My (in progress) project *pics too*

[captainobvious99]

Re: My (in progress) project *pics too*

1-2ohm load...a bit? It would cause most a global meltdown. :D

I agree it's probably his traces.

Hmm, the traces dont show an impedance that low in the ranges used so Im not exactly sure why it would come out like that. Does PCD ignore the summed impedance curve when using active filters?
Either way, it shouldnt be a big issue. I have seperate amplification channels for L/M/H for each channel and active crossovers. The amps are being built with 4 ohm impedances in consideration. Any concerns you notice ?

[captainobvious99]

Re: My (in progress) project *pics too*

Just a suggestion on the sims - fix your FRD files. I doubt the woofers have that nice, ultra flat high end response, for example. You can add an approximation of the natural roll-off using Bagby's "Response Modeler".

Also as noted, your impedance will make most amps sweat a bit.

Will this effect the accuracy of the simulation if the response trace stops at 2K and the woofers LPF cutoff frequecy is 250hz LR4?
Thanks for the feedback Johnny, appreciated

[johnnyrichards]

Re: My (in progress) project *pics too*

Will this effect the accuracy of the simulation if the response trace stops at 2K and the woofers LPF cutoff frequecy is 250hz LR4?
Thanks for the feedback Johnny, appreciated

Maybe - it will affect phase for sure. However, as I noted above I have no idea about phase within an active system.

[captainobvious99]

Re: My (in progress) project *pics too*

I have a newfound respect for how quickly some of you complete your builds... :eek:


Progress is slow, but it's moving along. Cut a few more pieces and glued together the pieces for the top wedge front baffles. Still have to do the bass bin baffles, rear wedge, bracing, bondo any gaps and then sand smooth.

The pieces you see inside the bass bin are the sides for the rear wedge.

[pypes]

Re: My (in progress) project *pics too*

Nice progress! All the angles would be giving me a headache.

[captainobvious99]

Re: My (in progress) project *pics too*

Nice progress! All the angles would be giving me a headache.

You wouldn't be alone. They are giving me headaches too. ;)

My next issue is going to be cutting the 45 degree edges on the baffle corners. I have a good sized 45 degree bit for the router, but its not big enough to go through 1.5" thick material. I'm going to have to test it out and see what it looks like using the router and then decide if I need to take it to the table saw (which is a POS and will also give me headaches).

Cant wait until these enclosures are finished and I can start playing with drivers. :(

[captainobvious99]

Re: My (in progress) project *pics too*

Fellas-

Please take a look at the above pics of the enclosures. I want to know your opinions on internal bracing for these cabinets. Would 1" dowels cut and glued into place be sufficient? I'm think around (3) left to right, (3) front to back and one, maybe 2 from top to bottom. Or I could just use a few square rods around the top and bottom internal joints. The top wedge will probably only require the two horizontal braces.


I also have plenty of 2x4 pieces and tons of MDF scrap, but I figure dowels will use less volume in the enclosure, and create less aggressive internal reflections (if that makes a difference...?).


Thoughts?

[johnastockman]

Re: My (in progress) project *pics too*

Fellas-

Please take a look at the above pics of the enclosures. I want to know your opinions on internal bracing for these cabinets. Would 1" dowels cut and glued into place be sufficient? I'm think around (3) left to right, (3) front to back and one, maybe 2 from top to bottom. Or I could just use a few square rods around the top and bottom internal joints. The top wedge will probably only require the two horizontal braces.


I also have plenty of 2x4 pieces and tons of MDF scrap, but I figure dowels will use less volume in the enclosure, and create less aggressive internal reflections (if that makes a difference...?).


Thoughts?

The dowels placed like you mentioned would work well...and take up less volume. I've used 2"x 4" pieces before, 1" x 4", and sandwiched some 3/4" MDF pieces together for 1.5" thick, about 3-4" wide. That's going to be a nice project.

John A.

[captainobvious99]

Re: My (in progress) project *pics too*

Thanks for the response John. I think the dowels may be the way to go then, combined with some 2x2's around the edge where the baffle will meet the box, flush trimmed for best adhesion of the baffle to enclosure.

Looks like I'll be making some more saw dust over the holiday here. I'd really love to make a push and get the enclosures together and ready for driver mounting and testing (no finish yet of course, that would come later).

[captainobvious99]

Re: My (in progress) project *pics too*

Started with the dowels and bracing...

[pypes]

Re: My (in progress) project *pics too*

Any reason you put those three so far towards the back?

[captainobvious99]

Re: My (in progress) project *pics too*

Any reason you put those three so far towards the back?

Because I dont want them to interfere with the drivers mounting depths ;)
They probably could have come forward just a bit more but I think they'll do the job well. They are a few inches away from the back wall despite looking rather close.

They are pretty stiff as they are right now. That said, I will end up adding a 2x4 (or 1.5 x 3.5 the way they make 'em these days...) as a brace across the front middle area just outside of the area for the drivers. These cabinets are getting heavy

In addition to the glue, I like to coat each internal seam of my boxes with a clear silicone bonding/sealing caulk. Just another added bit to ensure they are airtight and well sealed. Im gluing up/laminating the front baffles for the bass cabinets today and hope to get the 45 degree cuts made for both front baffles this holiday break. I'm going to make a test cut with the 45 degree chamfer bit I have but I doubt its going to have the cutting depth to get the look I want. Might have to use my buddies table saw again...

[captainobvious99]

Re: My (in progress) project *pics too*

Just a quick update. My Katana flush trim bit arrived so I flushed up the cabinets and then sanded smooth. Next step is to mount the baffles, cut driver recesses and cutouts and then cut the 45 degree angles. Followed by the top wedge cabinet...

(Yes they are upside down in the pics)

[captainobvious99]

Re: My (in progress) project *pics too*

Been a while since I've had a chance to work on these...holidays and all..
Not to mention the very cold weather out here in PA :(

Anyway just a small update. I checked out the page with a guide for cutting out driver recesses for truncated frames and got the template made and tested for the Tang Band W4 drivers. This project is the first time I've used my new router (or any router for that matter!) and Im pretty impressed with the Hitachi. Not the quietest thing, but not terribly noisy either. Plenty of power for cuts and easy to use with all of the different attachments and depth guides. I ordered a set of the brass guides from MLCS and then realized that this router came packaged with a set of its own- doh! If someone needs a set, PM me.

On another note, I just picked up my prepro for use with the home system. Its a Sunfire Theater Grand. Got some time to test it out with my friends Martin Logans last night and it sounds quite good. Balanced XLR outs for the DCX2496 are a nice bonus and should keep things nice and quiet.

A quick pic for you of the template is below. I expect to get cracking on the cutouts and angle cuts on the front baffles this weekend. Now that I have all this great gear sitting here I need to get off my bum and get to work ! :D



And a few more pics I didnt upload yet. The closeup one I took after using the flush trim bit. Nice!

[pypes]

Re: My (in progress) project *pics too*

Nice work. Your template looks handy :D