Search found 316 matches

by Rick Lee
Sun Oct 06, 2019 10:10 pm
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: 1/8 ply board shortage... sad but true
Replies: 7
Views: 648

Re: 1/8 ply board shortage... sad but true

These work very well. Easier than sheet material. Durable. It's all I ever use for DR's
https://www.homedepot.com/p/SAKRETE-12- ... /100324386
by Rick Lee
Sat Apr 06, 2019 3:15 pm
Forum: Build Threads
Topic: 2xDR250 CNC project
Replies: 11
Views: 983

Re: 2xDR250 CNC project

Looks great! Buying/building a CNC machine is one of my future goals especially since I'm sure there are no maker spaces anywhere close. Concerning the thinner ply, I've built DR200s out of 1/4" and it worked well. I increased bracing as well but would say that extra bracing on the outer side panels...
by Rick Lee
Tue Mar 05, 2019 12:45 am
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

If the sub(s) modeled well in the back of the room you could build a raised platform with the subs built into them. Otherwise..., eh. Sounds like you're not really understanding absorbing sound and isolation. I only understand it coming at it as a musician and not from an engineering angle so I'm ce...
by Rick Lee
Sun Mar 03, 2019 12:39 am
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

Well, you have it easy then. Don't worry about sound leakage but I would still drywall all of it (with caulking and fiberglass on the backside) because the low resonance of each complete unit will help dissipate peaks and smooth out the low end. However, I wouldn't use the same thickness of drywall ...
by Rick Lee
Sat Mar 02, 2019 3:45 pm
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

Ooo, more comments and pictures!! Yes, seal the hole with concrete and flexible caulk. That's a huge weak area sound wise. Looks like the pipe doesn't penetrate the inner wall. Yay! I've got lots of thoughts on your door but it looks like you're headed in the right direction. The main thing with the...
by Rick Lee
Sat Mar 02, 2019 3:24 pm
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

Ah, I remember your build threads. Love how you did the Table Tubas. Time flies.... Okay, the picture is coming into focus: you built the stud walls and ceiling not necessarily for isolation, just as space to run electrical and acoustic insulation. The penetrations are the door and an 8" hole. I'm a...
by Rick Lee
Thu Feb 28, 2019 11:22 am
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

Correct. Just trying to keep things simple for the OP. He currently has a single leaf structure that has a lot of mass. Because of the mass only the lowest frequencies will have enough energy to cause the floor, walls and ceilings to resonate and thus radiate sound to the other side. The simplest wa...
by Rick Lee
Thu Feb 28, 2019 12:17 am
Forum: Build Threads
Topic: Under Garage Home Theater Build
Replies: 48
Views: 4341

Re: Under Garage Home Theater Build

Are you building a room within a room? Without looking too carefully that's what it looks like. With all the concrete it's a little bit of overkill but if that's really what you're going for I'm curious what you're doing with the door and HVAC system. It's a whole nother world if you're trying to mi...
by Rick Lee
Fri Aug 10, 2018 8:12 pm
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: Compression horn tips, tricks (UPDATE)
Replies: 61
Views: 5385

Re: Compression horn tips, tricks

Which means a total redraw of the plans... Actually, it's not that hard. All the dimensions except one (the length of the inner horn) extrapolate easily and can be done while you're drawing out the cab. The horn length only changes 1/4" which is negligible. Figuring the bracing takes a little more ...
by Rick Lee
Mon Aug 06, 2018 11:19 am
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: Compression horn tips, tricks (UPDATE)
Replies: 61
Views: 5385

Re: Compression horn tips, tricks

I suppose it would be roughly half the weight of the standard 1/2" constructed cab, plus a little for the extra bracing. Did you hear or measure any downside in sound quality? Would you consider the sound essentially the same? Sorry for the late reply but hope this is still timely. What Bill said i...
by Rick Lee
Fri Jul 27, 2018 3:13 pm
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: Compression horn tips, tricks (UPDATE)
Replies: 61
Views: 5385

Re: Compression horn tips, tricks

This is where the ADHD musician, not an engineer side of me comes out.... I do remember weighing a DR200 but the number I wrote down has long disappeared. It's a very noticeable difference if the whole cab is 1/4". Not a big difference if the outside panels are 1/2".
by Rick Lee
Thu Jul 26, 2018 12:14 pm
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: Compression horn tips, tricks (UPDATE)
Replies: 61
Views: 5385

Re: Compression horn tips, tricks

Rob, I had a tight schedule for about the last two years so haven't been on here much, so I only last night got to see some of your work on the Jack Lite. Very nice! I signed up for the CAD club for the Chipper https://www.chipper.aero and they sent me a little sample of aluminum honeycomb. Feels al...
by Rick Lee
Thu Jul 26, 2018 12:45 am
Forum: DR Horn Loaded Bass/Keyboard/PA Speakers
Topic: Compression horn tips, tricks (UPDATE)
Replies: 61
Views: 5385

Re: Compression horn tips, tricks

No pin nailer on the horns. Hot melt on each end of a piece with PL in the middle. I always build them with 1/4" BB no matter which DR it is. Gotta make sure to compensate the measurements. When doing sweeps to test the box you can hear the horn resonate a little bit with 1/4". It's not a big deal b...
by Rick Lee
Sat Jun 23, 2018 2:30 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: THT sub: sizes.
Replies: 41
Views: 4315

Re: THT sub: sizes.

The DR and Otops are better spec'd. By that I mean that the passbands for the drivers are more optimized; 2 way instead of 3 way. The low/mid goes higher before the xover point which gives more dynamic range/less distortion, etc. to the high horn and the high horn is small enough (roll off on top en...
by Rick Lee
Fri Jun 15, 2018 1:26 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: THT sub: sizes.
Replies: 41
Views: 4315

Re: THT sub: sizes.

Sorry I don't get on here much, but for some reason this thread popped up in my email notifications. Hopefully you can still use my opinion. So, I read through the whole thing and I can tell you your best answer from personal experience. Again, I've built Othorns (finishing two right now) and am act...