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Old 3rd August 2008, 02:29 PM   #1
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Default Help me align this 15 in a vented enclosure?

Hi,

For a while now I've been running (and tweaking) LaScala DIY enclosures under an Altec 902/811 combo. My final intention was to go passive, but I've been holding off because I wanted to make sure that it would sound reasonable using the DCX2496. In other words, I don't want to start dumping boat loads of tweak time and $$ on passive components if the whole thing is going to be unsatisfactory.

I think I've come to the conclusion that it is unsatisfactory. Although the dynamics are amazing, it simply doesn't sound good to me. The issue is definitely (imho) the upper bass trying to make it's way thru that folded horn, and the funny noises that result. I've been everywhere on the xover with all types of alignments.....

Most people say it sounds fine, They aren't hearing what I'm hearing.


So, I think I might want to try a simple vented enclosure a-la Model 19. The woofers I have are built by Eminence to imitate the original K33 Klipsch woofer. The parameters are:

CW1526C cast frame 15" woofer

FS is 26.3, Re is 3.36, VAS is 506.3 Liters, BL is 12.49, QM is 9.93, QE is 0.27, QT is 0.26. Sensitivity is 97 db. Coil is 1 mH.
Pmax is 150 watts. Xmax is 7.15 mm, MMS is 75.5 grams, Cms is 0.486 mm/N

I need to keep things under 5 cubic feet. The enclosures will be close to the rear wall. Vented alignments certainly aren't my forte, and other than just plugging numbers into winIsd and getting the result - I will probably get into trouble.

So, I plugged some numbers into winIsd and here it is. Can it be improved? (of course it can - but how?)

Thanks!

4.5ft^3 / Ql=7 / 2 X 3" vents 7" long
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Old 3rd August 2008, 02:47 PM   #2
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Default 1/2

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File Type: pdf speakershop enclosure module 1.pdf (63.6 KB, 58 views)
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Old 3rd August 2008, 02:49 PM   #3
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Default 2/2

lalala
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Old 3rd August 2008, 03:02 PM   #4
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Choky, You must have had that ready - you mind reader

Thanks!

Looks like WinIsd has similar results to that software. The second one is too big, although it would be nice. Do you think something slightly larger than the first one would be adequate 'in room' for music?

(I don't think 'small' OB is going to give me the impact I am looking for - as I suggested earlier in a different thread)



EDIT and OT:

Lookie looky at the Tuner I found at the Crunchville dump yesterday. It was a 220v unit and I just stuffed a 110 >220 trafo that I had on the floor in the case - walaaaa!

supposed to be a wiked nice tuner...
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Old 3rd August 2008, 03:31 PM   #5
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Quote:
Originally posted by mpmarino
Choky, You must have had that ready - you mind reader

Thanks!

Looks like WinIsd has similar results to that software. The second one is too big, although it would be nice. Do you think something slightly larger than the first one would be adequate 'in room' for music?

(I don't think 'small' OB is going to give me the impact I am looking for - as I suggested earlier in a different thread)



EDIT and OT:

Lookie looky at the Tuner I found at the Crunchville dump yesterday. It was a 220v unit and I just stuffed a 110 >220 trafo that I had on the floor in the case - walaaaa!

supposed to be a wiked nice tuner...

tuner for sissies ........ too much knobs

now I have few issues with my net connection ( too slow) , but soon it works as usual , I'll send ya that proggie I'm using .... so play with it .

of course - completely legal , as soon you buy me a beer ( or it was bear ........ dunno )
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Old 3rd August 2008, 03:48 PM   #6
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give me proper mail addy - not that gmail #$!$$$$$$@%^^^&!%%@%! thing !!
where I can send you rar or zip file

it bounced back

o, how I hate those web mail dreks!
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Old 3rd August 2008, 04:37 PM   #7
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Quote:
o, how I hate those web mail dreks!
Yeah - but it's the only thing that makes it to a Serb from a Yank.....





edit: Two knobs is too much??
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Old 4th August 2008, 11:05 AM   #8
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Hi,

4.5cuft tuned to ~ 30Hz optimises the F-10dB point.
You cannot do much better in a cabinet that size.
The F-6dB point is not compromised, only the F-3dB.
Group delay for ~ 30Hz vs ~ 40Hz is a lot better.

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Old 4th August 2008, 06:06 PM   #9
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Thanks for taking a look.

When I get some time I plan to give it a try - I hope I'm going in the right direction....
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