joessportster Posted March 7, 2011 Share Posted March 7, 2011 I've decided what my project will stack up like now I need to know the best material to use. I will be building 2 boxes first will be 36" wide 20" tall and 24" deep ported and will house 1 jbl2245h 18" driver this will handle everything below 60hz...................2nd cabinet will be 36" wide 24" deep and 20" tall it will house 2 altec 421-8lf drivers ported as well and will handle everything from 320 hz down.......................the 1003b with altec 291-16c will set on top of the other 2 cabinets. I like the idea of 2 cabinets stacked as they will be tons easier to move. So what's best to use for the cabinets. I like Baltic birch but don't know if I can get it. Joe Quote Link to comment Share on other sites More sharing options...
Ironsave Posted March 7, 2011 Share Posted March 7, 2011 I've decided what my project will stack up like now I need to know the best material to use. I will be building 2 boxes first will be 36" wide 20" tall and 24" deep ported and will house 1 jbl2245h 18" driver this will handle everything below 60hz...................2nd cabinet will be 36" wide 24" deep and 20" tall it will house 2 altec 421-8lf drivers ported as well and will handle everything from 320 hz down.......................the 1003b with altec 291-16c will set on top of the other 2 cabinets. I like the idea of 2 cabinets stacked as they will be tons easier to move. So what's best to use for the cabinets. I like Baltic birch but don't know if I can get it. Joe Joe, I do not have the answer to your question; but I am not such an *** as to try and insult you for your plans..... Not sure where to score good straight plywood; but hopefully some REAL MEMBERS will chime in...... S Snyder.... you should go back to school and learn some manners. (Grow up dude). [bs] ( Reminds me of DJ NICK) Quote Link to comment Share on other sites More sharing options...
joessportster Posted March 7, 2011 Author Share Posted March 7, 2011 Ironsave. The troll ssnyder isn't worth the time. He's obviously just an instigator (not a very good one at that) I'm sure his days are numbered here. It won't take Amy long to catch up with him. I've got a line on Baltic birch, waiting on a quote. Joe Quote Link to comment Share on other sites More sharing options...
djk Posted March 8, 2011 Share Posted March 8, 2011 Driver Properties Name: 421-8LF Type: Standard one-way driver Company: Altec Lansing No. of Drivers = 2 Mounting = Standard Wiring = Parallel Fs = 27.5 Hz Qms = 2.75 Vas = 576 liters Cms = 0.595 mm/N Mms = 56.32 g Rms = 3.539 kg/s Xmax = 1.27 mm Xmech = 1.905 mm P-Dia = 12.77 in Sd = 825.8 sq.cm P-Vd = 0.105 liters Qes = 0.28 Re = 5.5 ohms Z = 8 ohms BL = 13.83 Tm Qts = 0.25 no = 4.1 % 1-W SPL = 98.3 dB 2.83-V SPL = 99.9 dB ----------------------------------------- Box Properties Name: Type: Vented Box Shape: Prism, square (optimum) Vb = 8.188 cu.ft Fb = 39.73 Hz QL = 5.436 F3 = 58.29 Hz Fill = minimal No. of Vents = 4 Vent shape = round Vent ends = one flush Dv = 4 in Lv = 5.245 in ------------------------------------------------------------------------------------------------------------------ Name: 421-8LF Type: Standard one-way driver Company: Altec Lansing No. of Drivers = 2 Mounting = Standard Wiring = Parallel Fs = 27.5 Hz Qms = 2.75 Vas = 576 liters Cms = 0.595 mm/N Mms = 56.32 g Rms = 3.539 kg/s Xmax = 1.27 mm Xmech = 1.905 mm P-Dia = 12.77 in Sd = 825.8 sq.cm P-Vd = 0.105 liters Qes = 0.28 Re = 5.5 ohms Z = 8 ohms BL = 13.83 Tm Qts = 0.25 no = 4.1 % 1-W SPL = 98.3 dB 2.83-V SPL = 99.9 dB ----------------------------------------- Box Properties Name: Type: Closed Box Shape: Prism, square (optimum) Vb = 4.797 cu.ft Qtc = 0.707 QL = 13.82 F3 = 82.07 Hz Fill = minimal Quote Link to comment Share on other sites More sharing options...
joessportster Posted March 8, 2011 Author Share Posted March 8, 2011 DUI. Thancs for the information. Is this info available thru a web site or is it a program you have. Joe Quote Link to comment Share on other sites More sharing options...
Pete H Posted March 8, 2011 Share Posted March 8, 2011 Hi Joe, BB plywood is the only way to go IMHO. I typically buy it in 5'x5' sheets 19mm (3/4") and it runs around 45 per sheet. It is wonderful for building cabinets and once you work with it you won't go back to anything else. Quote Link to comment Share on other sites More sharing options...
JJkizak Posted March 8, 2011 Share Posted March 8, 2011 If you want the best quality plywood it will run you about $400.00 per 3/4" thick 4 x 8 sheet. JJK Quote Link to comment Share on other sites More sharing options...
garyeanderson Posted March 8, 2011 Share Posted March 8, 2011 Hi Joe I do my shopping on craigslist, you need to wait to find stuff but good deals can be had. I looked at http://www.boulterplywood.com/products_hardwoodplywood_4.htm to find out some basic information Lots of good info on what a good supplier will have. They list there current prices on what they offer and also carry 1 inch 1 1/8 and 1 1/4 MDF in 4 x 8 and some 4 x 10 (1 1/4 inch). Many of the better suppliers will have 1 inch hardwood plywood in limited species of faces, I think that most of the cores are poplar, or at least that is what Boulter Plywood caries. I ended up laminated two sheets of Baltic birch to get what I wanted as I found 12 and 15 mm sheets in 5 x 5 for $15 a sheet. I got 15 sheets for $225 last summer, I should have bought the rest of the 15mm but didn’t have the money or place to store it correctly (laying flat on a flat floor). It’s not the way I wanted to do it but the money was in line with what I wanted to pay. It was a lot of work to make decent panels and my press was all of the scrap metal I had around the house, I probably had 700 to 800 pounds to use and I ended up loosing some material on the perimeter of some sheets doing it this way. I am building Cornwall clones at the moment with more craigslist 3/4 S.A. Mahogany for the sides and fronts and left over laminated double 12mm Baltic birch for the backs and internal bracing. I weighed the cut plywood the other day and it came out to 77 pound for just the wood parts. Quote Link to comment Share on other sites More sharing options...
joessportster Posted March 8, 2011 Author Share Posted March 8, 2011 Thanks for the responses I do appreciate it. I'm leaning twords Baltic birch but finding it local is turning out to be a challange. Best I've found so far is 75.00 a sheet for 5x5. I never even considered craigslist thanks for that. Joe Quote Link to comment Share on other sites More sharing options...
juniper8 Posted March 8, 2011 Share Posted March 8, 2011 You might be able to find 3/4 inch marine grade plywood in 4/8 sheets some dealers will even epoxy sheets together if you need thicker. From what I have read many of the more expensive altec type speakers for sale use 1.5 inch walls. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted March 8, 2011 Share Posted March 8, 2011 Joe, There are a lot of post on the forum about subwoofer construction and because of the relative size (area vs thickness) of you cabs, some insight as to how these folks did internal bracing might be insightful. For large cabs, I personally like panels that slide into mitered grooves which have large circle cut outs in them. The same approach used to make wooden I-Beams. for large cuts I use a panel saw. Also have one of these. 30 bucks at home depot. it lets you make straight cuts with out having to move large sheets of ply across a table saw. its called a Accu-Rip Accu-Rip Circular Saw Guide Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted March 8, 2011 Moderators Share Posted March 8, 2011 If you have problems finding other wood, you could always try the Hardwood plywood they sell at Home Depot. I have used it before and at $50 a sheet for 3/4" it's really good for the price considering the trashy BC plywood is over $30 a sheet now. I have gone through almost 20 sheets on projects over the last few years and had no problems with it, also it really rare to find a void . If not try to find somewhere local that specializes in fine wood, there is a place here but that does not do you any good where your at. I would love to try some of these flavors they sell here, l had called a while back and was surprised at the prices, most were between $40 and $75 per sheet. http://www.riversidelumber.com/frameset.htm Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted March 8, 2011 Moderators Share Posted March 8, 2011 Found a pic of the HD stuff for $50. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted March 8, 2011 Share Posted March 8, 2011 ditto HD ply Quote Link to comment Share on other sites More sharing options...
djk Posted March 8, 2011 Share Posted March 8, 2011 " Is this info available thru a web site or is it a program you have" I use BassBox Pro v6.0 (from Parts Express). I just asked for the flattest solution in both sealed and vented. Quote Link to comment Share on other sites More sharing options...
joessportster Posted March 9, 2011 Author Share Posted March 9, 2011 Thanks for all the help guys. I do appreciate it. I like the I beam brace idea fritz. I used those alot when I was doing framing carpentry. Joe Quote Link to comment Share on other sites More sharing options...
jcmusic Posted March 9, 2011 Share Posted March 9, 2011 Joe, I just finished closing in the backs of my khorns with the stuff from HD, no worries it worked great. Jay Quote Link to comment Share on other sites More sharing options...
Pete H Posted March 9, 2011 Share Posted March 9, 2011 Joe, I would shop around on the BB. 75 per sheet is off the chart as far as price goes. I just hung up with my supplier to make sure the market didn't take a big shift and was quoted 44 per sheet. Quote Link to comment Share on other sites More sharing options...
tromprof Posted March 9, 2011 Share Posted March 9, 2011 Joe, I would shop around on the BB. 75 per sheet is off the chart as far as price goes. I just hung up with my supplier to make sure the market didn't take a big shift and was quoted 44 per sheet. I can find 3/4 inch BB in Cincinnati for $58.00 on a 4x8 sheet, and $35.00 for 5x5 (Rockler, and its really nice stuff). Paying $75.00 a sheet is way too much! Quote Link to comment Share on other sites More sharing options...
moray james Posted March 9, 2011 Share Posted March 9, 2011 Plywood which is void free made from selects and better veneer will not have any buzzez or rattles. Panels made up from equal thickness laminates of ply and MDF will give excellent results. The plywood provides the stiffness while the MDF damps the ply panel. Cost is lower than straight ply construction and the panel is damped and acoustically dead. Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.