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In Reply to: RE: a thought - posted by hifitommy on June 19, 2016 at 17:34:31
My cabinets were too thrashed to repair so I made new ones (heretical, I know, but I reasoned this fate was better than the speakers living in a landfill, which is where they were headed before I found them).
The new cabinets are the same volume as the old. Making some minor adjustments to the baffle size and moving the aperiodic vent to the rear made room for the Vifa D25AG. I still prefer the sound with the grill cloths on, too :)
"Lesser artists borrow, great artists steal." Igor Stravinsky
Edits: 06/21/16Follow Ups:
i am wondering where the aperiodic port resides on your cabinet. without it, its not the same bass loading.
...regards...tr
The aperiodic vent was moved to the back baffle. It has the same foam loading and surface area as the original one.
"Lesser artists borrow, great artists steal." Igor Stravinsky
Did I ask if there is a great difference in sound with the rear port?
...regards...tr
The in-room bass response is still good and sometimes surprising with a tube amp or the current capacitively-coupled SS receiver that it's paired with. The cabinets are internally braced much more than the originals, and I've often thought that the bass is noticably tighter now. But regarding the aperiodic vent location, I think there's not a difference at all that I noticed immediately or over time.
"Lesser artists borrow, great artists steal." Igor Stravinsky
Edits: 06/22/16
Jim, I made a few changes to the first pair of A-25s I owned many years ago. Of course the crossover cap was upgraded. And as already mentioned, I removed the tweeter screens which I felt was an improvement. Then I also added cabinet bracing. I glued in 3/4 x 3/4 solid wood braces inside the sidewalls, front to back just above the woofer.
Obviously it was not a quick A/B but I did feel the bass seemed a bit tighter. That pair sounded quite nice and I probably should not have sold them. Given the use and levels I anticipate with my current pair I don't have plans to add bracing.
"The piano ain't got no wrong notes." Thelonious Monk
Yes, that's probably the ideal location for braces in the original cabinets. The front baffle has precious little MDF between the woofer and tweeter!
Perhaps it was one of your posts that inspired me to make sure I braced these as well as I could!
"Lesser artists borrow, great artists steal." Igor Stravinsky
I remember seeing one in a post some time ago. Did you build them with mirror image?
"The piano ain't got no wrong notes." Thelonious Monk
Why thanks very much! Yes, I built them in mirror image and re-used the original stuffing although I changed out the binding posts and hard-wired the resistance I preferred for the tweeter (to replace the adjustable level control in the originals).
Jim
"Lesser artists borrow, great artists steal." Igor Stravinsky
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