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Speaker Sensitivity Question...

I was doing the calculation for desired output of a speaker at a distance and the total watts that would be required to get you there. The 1 watt at 1 meter to efficiency to the speakers in db one.

The calculation adjust for the distance of your listening position as a variable.

But what about when you crossover the speakers to a dedicated subwoofer? Isn't the lower frequencies where the majority of you amp wattage gets used up?

So it would stand to reason if you eliminate the lower frequencies from your speaker (from crossing them over to a dedicated sub) that would "free up" those watts and your speakers would not need as many watts to play a desired level.

Is there a calculation for this adjustment?
Am I wrong in assuming this?

Thank you,
Bill
baranowski

Showing 3 responses by baranowski

baranowski OP
240 posts
 
So, I take it that even though my processor is crossing over at 80hz to the powered subs, I gain nothing as far as watts that I would still need for a given db level.

I was hoping it would help.

On a side note. For rear speakers is surround sound... do I need to follow the same amp needs as a front speaker? Or can I get away with a lower watt amp for them?

Bill
baranowski OP
240 posts
 
I currently run...

B&W 802d fronts.
Htm1 center
802n rears.

Anthem statement p5 amp
Marantz 8801 processor

I am looking to add
B&W 804's
And a pair of monitor 600 series.

So I was making sure that...

1. My anthem amp can make the 105 db for thx specs.
2. What kind of head room do I want to try and acheive.
3. What amp do I need for the 6,7,8,9, channels... I eventually only want to use 804 speakers for the remainder of the system.

Thanks
Bill
baranowski OP
240 posts
 
Thank you for your input...

For clarification, and I missed putting this in last post.

I have 3 subs.. 1 paradigm servo 15 and 2 Rythmik 15's...

Also my anthem powers my Fronts center and rear channels. I do not bi amp or anything of the sort.

The new amp (s) would be just for the 804's

Sorry for the confusion if there was some.

Bill
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