commercial amp with a 70 VOLT tap that was rated at 30 watts and if you had four of the Bogens you could connect them in series, set each to the 7.5 watt setting. In this way the 30 watts is split equally to the four speakers. If you needed one of them to play louder you would set it at 15 watts and the other three at 3.8 watts, thus dividing up the wattage as needed.

Your Sony does not have a 70 VOLT tap so using it would be problematic at best.

If you had the Bogen without the rotary tap knob than you could hook it up to your amp as you could treat it like any other 8 ohm speaker.

Last edited by jjrenman; 19th July 2013 at 12:07 AM.
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Old 19th July 2013, 12:29 AM   #3
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That amp is way big enough to act as a 70 Volt amp when driving a 15 Watt speaker (and probably a lot more Watts). Hook the amp up to the 70V terminals on the speaker's transformer and hook the voice-coil to the 15W terminals.
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