I heard the A12P in the Superpensils (and bought the drivers afterwards based on this performance). In that demo the bass did start at around 50 hz (intuitively, we didn't measure), it had enough bass for most music.
So indeed it could be due to your stuffing.
So indeed it could be due to your stuffing.
I should have stated "over-stuffed" in my reply, as stuffing the entire enclosure is perfectly acceptable. It was late.😀
jeff
jeff
Ron,
Any luck with adjusting the stuffing or have you tried the 10.5 in x 2.55 in piece of cardboard shelf vent?
Curious to see if it worked.
Good luck fixing it...
X
Any luck with adjusting the stuffing or have you tried the 10.5 in x 2.55 in piece of cardboard shelf vent?
Curious to see if it worked.
Good luck fixing it...
X
Taking some stuffing out has helped some but I think i need to open up the backs and do a full readjust because its not evenly spread out. Will be doing that today after I get back from the record store.
Ron,
Yes, better to take it all out and start afresh. Pls make sure that the dacron/acousta stuff is nicely fluffed up; don't get the hollow-fill fiber too close to the drivers. Start with smaller quantities at first and then add as/if required.
Yes, better to take it all out and start afresh. Pls make sure that the dacron/acousta stuff is nicely fluffed up; don't get the hollow-fill fiber too close to the drivers. Start with smaller quantities at first and then add as/if required.
I know that this would change the alignment from the design. But if the OP was looking for more bass, then the intended alignment may not be what he was looking (or listening) for. My suggestion was just to see if an alternate alignment with a little more bass extension would be to his liking and since it is easy to cut a piece a cardboard and is fully-reversible, I do not see the harm.
Btw, what do you mean when you say 'pro-audio alignment'? Flat response like a studio monitor or sound style similar to a PA system used by a DJ?
Pulling damping and tuning the box to a lower frequency per your recommendation will unfortunately mess things up. The pensils are designed to achive a specific alignment (with a degree of adjustability for rooms / amplifier output impedance / personal taste built in); if you want to change Fb however, you'll need a different box I'm afraid. For the sake of confirming what you've presumably already discovered when you put the cabinet in question through WinISD, they have nothing in common with any T/S volume alignment you are likely to encounter. They are derived from my own alignment
The second is heading in the right direction. I described the general alignment above, and in various other threads. Basically, the pensils are tuned to provide relatively broad-band gain through the midbass region (depends on the specific alignment I used, which of course depends on the drive unit), a relatively unreactive impedance load and linear drive unit deflection akin to a transmission line. On the left is the cabinet as designed. For interest, on the right is the box modified as you suggest above. I've seen (much) worse than the latter, but it's not one I'd recommend.
Cheers
Scott
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Thanks for running the sim with the extended shelf port. It does give it a rather big boost in the low bass emphasis and I agree your original design looks nicer.
I imagine it's the same folks that believe that the pioneers of audio were mostly working 'in the dark' before the 'age of enlightenment' that T/S filter design theory ushered in..........
GM
I think you might have a point there... 😀 Olson, Beranek, the Altec / W.E. enginers et al were, after all, renowned for knowing nothing. 😉
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Someone mention my name?
OK, I believe that you mean "The Other Olson"....darn it! Nobody ever calls either.
Best Regards,
TerryO
So there are some big improvements in sound by removing a lot of the stuffing that I had in there. That said I am going to rig up some rope to keep the stuffing in place.
Another idea I had was to add speaker spikes to the bottom of the speakers.
Right now they sit directly on my tile floor.
Another idea I had was to add speaker spikes to the bottom of the speakers.
Right now they sit directly on my tile floor.
Ron,
If you have the holey bracing in place that should help keep the stuffing in place?
Hard tiled floor should be good enough, but I have read that spikes help in "tightening" up the bass.
If you have the holey bracing in place that should help keep the stuffing in place?
Hard tiled floor should be good enough, but I have read that spikes help in "tightening" up the bass.
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