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Old 29th March 2011, 09:29 AM   #791
AndrewT is offline AndrewT  Scotland
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Some listeners don't need 130dB @ 1m.
122dB @ 1m in exchange for 15Hz lower seems a very good non PA compromise.
115dB @ 1m for a further 10Hz lower would be a nice Home LF speaker. One I would certainly consider.
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Old 29th March 2011, 12:30 PM   #792
jbell is offline jbell  United States
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Quote:
Originally Posted by 4pyros View Post
Thanks thay are starting to get heavy, built like a tank and almost as heavy!
Andy
Yep -- I've built 150lb subs before....

Good progress.
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Old 29th March 2011, 04:52 PM   #793
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Quote:
Originally Posted by CRESCENDO View Post
Weltersys & 4pyros:

Do you have hornresp FR plots for your enclosures? What drivers are you using? I just made (2) SS15's and found your posts re: more lower freq response w/slight changes and my interest was caught immediately
Hornresp can't properly simulate the Keystone sub's mouth.

The actual response curves are detailed in these posts:
Keystone Sub Using 18,15,&12 Inch Speakers

A horn extender gave a 3 dB average increase in forward gain all the way down to the LF corner:

Horn Extender/Wave-guide for TH

This thread compares the Keystone to a BR cabinet:
Tapped Horn Vs. Bass Reflex Case Study

Post #749 in this Single sheet Challenge thread gives more explanation of the Keystone mouth shape, which I think may be my (only) original variant on the TH, which has been mistakenly compared to a Karlson.

Although I have been aware of the Karlson since I was a kid (my dad built a pair for the basement extension speakers from plans in the July 1958 Popular Mechanics magazine) , and built a 15" version in high school, the Karlson shape was not optimum for TH use, though it was one of the many (many) mouth shapes I tried before arriving at the Keystone shaped exit.

Art Welter
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Old 29th March 2011, 06:41 PM   #794
Djim is offline Djim  Netherlands
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An overview of SS15 with old and new 3015lf driver and the SS15 with 18Sound 15W700.
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File Type: jpg HR_SS15_different_drivers_02.jpg (162.7 KB, 506 views)
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Old 29th March 2011, 09:02 PM   #795
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Are you SS15 (and similar) builders using hurricane nuts to secure your drivers?

Went in to hornresp last night to enter in these altered SS15 versions to find my 85+ records gone....hornresp looked like I was using it for the 1st time...ugh

Last edited by CRESCENDO; 29th March 2011 at 09:05 PM.
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Old 29th March 2011, 11:14 PM   #796
Djim is offline Djim  Netherlands
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And another three drivers that will work in the SS15: 18Sound 15ND830 (neo), P.Audio C15-600EL and the 'old' RCF l15P200AK (4ohm version).
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File Type: jpg HR_SS15_different_drivers_03.jpg (160.9 KB, 471 views)

Last edited by Djim; 29th March 2011 at 11:26 PM.
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Old 30th March 2011, 12:47 AM   #797
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grrr the new 3015lf at 40hz looks pretty different and overall it does not preform as well. i mean i guess it will still do a good job in the ss15 box but still, why did they change it?
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Old 30th March 2011, 12:50 AM   #798
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Quote:
Originally Posted by FlipC View Post

mrGsr - NEW 3015LF?
The ones I received are no different than the ones prior. I haven't seen a difference since they went to the neodymium.
yeah i saw someone mention it in another thread. and djim simmed the boxes above, there is deff. a difference! from the sims, looks like maybe an inductor may flatten out the response with the new 3015lf?
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Old 30th March 2011, 01:01 AM   #799
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by m R g S r View Post
yeah i saw someone mention it in another thread. and djim simmed the boxes above, there is deff. a difference! from the sims, looks like maybe an inductor may flatten out the response with the new 3015lf?
Maybe you don't have to worry. Actually I think that most measurements and comments you read about the SS15 are coming from 'new' 3015lf versions while the owners don't realise ;-)
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Old 30th March 2011, 01:42 AM   #800
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Quote:
Maybe you don't have to worry. Actually I think that most measurements and comments you read about the SS15 are coming from 'new' 3015lf versions while the owners don't realise ;-)
Ya how would I know? I orderd my in December. Andy
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