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Old 5th April 2013, 04:14 PM   #21
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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.
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Old 5th April 2013, 04:35 PM   #22
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I should have stated "over-stuffed" in my reply, as stuffing the entire enclosure is perfectly acceptable. It was late.

jeff
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Old 5th April 2013, 04:39 PM   #23
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I know that feeling. I was awake at 0340 today listening to my own brain bake...
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Old 6th April 2013, 03:33 AM   #24
xrk971 is offline xrk971  United States
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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
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Old 6th April 2013, 08:32 AM   #25
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I hope not re the latter, given that it will completely foul up the alignment.
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Old 6th April 2013, 12:24 PM   #26
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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.
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Old 6th April 2013, 02:40 PM   #27
zman01 is offline zman01  Bangladesh
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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.
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Old 6th April 2013, 03:01 PM   #28
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Scottmoose View Post
I hope not re the latter, given that it will completely foul up the alignment.
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?
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Old 6th April 2013, 04:23 PM   #29
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Quote:
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.
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[s], which I hope you will forgive / permit me keeping to myself.

Quote:
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?
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
Attached Images
File Type: png SP12P.png (72.4 KB, 207 views)
File Type: png Messed up SP12P.png (76.4 KB, 203 views)

Last edited by Scottmoose; 6th April 2013 at 04:43 PM.
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Old 6th April 2013, 05:01 PM   #30
xrk971 is offline xrk971  United States
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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.
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