Subwoofer impedence - AVS Forum
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post #1 of 3 Old 09-05-2013, 03:57 PM - Thread Starter
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I'm setting up a small, experimental system to play with a class T amp. I want to dig out and use my old Yamaha YST-SW45 as a sub. Of course, the amp does not have a preamp output, so I'll have to wire all the speakers to the sub and wire the amp to the sub inputs. The speakers I am connecting to the sub are 8 ohms, but the sub is only 5 ohms. What "load" does the amp "see" -- 8 ohms or 5 ohms?

Any help appreciated.

Best,

Brian
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post #2 of 3 Old 09-06-2013, 09:12 PM
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Quote:
Originally Posted by briansxx View Post

The speakers I am connecting to the sub are 8 ohms, but the sub is only 5 ohms. What "load" does the amp "see" -- 8 ohms or 5 ohms?

Your Class T amp will only see the 8 Ohm load.
The subs built in amp will isolate the Class T amp from the subs 8" driver, which presumably is around 5 Ohms because the built in amp is rated for 70 Watts output into that impedance.
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post #3 of 3 Old 09-07-2013, 07:02 AM - Thread Starter
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Stereo 2.0, Thank you. I suspected that was the case, but I didn't want to blow the amp based on an assumption. The amp arrives today and I'm looking forward to playing with it.

Best Regards,

Brian
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