liquidsun
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Help! Infinity primus 250 - both tweeters dead
commsysman
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liquidsun wrote:

Hello everyone, as the title says both tweeters from my Infinity primus speakers has died. I have the speakers about three years so this is second time a tweeter dying. First time it was year ago and now the other tweeter died as well. This is my setup:

Marantz Pm7003 receiver
Pioneer active subwoofer SW80S
Infinity Primus 250 speakers

And this is how the equipment is wired:

Mostly of the time i listen at normal volume (1/4 of volume knob) but sometimes i listen at very high volume (3/4 and above).
Also, several times has happened the amp to power off automatically while listening at max volume level, but when this happens the amp is never overheated it's always normal temperature.
Could this be the reason for burning my tweeters?

I suggest that you wire the receiver directly to the speakers, rather than going through the subwoofer filter like you are now, as that may be part of the problem.

The amp is probably shutting off due the tweeters having shorted turns in the voice coils, which may be due to listening at very high volume.

If you are going to listen at very high volumes, you need some speakers that are rated for higher power levels.

liquidsun
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Thanks for your suggestion about wiring.

"If you are going to listen at very high volumes, you need some speakers that are rated for higher power levels."

According to speakers manual they are rated to handle 10-150W RMS/8 ohm. My amp is rated at 70wpc/8 ohm.
Why would i need speakers that are rated for higher power levels?

John Atkinson
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liquidsun wrote:
Why would i need speakers that are rated for higher power levels?

I suspect that you are clipping your receiver, which is why it shuts down. When you drive an amplifier into clipping, you increase the power at high frequencies; this is probably why you are destroying the tweeters, which in general have a much lower power rating than woofers.

John Atkinson
Editor, Stereophile

liquidsun
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Thanks Atkinson for your replay. But now i'm even more confused, clipping an amplifier means that the amp attempts to deliver an output voltage or current beyond its maximum capability. So does this means that my apm is not capable of feeding the speakers at max volume so that is why i burn the tweeters. In this case i will need to upgrade my amp instead of the speakers :)

John Atkinson
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liquidsun wrote:
Thanks Atkinson for your reply.

You're welcome.

liquidsun wrote:
So does this means that my apm is not capable of feeding the speakers at max volume so that is why i burn the tweeters. In this case i will need to upgrade my amp instead of the speakers :)

Yes, that's correct. You need to use a higher-powered amplifier so that it will not clip at your preferred listening levels and your tweeters can live to sing another day.

John Atkinson
Editor, Stereophile

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