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#399549 - 12/26/13 01:54 PM Port Plugs - M3 Experiment
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1237
I watched with interest Axiom's latest video ref Port Plugs.

One of my 'audio only' systems (2 x M3s) suffered from ridiculous bass reinforcement due to their placement in corners. This was the case with any brand or model of speakers that I placed there so it is not just an M3 phenomena. To compensate, I had to EQ the bass down on my receiver from '0' to '-6' (out of 10) to try to tame the bloated bass response. It sounded quite good that way; however, I was concerned with what lowering the receiver's bass level was doing to the overall FR of the system.

Hmmmm, says me after watching Andrew's Port Plug explanation so I decided to experiment a little. Being a pack-rat, I found in my stash of 'stuff' in my workshop, some quite dense, but also flexible packing foam (1/2" thick) that had thin cardboard backing glued on. I easily cut with scissors a couple plugs a little bigger than the port diameter & press-fit them firmly into the ports.

I set the receiver back to 'flat' & played some quality CDs. What a difference - any remaining muddiness completely disappeared & overall sound balance morphed from good to superb. Higher volume levels are far more forgiving as well. Rest assured, there was no placebo effect here - the difference was dramatic.

This experiment was so successful, I just may purchase a couple of the 'official' plugs when they become available. Thanks to Axiom for this great tip...

TAM

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#399550 - 12/26/13 02:14 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
radtek2 Offline
old hand

Registered: 08/05/04
Posts: 78
Loc: Yelm, WA
I am wondering about doing this with my VP180. It sits below my plasma monitor on the middle shelf. Being a fellow pack-rat I am going to look around for some suitable material and see how it affects the 180.
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#399558 - 12/26/13 09:28 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8348
Loc: Tacoma
I was really intrigued by the recent video, too.

Specifically, I wondered:

1. whether Axiom will release specifications for various speakers with the port plugs in
2. whether the plugs provided by Axiom are completely airtight or whether they provide an aperiodic box alignment
3. what the real-world ramifications are regarding extension, sensitivity, power-handling, etc.

TAM, thanks very much for sharing your experience.
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#399559 - 12/26/13 09:57 PM Re: Port Plugs - M3 Experiment [Re: tomtuttle]
casey01 Offline
aficionado

Registered: 07/03/08
Posts: 798
Loc: Toronto
Originally Posted By: tomtuttle
I was really intrigued by the recent video, too.

Specifically, I wondered:

1. whether Axiom will release specifications for various speakers with the port plugs in
2. whether the plugs provided by Axiom are completely airtight or whether they provide an aperiodic box alignment
3. what the real-world ramifications are regarding extension, sensitivity, power-handling, etc.

TAM, thanks very much for sharing your experience.


I first saw port plugs as an option used in HSU subs and later their hybrid equivalents from Outlaw that provided a port plug as an option to give a little more bass extension at the lowest levels. With its usage, however, comes a slight reduction in potential SPL output so I assume the concept is similar in the M100 but only in subs and speakers that are capable of low bass extension otherwise, I don't see much value in them.

I have an Outlaw sub with the optional port plug and tried it both ways and honestly, I couldn't hear much if any difference.

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#399595 - 12/28/13 08:35 AM Re: Port Plugs - M3 Experiment [Re: casey01]
FireGuy Offline
devotee

Registered: 10/31/07
Posts: 315
Loc: Buffalo, New York
I have an Outlaw sub with the optional port plug and tried it both ways and honestly, I couldn't hear much if any difference.

I too have an Outlaw sub with that port plug option and concur with the above. After numerous tests with and w/o plug the engaged I could not detect any audible difference. Maybe at relatively high SPL levels but for normal listening, no change.


Edited by FireGuy (12/28/13 08:37 AM)
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FireGuy
M22V3/M3ti/M2V3/Omega Super 5/Aperion 5C/OutlawLFM1+Sub/Denon AVR1906/YamDVDC750/AS AMP110

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#399599 - 12/28/13 12:21 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1237
I can't speak for sub port plugs, but the change in my M3s in their less than ideal placement in the corners of my room was substantial & indeed better...

TAM

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#399707 - 01/03/14 05:49 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4963
Loc: western canada
I want to see some graphs; plugs in, plugs out.
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"Those who preach the myths of audio are ignorant of truth."

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#399710 - 01/03/14 06:38 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1237
chess: If that was directed to me, I don't do graphs; however, I do know what I hear & prefer...

TAM

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#399711 - 01/03/14 06:58 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
brwsaw Offline
connoisseur

Registered: 10/12/12
Posts: 1265
Loc: Canada
Anyone know when Axioms plugs will be ready?
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Living on the iPad these days.

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#399715 - 01/03/14 08:18 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4963
Loc: western canada
Originally Posted By: exlabdriver
chess: If that was directed to me, I don't do graphs; however, I do know what I hear & prefer...

TAM

You need to be a bit less sensitive there Tam.
It was just a general statement that i'd like to see frequency response graphs of plugs in, plugs out to see what kind of difference it makes (with all other variables being equal). I'm sure the good Axiom folk already have such graphs.
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"Those who preach the myths of audio are ignorant of truth."

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#399717 - 01/03/14 08:31 PM Re: Port Plugs - M3 Experiment [Re: chesseroo]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16335
Loc: Leesburg, Virginia
I'd like to see some graphs of people's blood pressure before and after they read your posts, Chess.
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"Hello world." -- Every programmer, at one point or another.

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#401131 - 02/16/14 07:14 PM Re: Port Plugs - M3 Experiment [Re: brwsaw]
Strider53 Offline
veteran

Registered: 04/11/12
Posts: 104
Loc: Detroit
Has there been any word on when the port plugs might be available for purchase?
/Jeff
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Young enough not to care

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#411306 - 04/05/15 10:40 PM Re: Port Plugs - M3 Experiment [Re: exlabdriver]
Lampshade Offline
connoisseur

Registered: 11/08/05
Posts: 1203
Loc: Holbrook, MA
Short Version: I love the port plugs. They made a huge difference.

I did some experimentation with household items and had good success so I ordered the Axiom port plugs. I felt they were overpriced when ordering, but it turns out they are pretty nicely engineered.

I have M80's and I always wondered if I would have been better off with 60s. I have them in a medium to small room and one is in the corner.

Plugging the bottom ports have done wonders. I have more detail in the mid range and cleaner bass.

I purchased two pairs so I could fully experiment. Plugging both ports doesn't work well in my set up. Detail is good, but you can tell something isn't right.

I have a set of M3s, I will try some experiments with those and my "extra set".

I listen to my system everyday. I watch the same scenes from movies all the time so I have references. I use Ratatouille, The Incredibles, and Kill BIll Vol. 2 the most.

It was easy to hear the improvement.

Watch Andrew Welker's video and see if they might help you and do not hesitate to try them.

My favorite Incredibles scene for sound reference: The music while Robert is working out followed by his visit with Edna. (Good video reference too-lots of blacks and whites at Edna's house).

Ratatouille: The stand up bass of the mouse band during the welcome home celebration and Ego's review.

Both movies are filled with so much to listen to.

I like Kill Bill Vol 2 for the dialog in the wedding chapel at the beginning of the movie.
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M3 and Manley Stingray
M80 and Pioneer SC 55

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