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Rear ports of M60
#312122 06/27/10 06:43 PM
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I notice there are 2 ports on the rear of my M60s. I didn't receive any foam plugs with my speakers like some other speaker manufacturers use and I was wondering if one is not supposed to plug those to change characteristics.

Is the top port associated with the tweeter and mid while the lower port is associated with the woofers?

My M60s are pretty bright in my room and I was wondering if plugging the top port with foam or whatever would tame that some? Didn't want to plug'em if it is detrimental to the speaker itself so I'm asking here before I try.

Any feedback appreciated.


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Re: Rear ports of M60
edmondwolfman #312125 06/27/10 06:55 PM
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Room treatments would be my first consideration if the speakers were 'bright' in the room ... rugs, furniture or just about any absorbing accent.

Do you have tile or wood flooring?


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Re: Rear ports of M60
RickF #312128 06/27/10 07:01 PM
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I have wood flooring but this is a main living room area so it has furniture, etc. So the regular room treatments that hang on walls etc. isn't going to happen...can you say WAF frown That is why I was wondering if plugging the top port would help. I know that as a general rule the ports on back are plugged to tighten up the base when the room is causing base boom but wondered if the top port was part of the treble and blocking might help.
I know some will say "just try it" but if someone already knows the answer I don't want to waste my time going to the store and buying foam that I don't need.

Last edited by edmondwolfman; 06/27/10 07:03 PM.

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Re: Rear ports of M60
edmondwolfman #312130 06/27/10 07:06 PM
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Edmond, the midwoofers afaik, have their own housing within the cabinet(a cone/cones) and are not vented. The ports are there to extend the bottom end on the woofers, I don't believe plugging them up will do anything to the top end at all and as Rick implied, maybe your room is somewhat reflective.


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Re: Rear ports of M60
Adrian #312136 06/27/10 07:20 PM
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Thanks for the info Adrian. That is what I was afraid of. My room probably is somewhat reflective but I can stand directly in front of the speakers and hear the same thing. When I am playing at a somewhat low volume they sound great as I hear every little cymbal tap, etc. It's when I start to put the volume to them that the highs i.e. cymbals, high frequency instruments and female (high pitched) voices are almost too bright to listen to for long so I was hoping one of the ports would affect that. It's probably just the metal tweeters and my ears but that is what I hear and was hoping to be able to "adjust" it some.

I've had my M60s for a couple of years so its not like it's driving me crazy I would just like to tweak it a bit without having to use room equalization to do so as I like to listen direct or pure direct mostly.

Last edited by edmondwolfman; 06/27/10 07:24 PM.

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Re: Rear ports of M60
edmondwolfman #312138 06/27/10 07:26 PM
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I have M80's and at -10 on my Denon, they start to overpower my room somewhat...also my ears! I have a 3/4 hardwood floor that is half covered by a 1" thick wool rug which I have found to be very helpfull.


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Re: Rear ports of M60
Adrian #312141 06/27/10 07:32 PM
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I was reading an article earlier today and the author was talking about reviewing some speakers, I think epos 50 or similar and said he had to use "run in music and sounds" to try and tame the harshness. Does that make any sense and would that just work on tweeters and mids made from some sort of material other than metal? I've played quite a range of music over my M60s over the last 2 years but never really even heard of "run in" for speakers. I've heard a lot of talk about tubes needing to be played 100 hours or so before they start sounding good but speakers?


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Re: Rear ports of M60
edmondwolfman #312150 06/27/10 07:44 PM
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Run in or break in is bogus. Quite popular with reviewers, audiophiles, and certain high end companies, but the general (although not exclusive) view around here is that it's snake oil. At worst, it's a way of preventing returns...

Ports are pretty much exclusively for bass, so plugging them wouldn't do anything with the treble.


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Re: Rear ports of M60
edmondwolfman #312166 06/27/10 09:23 PM
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The run in (break in) is your ears not the speakers. The mids are crossed over to the tweeters at 2 KHz so they will not contribute to brightness.

If room treatments are not an option, does your avr have tone controls or EQ? you could try taking a little off the trebble to see if that sounds better to you.


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Re: Rear ports of M60
fredk #312168 06/27/10 09:29 PM
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you don't want to plug the port, as you would be defeating the whole purpose of the speaker to filter low frequencies into your room. You don't have to have wall treatments to improve the sound in a room. For the wife factor, just get a nice carpet/throw rug to place between you and the seating area, which will dramatically improve the "brightness" experience in a bright room.


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