Gee Emm Posted July 6, 2017 Share Posted July 6, 2017 I'm building a pair of speakers for a SNA member. A Robert Brines design, M18-T772. 72 litre ported marine ply enclosure. Tall & slim. Tang Band 8" full range driver. Nice unit! 17 Link to comment Share on other sites More sharing options...
Joe Lighty Posted July 6, 2017 Share Posted July 6, 2017 Looking forward to seeing this as it progresses! Thanks for sharing this build! Link to comment Share on other sites More sharing options...
Gee Emm Posted July 10, 2017 Author Share Posted July 10, 2017 Some progress shots. Using print out of template for oval baffle. Rebate driverBandsaw comes in handy [emoji3]So does sander thingoAnd router table 7 Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2017 Share Posted July 11, 2017 Nice work G! I'm extra jealous of your workshop..... Link to comment Share on other sites More sharing options...
Gee Emm Posted July 11, 2017 Author Share Posted July 11, 2017 Thanks@GrizzlyJust build one and fill it full of tools. That's what I did! Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Guest Posted July 17, 2017 Share Posted July 17, 2017 Any more progress to show ? Listening to them yet ? Link to comment Share on other sites More sharing options...
crisis Posted July 17, 2017 Share Posted July 17, 2017 What are your reasons for using marine ply over MDF? Link to comment Share on other sites More sharing options...
Gee Emm Posted July 17, 2017 Author Share Posted July 17, 2017 Any more progress to show ? Listening to them yet ? Here ya go...Internal hardwood offset bracesPrescribed oval baffles for baffle step correction. Ovals are now stained a contrasting colour to the baffles. Final glue up. Ovals are dry doweled, and hand in place by woofer affixed through oval and front baffle. Stain, clear, sand, clear, repeat... 5 Link to comment Share on other sites More sharing options...
Gee Emm Posted July 17, 2017 Author Share Posted July 17, 2017 What are your reasons for using marine ply over MDF? The only time I would use MDF is if it is pre-veneered, or it is going to be veneered. The designer of these boxes prescribes either MDF or marine ply. I do not like working with MDF. It's heavy, it's dust is toxic, it splits, it's a @$&/($&*^% to paint. It cuts and routs well. 2 Link to comment Share on other sites More sharing options...
john.reekie Posted July 17, 2017 Share Posted July 17, 2017 Looking good Mr G. An oval is the most important thing to have. J Link to comment Share on other sites More sharing options...
crisis Posted July 17, 2017 Share Posted July 17, 2017 1 hour ago, Gee Emm said: The only time I would use MDF is if it is pre-veneered, or it is going to be veneered. The designer of these boxes prescribes either MDF or marine ply. I do not like working with MDF. It's heavy, it's dust is toxic, it splits, it's a @$&/($&*^% to paint. It cuts and routs well. I appreciate what you are saying. I think the "heaviness" of MDF is one of the reasons it is preferred for HiFi speakers. My understanding of MDF in the manufacture of HiFi speaker cabinets is that it as more acoustically dead than ply. I have used marine ply in PA and guitar cabs because alternately the intention there, at least in guitar cabs, is that the cab "adds" to the overall sound. Of course plenty of internal bracing should do the trick anyway. Link to comment Share on other sites More sharing options...
Gee Emm Posted July 17, 2017 Author Share Posted July 17, 2017 All things being equal, I don't think MDF "sounds better" than marine ply. 1 Link to comment Share on other sites More sharing options...
Rob181 Posted July 17, 2017 Share Posted July 17, 2017 Certainly not under water... 3 Link to comment Share on other sites More sharing options...
Guest Posted July 17, 2017 Share Posted July 17, 2017 12 hours ago, Gee Emm said: All things being equal, I don't think MDF "sounds better" than marine ply. , an interesting point Have listened to well braced marine ply ring enclosures ring like a bell from a system recently that surprised the heck out of me to be honest required further treatment internally. Really well built enclosures, masterpieces. Laminating layers of both the substrates seems to be the answer even though it's a pita to do. Nice work there GeeM, more than hot wind Link to comment Share on other sites More sharing options...
crisis Posted July 18, 2017 Share Posted July 18, 2017 12 hours ago, 125dBmonster said: , an interesting point Have listened to well braced marine ply ring enclosures ring like a bell from a system recently that surprised the heck out of me to be honest required further treatment internally. Really well built enclosures, masterpieces. Laminating layers of both the substrates seems to be the answer even though it's a pita to do. Nice work there GeeM, more than hot wind Yeah that is the theory I was aware of. Marine ply resonates and "adds" to the sound. Of course ideally cabinets should be as inert a spossible. Link to comment Share on other sites More sharing options...
Gee Emm Posted July 18, 2017 Author Share Posted July 18, 2017 There are 15 ply & hardwood pieces for each of these boxes, plus internal treatment. Also consider these are vented boxes with high efficiency (low energy) drivers. I doubt they will be ringing anyone anytime soon based on there total design. 1 Link to comment Share on other sites More sharing options...
Guest Posted July 18, 2017 Share Posted July 18, 2017 Yes, no long throw 18" drivers in small sealed enclosures with a Kw behind them Link to comment Share on other sites More sharing options...
Gee Emm Posted July 18, 2017 Author Share Posted July 18, 2017 Oh, how I miss my pair of 18" subs Link to comment Share on other sites More sharing options...
Guest Posted July 18, 2017 Share Posted July 18, 2017 43 minutes ago, Gee Emm said: Oh, how I miss my pair of 18" subs get another pair gone soft or something Link to comment Share on other sites More sharing options...
Gee Emm Posted July 18, 2017 Author Share Posted July 18, 2017 Different life now. It's warm and sunny outside [emoji1303]all the time. Anyhoo. Getting to the end of this project. One more clear coat to go. 2 Link to comment Share on other sites More sharing options...
Sub Sonic Posted July 19, 2017 Share Posted July 19, 2017 22 hours ago, 125dBmonster said: Yes, no long throw 18" drivers in small sealed enclosures with a Kw behind them Who would do a thing like that? Link to comment Share on other sites More sharing options...
Guest Posted July 19, 2017 Share Posted July 19, 2017 4 minutes ago, Sub Sonic said: Who would do a thing like that? Me ? Nah, never Link to comment Share on other sites More sharing options...
Gee Emm Posted July 21, 2017 Author Share Posted July 21, 2017 27kg each 6 Link to comment Share on other sites More sharing options...
Guest BobbyD Posted July 21, 2017 Share Posted July 21, 2017 On 19/07/2017 at 7:46 AM, Gee Emm said: Different life now. It's warm and sunny outside all the time. Anyhoo. Getting to the end of this project. One more clear coat to go. Very nice job on the cabinets @Gee Emm. Curious why the inductor and cap when it's a Tang Band full range driver? Link to comment Share on other sites More sharing options...
Gee Emm Posted July 22, 2017 Author Share Posted July 22, 2017 @SETsergioSo was I!!!I built it as per the design. There is a notch filter in the crossover, I presume for baffle step. Which seems to work OK. There is also a cap & resistor across the driver, presumably to manage impedance curve???Not sure. Hard to find out. When I delivered them to the client, the cap & resistor across the driver was disconnected, as it rolled off the top end, as I thought it may. Sounds OK now [emoji1303][emoji445][emoji57] Link to comment Share on other sites More sharing options...
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