My 85L Vented Shiva Project Questions

Gerry S · 12-09-2003, 11:13 PM

I am making good progress on building my subwoofer, and had a question concerning mounting the plate amp.

I'd like to mount the amp in the cabinet, but don't want to do this if it will have a negative effect on the performance of the sub. The plans themselves make no mention (good or bad) of mounting the amp, so I thought I would see if anyone could give me the thumbs up or down concerning mounting the amp in the cabinet. If I do mount the amp it looks like it must go in the front panel(front according to the plans).

Thanks.

Brian Bunge · 12-10-2003, 12:05 AM

Gerry,

I've mounted the amp to the back of similar subs many times. I usually just cut out a small "notch" in the brace to allow for clearance for the amp.

Gerry S · 12-10-2003, 08:09 AM

What do you think of mounting it to the "front" where there is no brace? Is there really a "front" to a subwoofer in terms of placement of the sub?

Brian Bunge · 12-10-2003, 08:58 AM

Gerry,

It really doesn't matter. You can mount it on any of the vertical surfaces. You may even be able to offset to one side so that it doesn't interfere with any of the bracing.

Gerry S · 12-10-2003, 10:07 PM

One more questions concerning mounting the driver. Should I use some T-Nuts or just go with the coarse drywall screws?

thanks,
Gerry

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Brian Bunge · 12-10-2003, 10:21 PM

I don't like T-nuts since they have a tendancy to break loose from the MDF. So the coarse thread drywall screws would be a better choice, IMHO.

Gerry S · 12-14-2003, 10:26 AM

I am starting to think about the veneering part of the project. I'd like to round over the vertical corners of the cabinet. The router bit I have is a Crapsman bead/corner bit, and I cant seem to get it to work without a bead. The larger bearing (the one I think I need to use) doesnt have a slinger washer so I cant get it centered.

Anyways I am thinking about buying a new roundover bit. Since I am finishing with 10 mil paperback, are there any suggestions for which size roundover bit to use?

Thanks.

Dean-P · 12-14-2003, 10:45 AM

3/4" roundover...

Michael Hartwig · 12-14-2003, 06:33 PM

For my Tempest Octagon sub I made a seperate cabinet for the sub amp to sit in and have it positioned with my other audio gear. You only need speaker wire going to the sub cabinet. As for mounting the sub I always use T-nuts. This gives you the most secure mount. The key to sucessful use is to make sure you install them correctly (drill press facilitates in a true perpendicular mounting hole (miss aligned holes is probably the most common cause for failure); the hole has to be large enough to accept the sleeve; hammer the t-nut in (have a solid surface to hammer on), don't try to suck it in with a bolt.) I use T-nuts frequently in my furniture building projects and have had no problems.

Larry Alan · 12-14-2003, 06:46 PM

Brian,
I don't understand why the Tee nuts come loose. If they were mounted on the inside with prongs facing toward the outside, they can't come loose. Do you mean they break the mdf because they are so close to the edge? I was planning on using tee nuts, so your input is greatly appreciated.
Larry Alan

Brian Bunge · 12-15-2003, 10:04 AM

Larry,

Yes, the T-nut can tear through the MDF; even if it isn't near the edge. I had this happen to me when installing some of the T-nuts for the black chrome spikes that PE sells. I think threaded inserts are a much better solution.

Gerry,

A 1/2"-3/4" roundover will work fine for 10 mil paperbacked veneer.

Gerry S · 12-16-2003, 09:14 PM

The plans call for 3.5" long legs. I did that and then rounded over the corners. Problem is I rounded over the top lip on a couple of legs. So if I trim off 1/8" to clean up my blemish I'll end up with legs that are 3 3/8" long. Problem?

I could always just throw some wood putty on the edge and then round it over again as well. What do you guys think?

I probably sound real anal! I just want this to turn out as clean as possible. Plus I also want a good solid surface to attach the veneer to.

In hindsite, I think if I use a fence on my router table I wont have this problem. Live and learn.