Cabinet bracing

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   I haven't built a "bookshelf" speaker this size before and I'm not sure how much bracing to put in. I have two options below, but one may be too much and the other too little, I'm not sure which is best. The cabinet is 10"w, 15 3/4"d, 17"h with 3/4" MDF (~1cu.ft. depending on bracing). My other cabinets were small enough, one piece in the middle was fine. I can also move things around as far as the vent, if needed. Any advise would be greatly appreciated. 

The photo link worked in preview but not after posting. This link may work, if not.. I guess I have no picture. 
https://photos.app.goo.gl/bP8hnXU3GbuuRF88A

 http://imageshack.com/a/img924/8071/bPF7VB.jpg - 

Edited by bgloyalty - 11 January 2019 at 6:26pm

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bgloyalty Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 16 September 2018 Location: NC Status: Offline Points: 10	Post Options Post Reply Quote bgloyalty Report Post Thanks(0) Quote Reply Topic: Cabinet bracing Posted: 11 January 2019 at 6:23pm
	I haven't built a "bookshelf" speaker this size before and I'm not sure how much bracing to put in. I have two options below, but one may be too much and the other too little, I'm not sure which is best. The cabinet is 10"w, 15 3/4"d, 17"h with 3/4" MDF (~1cu.ft. depending on bracing). My other cabinets were small enough, one piece in the middle was fine. I can also move things around as far as the vent, if needed. Any advise would be greatly appreciated. The photo link worked in preview but not after posting. This link may work, if not.. I guess I have no picture. https://photos.app.goo.gl/bP8hnXU3GbuuRF88A http://imageshack.com/a/img924/8071/bPF7VB.jpg - Edited by bgloyalty - 11 January 2019 at 6:26pm

BP1Fanatic Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 02 August 2009 Location: Columbus, Ohio Status: Offline Points: 105	Post Options Post Reply Quote BP1Fanatic Report Post Thanks(0) Quote Reply Posted: 11 January 2019 at 9:47pm
	The 1st enclosure and add a brace for the top & bottom panels.

I-shen Soundboy Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 21 December 2016 Location: Big Smoke Status: Offline Points: 375	Post Options Post Reply Quote I-shen Soundboy Report Post Thanks(0) Quote Reply Posted: 11 January 2019 at 11:10pm
	Bracing cabinets for resonance damping usually entails bracing near the centre of the panels. Bracing at the edges of the panels only reinforces structural integity, does very little for resonances. Given the two examples, the first would be my choice as it braces four panels near their centres.

snowflake Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122	Post Options Post Reply Quote snowflake Report Post Thanks(0) Quote Reply Posted: 11 January 2019 at 11:56pm
	brace 40-45% of the way across panels. connect sides to opposite sides. support the far end of that vent.

bgloyalty Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 16 September 2018 Location: NC Status: Offline Points: 10	Post Options Post Reply Quote bgloyalty Report Post Thanks(0) Quote Reply Posted: 13 January 2019 at 11:31pm
	Thanks for the advice. I've gone with the first (nearest) option and have added a vertical brace connecting the top and bottom panels like the horizontal brace forming a cross in the middle. I didn't size the vent correctly for this image and it is only 6 inches flare to flare, but I will consider support for it in the plans.