niceguyhomer Posted September 28, 2009 Share Posted September 28, 2009 If anyone wants to sell their Gramma Pad - please let me know. Quote Link to comment Share on other sites More sharing options...
dave_bass5 Posted September 28, 2009 Share Posted September 28, 2009 [quote name='lemmywinks' post='608772' date='Sep 25 2009, 04:50 PM']Yeah i tried my Schroeder on a stand and the bottom end went walkies, on the Gramma it's right there and nice and tight. Maybe it's the magic pixie dust in the Auralex foam? So that's where my £50 went! Btw i got all the p1ss taking when i started using it, especially when i foolishly told our singer how much it cost. You sound like a total clown trying to justify spending money on wood and foam[/quote] Same here. I hate having to elevate my cab for the same reason. I was a bit weary about using the foam but it does seem to keep most of the low end. Maybe its different if i used the platform as well. Quite fancy getting one now. Quote Link to comment Share on other sites More sharing options...
niceguyhomer Posted October 7, 2009 Share Posted October 7, 2009 Largo - did you build yours? I'm thinking of having a go myself this weekend. Quote Link to comment Share on other sites More sharing options...
dave_bass5 Posted October 7, 2009 Share Posted October 7, 2009 Ive decided to buy one at some point soon. Over the past couple of weeks ive used my foam at all the gigs and i do like what i hear. I find my DJ5 is a bit deeper sounding than my P5 and its been getting a bit out of control on the hollow stages/wooden floors. The foam has really helped but i feel a proper platform will be even better. Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted October 7, 2009 Share Posted October 7, 2009 [quote name='lemmywinks' post='606872' date='Sep 23 2009, 05:41 PM']Pics up as promised, if you need any more from different angles give us a shout Like i said, a bit cheeky for £50![/quote] What is the purple foam in the middle "supposed" to to? Quote Link to comment Share on other sites More sharing options...
Kirky Posted October 7, 2009 Share Posted October 7, 2009 I'd be interested in building one too. Any idea where I can get the foam strips from? Quote Link to comment Share on other sites More sharing options...
dave_bass5 Posted October 7, 2009 Share Posted October 7, 2009 [quote name='Kirky' post='619523' date='Oct 7 2009, 01:06 PM']I'd be interested in building one too. Any idea where I can get the foam strips from?[/quote] I got mine from Studio Spares. Quote Link to comment Share on other sites More sharing options...
Legion Posted October 7, 2009 Share Posted October 7, 2009 This thread inspired me to buy a Gramma (absolute music had an ex display one - took me 5 mins to actually find what was wrong with it). I'm intrigued how its going to sound but I've got a lot of rehearsals and 3 very different gigs in the next few weeks so I'll give it a go. If nothing else I'm hoping it will enable me to dial in a fairly consistent sound on varying stages/floors and clean up a little bit of boominess. J Quote Link to comment Share on other sites More sharing options...
lemmywinks Posted October 7, 2009 Share Posted October 7, 2009 [quote name='MoonBassAlpha' post='619486' date='Oct 7 2009, 12:40 PM']What is the purple foam in the middle "supposed" to to?[/quote] It makes your car go faster and also increases the size of your wang twofold. Really, i have no idea! Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted October 7, 2009 Share Posted October 7, 2009 hmm... might have to buy TWO of those then... Quote Link to comment Share on other sites More sharing options...
alexclaber Posted October 7, 2009 Share Posted October 7, 2009 [quote name='warwickhunt' post='608768' date='Sep 25 2009, 04:44 PM']I have to confess that I thought I'd be losing some bottom end but that doesn't seem to be the case, I'd love to hear the science behind why that doesn't happen.[/quote] You don't lose any true bottom because the cab is still close to the floor. As you elevate the cab further from the floor the highest frequency that benefits from boundary coupling gets lower and lower, until eventually it goes below the useful range of a bass cab - by which point the cab would need to be 7 feet from the floor boundary! The coupling the PlatFoam reduces is mechanical coupling, not boundary reinforcement aka acoustic coupling. With boundary reinforcement the floor acts as a solid and unmoving reflector, so you just get more bottom in a consistent and predictable manner. With mechanical coupling the floor acts as a wobbly resonator, like a giant drum skin - as a non-harmonic resonator it has a rather atonal series of resonant modes, which different notes will excite in different ways, hence almost random booming on some notes but nothing on others. Nightmare! Glad to see that the PlatFoam idea is catching on, I've been banging on about it for years - just ordered a load myself in fact. Alex Quote Link to comment Share on other sites More sharing options...
dave_bass5 Posted October 7, 2009 Share Posted October 7, 2009 [quote name='alexclaber' post='619773' date='Oct 7 2009, 05:16 PM']Glad to see that the PlatFoam idea is catching on, I've been banging on about it for years - just ordered a load myself in fact. Alex[/quote] I think it was you who put me on to in in the wooden stage thread a while ago. Glad you did. Quote Link to comment Share on other sites More sharing options...
largo Posted October 7, 2009 Author Share Posted October 7, 2009 Haven't built mine yet, but now have everything I need so hoping to grab a bit of time this weekend. My Schroeder cab is pretty much 60cm x 40cm so going to build a platform pretty much this size. Will post some pics when I get started. Quote Link to comment Share on other sites More sharing options...
niceguyhomer Posted October 19, 2009 Share Posted October 19, 2009 Any news largo? Quote Link to comment Share on other sites More sharing options...
largo Posted October 19, 2009 Author Share Posted October 19, 2009 Mmmm, not sure if I should be speaking to you as you beat me to a P5 by (I reckon) 2 minutes..... And still a bit peaved as I was told by voxpop that he would get in touch on Saturday to let me know whether the bass was gone or not. Still waiting!!!! I'd be grateful for first dibs on the P5 if it doesn't work out for you? Back to the build, last weekend I went about building my very own Gramma-pad-a-like. I'll go through this Blue Peter style, so starting with the shopping list. Auralex Platfoam X1 from Studiospares @ £11.07 - I cancelled my web order half-way through and was emailed the next morning offering free delivery if I wanted to go ahead with the order. Wee tip!!! Carpet Speaker Covering from Maplin - 0.5m x 1.5m at £4.97 inc shipping Other stuff I had lying around. PVA Glue, Evostick Glue 15mm external plywood. Got an offcut from a joiner friend of mine. Staple Gun [b]Step One[/b] - Measure Schroeder 410L and cut plywood to size. 62cm x 45cm is a couple of cm bigger in each dimension. [b]Step Two[/b] - Measure carpet covering and cut to size, around 10cm too big round all edges. [b]Step Three[/b] - Spread PVA glue on top side of board and pulled tight. [b]Step Four[/b] - Stapled underside to hold in place. [b]Step Five[/b] - Measured Auralex Platfoam. Cut in half using a sharp meat carving knife. Don't tell the missus !!! [b]Step Six[/b] - Cut another panel of carpet cloth. Glue in place, and then use staples. Most of these will be hidden by the platfoam anyway. [b]Step Seven[/b] - Glue underside of platfoam using PVA. Also used fair amount of Evostick (not shown) as the PVA didn't seem strong enough. [b]Step Eight[/b] - Put on some extra weight and left overnight to dry. I now have what I think a Gramma pad will look like. Will be trying this out on Saturday's gig and will let you all know how it goes. My only complaint is that I forgot to take a picture of this when it was finished, and it's now chucked in the back of the trailer. I'll post a finished article picture after the weekend. Quote Link to comment Share on other sites More sharing options...
niceguyhomer Posted October 19, 2009 Share Posted October 19, 2009 Thanks for that largo - I've PMd you about the P5. Quote Link to comment Share on other sites More sharing options...
Rich Posted October 19, 2009 Share Posted October 19, 2009 That's pretty much how I did mine. The only differences are 1) I used carpet tiles which I [s]stole[/s] [s]lifted[/s] borrowed from work, 2) I cut a carry-handle slot in mine -- I highly recommend this, it makes it dead easy to carry even if you only have 1 or 2 fingers free! and 3) the layout of the foam. I used 3 bits of foam because at the time I had an SWR Triad, and I was a bit concerned that 2 bits of foam wouldn't handle all 80+lbs..! I expect it would have though. I suppose it's possible that with that centre strip added, mine will block less vibration than yours. It certainly works bloody well as it is though! Excuse the tatty black paint on the underside... the spray can ran out and after all this time I [i]still[/i] haven't got my arse into gear to buy another. So... yay for homemade Grammas! [attachment=34769:platform_1.jpg] [attachment=34770:platform_2.jpg] Quote Link to comment Share on other sites More sharing options...
Kirky Posted October 20, 2009 Share Posted October 20, 2009 I've ordered the parts and am going to have a go this weekend. Do you reckon it needs the carpet on the underside or could I just glue the platfoam direct to the wood? Quote Link to comment Share on other sites More sharing options...
biskitbass Posted October 26, 2009 Share Posted October 26, 2009 [quote name='warwickhunt' post='608768' date='Sep 25 2009, 04:44 PM']I use one (the 30"x19" one) with my pair of Aggie DB12's and aside from the isolation benefit it lifts the cabs that bit extra off the floor which does help with such diminutive cabs. The guitarist in one of my bands laughed when I first used it but wasn't laughing so much when we played on a big hollow stage and he struggled to control the bottom end on his guitar amp... I had no such problems! I have to confess that I thought I'd be losing some bottom end but that doesn't seem to be the case, I'd love to hear the science behind why that doesn't happen.[/quote] Hiya mate. Do you have any pics of that setup? Got the two aggie cabs myself and keen to se what it look slike :-) Quote Link to comment Share on other sites More sharing options...
warwickhunt Posted October 26, 2009 Share Posted October 26, 2009 [quote name='biskitbass' post='637089' date='Oct 26 2009, 05:18 PM']Hiya mate. Do you have any pics of that setup? Got the two aggie cabs myself and keen to se what it look slike :-)[/quote] I have to confess the pad is pretty unobtrusive and I've yet to have anybody at a gig (other than band members) even notice that it is there. I'll flick through some recent gig pics later but I've not 'specifically' taken a pic of it so it may well be a background jobbie. If I can't find one I'll get one taken but I don't have a gig for a couple of weeks, so as and when. Quote Link to comment Share on other sites More sharing options...
biskitbass Posted October 26, 2009 Share Posted October 26, 2009 [quote name='warwickhunt' post='637150' date='Oct 26 2009, 07:23 PM']I have to confess the pad is pretty unobtrusive and I've yet to have anybody at a gig (other than band members) even notice that it is there. I'll flick through some recent gig pics later but I've not 'specifically' taken a pic of it so it may well be a background jobbie. If I can't find one I'll get one taken but I don't have a gig for a couple of weeks, so as and when. [/quote] Thankyou :-) Quote Link to comment Share on other sites More sharing options...
Rich Posted October 26, 2009 Share Posted October 26, 2009 [quote name='Kirky' post='631757' date='Oct 20 2009, 07:25 PM']I've ordered the parts and am going to have a go this weekend. Do you reckon it needs the carpet on the underside or could I just glue the platfoam direct to the wood?[/quote] You can glue the platfoam to the wood. That's what I did. Quote Link to comment Share on other sites More sharing options...
Kirky Posted December 3, 2009 Share Posted December 3, 2009 OK I finally got round to making mine. Not sure it was all that much cheaper than buying one in the end, but had fun making it. Haven't tried it in anger yet. [attachment=37592:GRAMMA_1.JPG][attachment=37593:GRAMMA_2.JPG][attachment=37594:GRAMMA_3.JPG] Quote Link to comment Share on other sites More sharing options...
Rich Posted December 3, 2009 Share Posted December 3, 2009 Looks better than the real thing Very nice work. Quote Link to comment Share on other sites More sharing options...
Kirky Posted December 3, 2009 Share Posted December 3, 2009 Thanks I'm no DIY expert. Looking forward to hearing what difference it makes. Quote Link to comment Share on other sites More sharing options...
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