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Re: Any reason i should use a sub with the M80's?
terzaghi #345316 04/17/11 06:43 PM
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Yeah, seems strange to me, but what do i know. I haven't bought new speakers in 25 years..LOL The Polks are pretty easy to place and 1' off the back wall and 1' off the side wall works fine for these. The M80's on the other hand, people seem to think placement will effect the sound stage big time. Guess i should just start with my stock placement and see what happens.

The Polks need to face strait ahead. Maybe the M80's need a little toe out, or in..sort of speak, to make the soundstage right? But again..I have no clue.

Re: Any reason i should use a sub with the M80's?
bobt #345321 04/17/11 07:21 PM
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The old Polks are a different type of speaker. They do fill the room with sound. But i see no reason the M80's should not do the same. The cab dimentions are different, as the Polks are a tad higher at 44" and wider. But the M80's are a lot deeper at 17".

I'm not sure that the total cab volume is not close on both.
The port thing i have no clue about. The placement....I'm not sure about. I see no reason why i should not fire these strait ahead, like the polks. To fill the room with sound. The placement on the back wall may be an issue...that makes more sence to me. But again, all i can do is try them out in my stock position..then work from there.

Re: Any reason i should use a sub with the M80's?
bobt #345323 04/17/11 08:29 PM
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"But again, all i can do is try them out in my stock position..then work from there."

That is a very good idea.

And nobody says that you have to dial them in in 20 minutes. Take your time, experiment. Most important thing is to enjoy the experimentation and not to fre too much about it.


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Re: Any reason i should use a sub with the M80's?
Lampshade #345326 04/17/11 09:44 PM
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It depends on what you are measuring FOR. Rick's right in that the distance from the center/front of the woofer to the floor, to the side wall and to the rear wall matter (theoretically). You're not supposed to have any two of those the same, IIRC.

I'd agree that when most people are talking about distance "behind" the speaker, they are probably talking about from the wall to the back of the speaker. A foot is way plenty for the ports.

Most people think a little toe-in can be beneficial. You just have to experiment in your room.


bibere usque ad hilaritatem
Re: Any reason i should use a sub with the M80's?
bobt #345349 04/18/11 02:06 AM
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Bob, this is very basic and has been discussed here(and elsewhere)many times over the years. The sound comes from the center of the drivers, not from the side or back of the enclosure. To minimize the peaks and valleys from reflections from the nearest room surfaces(two walls and floor)piling up at the same frequencies, distances from them to the center of the woofer cones should be unequal.


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Re: Any reason i should use a sub with the M80's?
Wid #345380 04/18/11 05:31 PM
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Originally Posted By: Wid

Just a note; when measuring speakers for placement you should be measuring from the back wall to the front (baffle) of the speaker. On side wall measurements you go from the wall to the center of the driver.


That is how I have heard to measure as well.

Re: Any reason i should use a sub with the M80's?
davidsch #345382 04/18/11 05:48 PM
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Another tip that I am currently using works for rectangular rooms. Take the distance from the front of the speakers to the front wall and multiply by 1.6 to get the distance that the speakers should be from the side walls. If your speakers are one meter from the front of the speaker to the front wall, put the speakers 1.6 meters from the side walls. I understand that this may not be possible due to having to place the speakers on a long wall instead of a short wall or because of furniture placement, etc. Try it if you can.

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