Dual B&C 21DS115-4 Build - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 88 Old 07-13-2019, 04:00 AM
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I don't see any bracing running across the back panel of the enclosure other than around the outer edges.....its seems to me this is leaving a quite large central area unbraced. Maybe two shallow braces across the center perpendicular to each other and then expanding outwards towards the baffle as you clear the driver.
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post #62 of 88 Old 07-13-2019, 04:50 AM
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Since that's the area of the port, the port itself should add quite a bit of panel stiffness, especially with 4 runners.
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post #63 of 88 Old 07-15-2019, 07:39 AM - Thread Starter
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Yeah I was thinking the port rails should add a lot of stiffness to the back port panel. Although I will probably add some more bracing on there anyway, better to be over braced than under!

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post #64 of 88 Old 07-18-2019, 05:30 AM - Thread Starter
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Drivers arrived, however they've sent me an 8ohm and 4ohm instead of 2 4ohms, nothing is ever straightforward!

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post #65 of 88 Old 07-18-2019, 07:12 AM
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Drivers arrived, however they've sent me an 8ohm and 4ohm instead of 2 4ohms, nothing is ever straightforward!



The 8 ohm 21DS115's have slightly less motor strength than the 4 ohm drivers. In practice, you might have a little less than 3 dB loss in output vs the 4 ohm drivers. I wouldn't sweat it, unless they have a free return policy.

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post #66 of 88 Old 07-18-2019, 07:50 AM - Thread Starter
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The 8 ohm 21DS115's have slightly less motor strength than the 4 ohm drivers. In practice, you might have a little less than 3 dB loss in output vs the 4 ohm drivers. I wouldn't sweat it, unless they have a free return policy.
I've emailed and they said they would send the 4ohm no problem, and are picking the 8ohm up tomorrow, the ocd in me wouldn't want a mix!
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post #67 of 88 Old 07-18-2019, 03:00 PM - Thread Starter
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Breaking them in!

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post #68 of 88 Old 07-19-2019, 05:21 AM - Thread Starter
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Managed to fit window bracing onto the cut sheet so may aswell use them. Final design, getting the wood cut this weekend! Also forgot to mention, will the port rails not running flush to the baffles cause any issues, they are set 2" deep into the port as I prefer this look aesthetically?
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post #69 of 88 Old 07-19-2019, 05:35 AM
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Managed to fit window bracing onto the cut sheet so may aswell use them. Final design, getting the wood cut this weekend! Also forgot to mention, will the port rails not running flush to the baffles cause any issues, they are set 2" deep into the port as I prefer this look aesthetically?

I would not worry too much about the port rails. If anything you might bump your tune up a couple tenths of a Hz. If it was modeled on WinISD it will probably come in a touch low anyway
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post #70 of 88 Old 07-21-2019, 04:58 AM - Thread Starter
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Got some of the bigger cuts done at local diy store, waiting on a new circular saw and router to do the rest, should be here by midweek. Also got the cables made as the drivers I've got have the spade terminals not springs!

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post #71 of 88 Old 07-21-2019, 05:36 AM
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Those subs are going to be killer! Can't wait to see more progress.

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post #72 of 88 Old 07-21-2019, 01:47 PM - Thread Starter
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ETA for saw and router is Thursday so no action until then, after that should be pretty fast turnaround. Thinking around a week.

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post #73 of 88 Old 07-25-2019, 05:25 PM
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Managed to fit window bracing onto the cut sheet so may aswell use them. Final design, getting the wood cut this weekend! Also forgot to mention, will the port rails not running flush to the baffles cause any issues, they are set 2" deep into the port as I prefer this look aesthetically?
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post #74 of 88 Old 07-26-2019, 12:07 PM - Thread Starter
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Second driver arrived, saw and router arrived, however rain has also arrived!
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post #75 of 88 Old 08-04-2019, 07:27 AM - Thread Starter
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Finally got all the wood and baffles cut, just got to do the bracing and start gluing!

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post #76 of 88 Old 08-04-2019, 07:28 AM - Thread Starter
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post #77 of 88 Old 08-04-2019, 08:17 AM - Thread Starter
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Mock fit, all looks good!

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post #78 of 88 Old 08-05-2019, 07:13 AM - Thread Starter
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Started gluing, boxes should be ready by the end of the week hopefully!

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post #79 of 88 Old 08-06-2019, 08:20 AM - Thread Starter
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Bracing started, what an absolute pita!

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post #80 of 88 Old 08-06-2019, 08:28 AM - Thread Starter
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Looks good and is very sturdy but takes ages!

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post #81 of 88 Old 08-06-2019, 12:25 PM - Thread Starter
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Like a glove!

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post #82 of 88 Old 08-14-2019, 03:30 AM - Thread Starter
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Bit more progress but going slowly! Should have them done in the next week or two.

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post #83 of 88 Old 08-14-2019, 04:02 AM
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Bit more progress but going slowly! Should have them done in the next week or two.

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I have one of these drivers that I need to build an enclosure for and your bracing is giving me second thoughts about using window bracing.

Good job, it looks incredibly solid!
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post #84 of 88 Old 08-14-2019, 04:09 AM - Thread Starter
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I have one of these drivers that I need to build an enclosure for and your bracing is giving me second thoughts about using window bracing.



Good job, it looks incredibly solid!
Thanks mate, the box is an absolute tank, but also weighs the same as a tank, 2x4s might have been a better option with regards to weight but at least I know its braced well! Each box used about 3 sheets of mdf so I'm assuming the weigh more than 100kg (220lbs) without the drivers, and I have to get them up a small English staircase yet!

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post #85 of 88 Old 08-14-2019, 04:20 AM
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Thanks mate, the box is an absolute tank, but also weighs the same as a tank, 2x4s might have been a better option with regards to weight but at least I know its braced well! Each box used about 3 sheets of mdf so I'm assuming the weigh more than 100kg (220lbs) without the drivers, and I have to get them up a small English staircase yet!

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That sounds nuts even with a jack/trolley. All the best with that, maybe get someone to help and just take it slowly, also you might wanna put some wheels on it for general movement.
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post #86 of 88 Old 08-14-2019, 05:54 PM
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Monty,

The new sub is looking great! Hey, here's an item you may want to consider picking up, when the time comes to move your subs into your theater.....

These straps make moving large heavy subs ridiculously easy. If you have a friend that can help you, moving that 250lb + subwoofer, will feel like it weighs about one tenth of that weight.

When a friend recently came over to my place to help me move around a few Devastator cabs I built, we were laughing out loud the first time we picked one of them up with these straps, due to how light they made the cabinets feel.

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post #87 of 88 Old 08-15-2019, 06:50 AM - Thread Starter
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Monty,



The new sub is looking great! Hey, here's an item you may want to consider picking up, when the time comes to move your subs into your theater.....



These straps make moving large heavy subs ridiculously easy. If you have a friend that can help you, moving that 250lb + subwoofer, will feel like it weighs about one tenth of that weight.



When a friend recently came over to my place to help me move around a few Devastator cabs I built, we were laughing out loud the first time we picked one of them up with these straps, due to how light they made the cabinets feel.



I'll probably have to give these a go, they are ridiculously heavy!

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post #88 of 88 Old 08-15-2019, 06:51 AM - Thread Starter
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Enough clamps?

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