SA4512 jbl box not bass reflex |
Post Reply |
Author | |
tkroeker
Registered User Joined: 06 November 2015 Location: kansas Status: Offline Points: 101 |
Post Options
Thanks(0)
Posted: 25 January 2021 at 2:38am |
Theres an SA 4512 cabinet that is a front loaded horn style for a 12 or 15. My question is does anyone know what has to be done to "adapt" the 12 hole to a 15 hole?
Edited by tkroeker - 25 January 2021 at 3:18am |
|
Fsurfer
New Member Joined: 22 January 2021 Location: UK Status: Offline Points: 8 |
Post Options
Thanks(0)
|
Is this the one?
https://www.stageaccompany.com/support/vintage/Sa4512.pdf
Edited by Fsurfer - 25 January 2021 at 8:58am |
|
tkroeker
Registered User Joined: 06 November 2015 Location: kansas Status: Offline Points: 101 |
Post Options
Thanks(0)
|
Yes
|
|
smithshorn
Registered User Joined: 08 February 2007 Status: Offline Points: 253 |
Post Options
Thanks(0)
|
It's a hole for a 15 inch speaker. You simply make an adapter "plate" to make it smaller for a 12. Built more of these than I care to remember.
|
|
smithshorn
Registered User Joined: 08 February 2007 Status: Offline Points: 253 |
Post Options
Thanks(0)
|
http://wizardaudio.hu/hasznos/hangfal%20tervek/top/horn/JBL%2
Edited by smithshorn - 25 January 2021 at 1:56pm |
|
tkroeker
Registered User Joined: 06 November 2015 Location: kansas Status: Offline Points: 101 |
Post Options
Thanks(0)
|
Cool, thanks
|
|
Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
Post Options
Thanks(0)
|
They are not exactly horns, rather 6th order BP with one (kinda) flared port. You can block one or two ports of the four ports to tune the bottom end differently. Depending the use of 12" or 15" speakers and/or the need to have a bit more low extention (at the cost of SPL) or rather more sensitivity higher up (at the cost of low extention). I think it was mentioned in the original JBL documentation of the seventies. I have it somewhere in print, don't have it in .pdf.
|
|
Post Reply | |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |