Hi,
There was utterly no point in being obtuse about the speakers in question.
Presumably these : Zaph|Audio - Dayton B652 Tests and Modifications
Your right though, don't waste your time "improving" them.
rgds, sreten.
http://sites.google.com/site/undefinition/diy (see if nothing else, the excellent FAQs)
The Speaker Building Bible - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Zaph|Audio
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
FRD Consortium tools guide
http://web.archive.org/web/20090902124715/http://geocities.com/woove99/Spkrbldg/DesigningXO.htm
RJB Audio Projects
http://web.archive.org/web/20090902202231/http://geocities.com/woove99/Spkrbldg/
Speaker Design Works
HTGuide Forum - A Guide to HTguide.com Completed Speaker Designs.
A Speaker project
DIY Loudspeaker Projects Troels Gravesen
Humble Homemade Hifi
Quarter Wavelength Loudspeaker Design
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
Linkwitz Lab - Loudspeaker Design
Music and Design
Great free SPICE Emulator : SPICE-Based Analog Simulation Program - TINA-TI - TI Tool Folder
There was utterly no point in being obtuse about the speakers in question.
Presumably these : Zaph|Audio - Dayton B652 Tests and Modifications
Your right though, don't waste your time "improving" them.
rgds, sreten.
http://sites.google.com/site/undefinition/diy (see if nothing else, the excellent FAQs)
The Speaker Building Bible - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Zaph|Audio
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
FRD Consortium tools guide
http://web.archive.org/web/20090902124715/http://geocities.com/woove99/Spkrbldg/DesigningXO.htm
RJB Audio Projects
http://web.archive.org/web/20090902202231/http://geocities.com/woove99/Spkrbldg/
Speaker Design Works
HTGuide Forum - A Guide to HTguide.com Completed Speaker Designs.
A Speaker project
DIY Loudspeaker Projects Troels Gravesen
Humble Homemade Hifi
Quarter Wavelength Loudspeaker Design
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
Linkwitz Lab - Loudspeaker Design
Music and Design
Great free SPICE Emulator : SPICE-Based Analog Simulation Program - TINA-TI - TI Tool Folder
This would more likely be due to corner reflections from the driver than the port. It may not take too great a position change to make this less of a problem.
Unfortunately, the position they are presently in is the only practical spot to place them. They are placed on either side of my TV stand which is in a corner.
There is no place else to move the speakers to even if I wanted to.
BTW, just yesteday, I got a the phone number of the old friend who I sold my old equipment to many years ago. We had lost contact with each other and had a real long coversation about old times. My number is unlisted and I will change that soon!
Anyway the sys consited of a pair of JBL L100 speakers, Heahtkit AA1640amp, HK preamp, HK EQ etc. He stiil has it (packed away now). I orginally told him if he ever wanted to sell it, I would buy it back and not to sell it to anyone else. That was over 30 years ago and he said yesterday I could have it all back if I wanted it!
However, I told him that I no longer had the place or room for it in my present apt.
So, you see my placement problem.
There is no place else to move the speakers to even if I wanted to.
BTW, just yesteday, I got a the phone number of the old friend who I sold my old equipment to many years ago. We had lost contact with each other and had a real long coversation about old times. My number is unlisted and I will change that soon!
Anyway the sys consited of a pair of JBL L100 speakers, Heahtkit AA1640amp, HK preamp, HK EQ etc. He stiil has it (packed away now). I orginally told him if he ever wanted to sell it, I would buy it back and not to sell it to anyone else. That was over 30 years ago and he said yesterday I could have it all back if I wanted it!
However, I told him that I no longer had the place or room for it in my present apt.
So, you see my placement problem.
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Only moving them 2 inches at a time can make small but important differences, but you have other options. You can place absorbers around the speakers to control reflections and you'll want to aim the speakers to find the better axis to listen on, which will also have an effect on reflection control.
I believe I've solved my problem, for the most part anyway.
My L/R main speakers are a pair of Polk "monitor 30 Series II" speakers which actually have pretty good mids and smooth high freqs.
BTW, I got them on stands about 12" off the floor. Also, I got them positioned upside down so the tweeters are on top. Why Polk put the tweeters on the bottom is a mystery to me.
My sub in a Dayton "sub 80" that has a Tang Band "W8-740P" speaker in it which is a great improvement over the stock speaker.
However, I still had that peak from the rear of ports of the Polks.
I just removed the Tang Band from the sub and decided to add a bit of "foam" to the sub's interior. On the sub's bottom between the two port tubes, there was bare wood with a few sharp edge braces etc. So, I cut a piecs of egg crate foam rubber (4"x11") from and old mattress pad to fit that area, It was a friction fit.
Then, I replaced the speaker.
The result was a bit of acoustical magic!
The bass from the sub is now tighter. I then just increased the sub's freqs slightly for the hi -pass to the Polks and everthing now sounds much better with no changes to my EQ settings. Before, when I increased the freqs to the sub, it did not sound right.
I'm surprised that just a small piece of "foam rubber" made such an improvement.
My L/R main speakers are a pair of Polk "monitor 30 Series II" speakers which actually have pretty good mids and smooth high freqs.
BTW, I got them on stands about 12" off the floor. Also, I got them positioned upside down so the tweeters are on top. Why Polk put the tweeters on the bottom is a mystery to me.
My sub in a Dayton "sub 80" that has a Tang Band "W8-740P" speaker in it which is a great improvement over the stock speaker.
However, I still had that peak from the rear of ports of the Polks.
I just removed the Tang Band from the sub and decided to add a bit of "foam" to the sub's interior. On the sub's bottom between the two port tubes, there was bare wood with a few sharp edge braces etc. So, I cut a piecs of egg crate foam rubber (4"x11") from and old mattress pad to fit that area, It was a friction fit.
Then, I replaced the speaker.
The result was a bit of acoustical magic!
The bass from the sub is now tighter. I then just increased the sub's freqs slightly for the hi -pass to the Polks and everthing now sounds much better with no changes to my EQ settings. Before, when I increased the freqs to the sub, it did not sound right.
I'm surprised that just a small piece of "foam rubber" made such an improvement.
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Great find. It may not be clear whether you've fixed the problem directly, or compensated for another one...but if you like it, that's what counts. So what did you do? You may have changed a reflection/mode within the box, you may have altered the tuning of the box, and/or you may have altered the phase relationship of that unit.
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