212 bass

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   Hello everyone,
I have a pair of CHEAP 12" (300watt) speaker which are not used. Since a month I have a new workspace in an empty "warehouse" so I can play music very loud 

I am looking to build a (single) bass speaker. I've build lots of crap earlier but now I have acces to a cnc mill and table saw etc. 

I was looking to the HD215 speakers and was thinking if this is available for 12" (or can I just scale it down)

Does anyone have other ideas. In the link down here are the specs.
http://forum.zelfbouwaudio.nl/download/file.php?id=41244&mode=view

Best Wishes,

Stijn

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fotsi_nijts Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 19 September 2012 Status: Offline Points: 6	Post Options Post Reply Quote fotsi_nijts Report Post Thanks(0) Quote Reply Topic: 212 bass Posted: 21 December 2015 at 1:18pm
	Hello everyone, I have a pair of CHEAP 12" (300watt) speaker which are not used. Since a month I have a new workspace in an empty "warehouse" so I can play music very loud I am looking to build a (single) bass speaker. I've build lots of crap earlier but now I have acces to a cnc mill and table saw etc. I was looking to the HD215 speakers and was thinking if this is available for 12" (or can I just scale it down) Does anyone have other ideas. In the link down here are the specs. http://forum.zelfbouwaudio.nl/download/file.php?id=41244&mode=view Best Wishes, Stijn

mini-mad Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6861	Post Options Post Reply Quote mini-mad Report Post Thanks(0) Quote Reply Posted: 21 December 2015 at 11:36pm
	You want a horn or would you consider reflex too?
	If it sounds like a gorilla is trying to escape, turn it down.

_djk_ Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 5992	Post Options Post Reply Quote _djk_ Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 2:34am
	Very weak motor.
	djk

fotsi_nijts Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 19 September 2012 Status: Offline Points: 6	Post Options Post Reply Quote fotsi_nijts Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 1:01pm
	Since the space where I'm going to use it is pretty big I think I want to build a horn. But this project is also more a building practice. No I've scaled down a USB bass bin so it fits two 12" speakers. I'll try to upload a picture

fotsi_nijts Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 19 September 2012 Status: Offline Points: 6	Post Options Post Reply Quote fotsi_nijts Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 1:34pm
	I'm new to sketchup since yesterday, but worked this out. It's based on a USB Bass Bin. Normally there are two angles in the horn mouth, since the scaling made it impossible to fit the driver in depth I added a slightly wider piece and made it a bit deeper and wider. To be honest I don't know anything about doing calculations.... so not sure how this wil influence it's sound. Pictures below: https://www.flickr.com/photos/138765040@N04/23278880124/ Edited by fotsi_nijts - 22 December 2015 at 1:36pm

mini-mad Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6861	Post Options Post Reply Quote mini-mad Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 3:49pm
	You will lose loads of low bass scaling down a USB. why not have a go at an MTH30 and just build a pair of them, side by side and corner load them. Iv had good results doing this in smaller rooms and medium halls. ....of try your hand at a tapped horn like the THAM12. A few more angle cuts required but you get a smaller box and is a bit more forgivable on the driver used.
	If it sounds like a gorilla is trying to escape, turn it down.

fotsi_nijts Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 19 September 2012 Status: Offline Points: 6	Post Options Post Reply Quote fotsi_nijts Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 9:21pm
	Hi, Thanks for your advice. I've already had them inside two MTH30 and have one THAM10 which sounded really weird. (tested with two different drivers.) I saw this one on the forum but didn't find any plans for it. http://bass.heavy.jp/wp-content/uploads/x2_a57bb81.jpg I play a lot of dub/reggae so I think it's a suitable build.

mini-mad Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6861	Post Options Post Reply Quote mini-mad Report Post Thanks(0) Quote Reply Posted: 22 December 2015 at 11:01pm
	They wont play low.... the path is to short.
	If it sounds like a gorilla is trying to escape, turn it down.

fotsi_nijts Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 19 September 2012 Status: Offline Points: 6	Post Options Post Reply Quote fotsi_nijts Report Post Thanks(0) Quote Reply Posted: 23 December 2015 at 1:16pm
	Alright, last one... Planar Horn?

all bass Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 11 October 2012 Location: the Netherlands Status: Offline Points: 1845	Post Options Post Reply Quote all bass Report Post Thanks(0) Quote Reply Posted: 23 December 2015 at 6:22pm
	JB sub 12 H Seems to work well with higher QTS drivers.
	https://www.instagram.com/my_modular_journey/