How many watts for 5 speakers per channel? - AVS Forum
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post #1 of 8 Old 05-11-2012, 07:11 AM - Thread Starter
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I have Sony AMP can push 90 watts per channel.
I made new speakers cab using 5 speakers.
1 tweeter 75 watts, and 4 of 6.5" mid range speakers 90-180 watts each speaker. how is the watts calculate in this situation?
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post #2 of 8 Old 05-11-2012, 07:13 AM
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what are the ohms rating of the speakers? Do you have a crossover in the cabinet?
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post #3 of 8 Old 05-11-2012, 08:10 AM - Thread Starter
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Quote:
Originally Posted by stormwind13 View Post

what are the ohms rating of the speakers? Do you have a crossover in the cabinet?

8 ohrms speakers. yes i'm using 3 ways crossover
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post #4 of 8 Old 05-11-2012, 12:11 PM
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Ehh, power ratings are just a loose guideline. For example, a subwoofer rated for 2000w will handle quite a bit more power than a tweeter rated at 5w. And that's about all it tells you. Just a heads up though, you will likely burn the tweeter with a 75w sine wave at 10khz for an extended period of time, but the system as a whole will likely handle a 300w white noise burst of 10ms. So, you can ruin your speaker with 75w, but not with 300w. That statement makes no sense, and neither does trying to come up with a power rating.

YID DIY
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post #5 of 8 Old 05-11-2012, 03:08 PM - Thread Starter
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Quote:
Originally Posted by Looneybomber View Post

Ehh, power ratings are just a loose guideline. For example, a subwoofer rated for 2000w will handle quite a bit more power than a tweeter rated at 5w. And that's about all it tells you. Just a heads up though, you will likely burn the tweeter with a 75w sine wave at 10khz for an extended period of time, but the system as a whole will likely handle a 300w white noise burst of 10ms. So, you can ruin your speaker with 75w, but not with 300w. That statement makes no sense, and neither does trying to come up with a power rating.

Thanks.
Another question, I have 4 mid range speaker and what happen if i use 2 of them for sub and 2 of them for mid? since i have 3 way crossover?
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post #6 of 8 Old 05-11-2012, 03:59 PM
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It depends on your speakers.

If you're using all hornloaded drivers that get ~95dB/w, you'd only need ~64w of clean power to drive them past reference level.
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post #7 of 8 Old 05-14-2012, 09:51 AM
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How many Watts? That depends...

Wattage capability of the speakers?
Looneybomber addressed that - add the mfr's rating if using dual drivers, and then take a big dose of windage as you really don't know if the mfr's rating was with highly variable program (music) or test tones.

Watt's to hit a sound level?
Poorman's getting at it. You need the speaker sensitivity, the room size, and where you're sitting relative to speaker placement. From there, it's your choice of average level and headroom.

AVR power a good match to the speakers?
The first point is what most folks think about, ratings comparison, and they're wrong in thinking that "the speakers are rated higher than my amp, so I won't blow speakers." That's looney's point... there are stress conditions where an amp can blow a speaker rated higher than the amp.

The useful answers start with "how loud can it get" but only if you ask:
"how loud can it get at 0.1% of available power."
- 0.1% because you want 30dB of peak headroom on the average amp output
- "available" power because we're talking peaks, and peak power output is well above RMS ratings.

Keep in mind that this is still only half the answer; how loud you want and room size are big factors and speaker sensitivity is the critical parameter. That's your call, but these are some guidelines. Just trust your ears and turn it down when it starts to sound bad.

Have fun,
Frank
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post #8 of 8 Old 05-15-2012, 10:51 AM
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I hope you like fiction.

Because Sony receive/amp power ratings are just that - fiction.

Even their ES line receivers rated for ~120 w/ch only deliver about 35 W/ch with all channels driven
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