ATC 15" loaded general purpose bass / kick box.

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   Hello.

I would be very grateful for some help with BR calculation. I've got 4 15" drivers (ATC PA100-375BLC / Martin l1540). The desired box would be a general purpose bass bin to cover typical range of ~40-120Hz (plus in other configuration to act as kick/midbass ~90-250Hz). External dimensions need to be: 572mm x 500mm. Depth of the box is to be calculated as well as the ports. I wish to make them in all four corners of the box (triangle shape, something similar in appearance to the Martin Blackline s15).

When I type the specs of the driver to a calculator, it gives me weird values, eg. box volume = 17.3l :)

Here is the calculation shot:

Here are the driver specs:

I don't know if these drivers are really suitable for BR loading. Martin used them in their bass horns mainly. However, they made also some floor monitors, in which these drivers were reflex loaded.

Any advice welcome and appreciated.

Thanks,
Tom

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audiofun Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 25 January 2012 Status: Offline Points: 110	Post Options Post Reply Quote audiofun Report Post Thanks(0) Quote Reply Topic: ATC 15" loaded general purpose bass / kick box. Posted: 27 May 2015 at 9:40pm
	Hello. I would be very grateful for some help with BR calculation. I've got 4 15" drivers (ATC PA100-375BLC / Martin l1540). The desired box would be a general purpose bass bin to cover typical range of ~40-120Hz (plus in other configuration to act as kick/midbass ~90-250Hz). External dimensions need to be: 572mm x 500mm. Depth of the box is to be calculated as well as the ports. I wish to make them in all four corners of the box (triangle shape, something similar in appearance to the Martin Blackline s15). When I type the specs of the driver to a calculator, it gives me weird values, eg. box volume = 17.3l :) Here is the calculation shot: Here are the driver specs: I don't know if these drivers are really suitable for BR loading. Martin used them in their bass horns mainly. However, they made also some floor monitors, in which these drivers were reflex loaded. Any advice welcome and appreciated. Thanks, Tom

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 28 May 2015 at 1:12am
	I would stick to using them in horn loaded kick bins or mid-tops/wedges. They're not ideally suited to a reflex sub. You'd probably find they'd need a lot of EQ to flatten out the bottom end.

jerronimo Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 July 2009 Location: Nederland Status: Offline Points: 438	Post Options Post Reply Quote jerronimo Report Post Thanks(0) Quote Reply Posted: 28 May 2015 at 7:49am
	stick m in a cubo15, it's a very forgiving design and works with a wide range of drivers. Got the 12 inch atc75-314 bass myself and buiding cubo12's for them as we speak. Will post a buildlog soon as they are almost finished.

audiofun Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 25 January 2012 Status: Offline Points: 110	Post Options Post Reply Quote audiofun Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 1:01pm
	Hey, I'm still struggling with this design. Could anyone help with advice, please, on how to modify HD15 to make it play nicely up to 250Hz? I think if the box was close to the TSE115 and loaded with the PA100-375blc it would cover well the required spectrum: 50-250Hz. Am I wrong? Any advice welcome and appreciated. Thanks, Tom PS. Jerronimo, how is your Cubo12 project going? Edited by audiofun - 21 January 2016 at 1:02pm

Mikkel Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549	Post Options Post Reply Quote Mikkel Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 1:09pm
	You would be better off making the bph 238 but even that may struggle up to 250hz. Reaching up the youd want something with less of a front chamber, like the martin 115, i believe it goes up that high, not my personal experience but just want ive read. Hope that helps

cravings Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7442	Post Options Post Reply Quote cravings Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 1:34pm
	the "bph238" is the plan for the turbosound tb215.. they did used to run them up to 250hz alright.. i've always been curious to try the atc drivers in them to see how they do.

audiofun Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 25 January 2012 Status: Offline Points: 110	Post Options Post Reply Quote audiofun Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 1:53pm
	Hi, Yes, the 238 seems to be the route for me, thanks for that link. Just a question: could the front of the box be rescaled to 572mm x ~500mm? I really need the 572 dimension to have well looking stack ;) EDIT: forgot to mention, will make a single 15 boxes, stacked as a pair on top of a 18" sub. Edited by audiofun - 21 January 2016 at 1:55pm

Mikkel Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549	Post Options Post Reply Quote Mikkel Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 2:00pm
	I see, thats good to know. Ive always liked the look of the design over on hornplans.fr.

madboffin Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1538	Post Options Post Reply Quote madboffin Report Post Thanks(0) Quote Reply Posted: 21 January 2016 at 4:18pm
	Some of the very first Turbosound TMS3's were fitted with the ATC 15 BLC and the reasons for changing to custom spec Fanes were cost and exclusivity, not performance. A TB215 is the same as the low section in a TMS3, so it should work OK.