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Old 14th February 2013, 01:07 AM   #51
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He has stated it in the keystone thread hasn't he?
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Old 14th February 2013, 01:08 AM   #52
NEO Dan is offline NEO Dan  United States
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I think you are correct. I was just off looking for that but couldn't remember where...
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Old 14th February 2013, 01:23 AM   #53
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In the thread Maxo posted a link to (guess Maxo isn't reading anything lol)

"The BC18SW115 in the test box are pictured next to a box exactly double the size of the 2x12.
That box, the Keystone sub, is about 6 dB more efficient than the bass reflex designs using either the Lab 12 or the BC18SW115-4 with the same low corner."
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Old 14th February 2013, 01:42 PM   #54
maxo is offline maxo  United States
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Quote:
Originally Posted by m R g S r View Post
In the thread Maxo posted a link to (guess Maxo isn't reading anything lol)

"The BC18SW115 in the test box are pictured next to a box exactly double the size of the 2x12.
That box, the Keystone sub, is about 6 dB more efficient than the bass reflex designs using either the Lab 12 or the BC18SW115-4 with the same low corner."
Sorry guys, i was reading too much and get sidetracked by the job
( lol ) actually bosses say that you are sidetracked by the "audio crap"...
they dont understand and never will and audio spirit that struggle to be free


so i narrowed my quest to the Keystone and the SS15
now i am wondering if i can cut dimmensions by 2 or 3 inches
on width or deepth and compensate on height to maintain the volume of the box

is there any comparision around here about a keystone and a ss15
btw, there is a cubo sub also around
does anyone have have seen it
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Old 14th February 2013, 02:42 PM   #55
tb46 is offline tb46  United States
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Hi maxo,

"...now i am wondering if i can cut dimmensions by 2 or 3 inches
on width ..."

I did that in the singlesheet thread (singlesheet same as SS15), don't remember where or when, but anyhow, here are comparisons between the Hornresp SPL plot for a standard SS15 v. narrowed boxes (narrowed by 1.5"/3"/5"). (The faint trace in the "background" is the reduced box size SPL.) No make-up necessary. Stay w/ the Eminence 3015LF, and the recommended 1/2"nom plywood.

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Attached Images
File Type: jpg SS15_std_v_1.5_in_braced.jpg (30.7 KB, 62 views)
File Type: jpg SS15_std_v_3_in_braced.jpg (30.9 KB, 61 views)
File Type: jpg SS15_std_v_5_in_braced.jpg (30.5 KB, 61 views)
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Old 14th February 2013, 02:47 PM   #56
maxo is offline maxo  United States
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Thanks oliver,
on the graph with the 5" more narrow cab
you can see a little dip around 100hz of like 2 -3 db
so i can live with that , that dip you can compensate with eq i think right ?
anyway i will cross my tops at 120 or 150 as thye are 12's
THanks Dude you da man for making those graphs possible!!
Max.
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Old 14th February 2013, 03:08 PM   #57
tb46 is offline tb46  United States
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Hi maxo,

As far as eq is concerned the main thing to watch for is the high pass (low cut) to keep the bottom excursion in check.

Just make sure that your speaker fits inside the box. The 3015LF spec sheet says: Overall Diameter 15.32", 389.1mm. :-)

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Old 14th February 2013, 06:21 PM   #58
Juhazi is offline Juhazi  Finland
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According to the sim this woofer has F3 at 50 Hz. Try to get a graph of "Combined spl" output which adds the sound coming from the port at tuning Fq!
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Old 14th February 2013, 06:37 PM   #59
maxo is offline maxo  United States
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Quote:
Originally Posted by Juhazi View Post
According to the sim this woofer has F3 at 50 Hz. Try to get a graph of "Combined spl" output which adds the sound coming from the port at tuning Fq!
and that means ..........
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Old 14th February 2013, 06:44 PM   #60
tb46 is offline tb46  United States
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Hi Juhazi,

If you are referring to the SPL plots in Post #55 they are correct; they are not for a vented (bass-reflex) enclosure, they are for a tapped horn. I recommend you take a look at the Single sheet TH challenge .

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