|
|
Post by Sovereign on Mar 27, 2016 14:37:38 GMT
Are there any guidlines for the size of the open backed box behind my 18" driver and I presume it should be braced and lined with wadding of some sort? Keith. Not sure of size mate, surely it would be specified by the design build that you follow. My back box is single ply but it is braced i/2 way across the middle of the box. Normal PVA wood glue was used. |
|
|
|
Post by ChrisB on Mar 27, 2016 14:46:40 GMT
I wouldn't think there would be any purpose to any sort of wadding in an open baffle design, would there?
|
|
|
|
Post by pre65 on Mar 27, 2016 14:57:59 GMT
I wouldn't think there would be any purpose to any sort of wadding in an open baffle design, would there? 
OB's are easy to get reasonably good by trial and error.
Really good ones need a lot of attention, and some maths.  |
|
|
|
Post by ChrisB on Mar 27, 2016 15:38:06 GMT
Erm, stick wadding behind the bass driver and it ceases to be an open baffle design, surely? Then it starts to become more like a Hartley-Turner Boffle.
|
|
|
|
Post by Sovereign on Mar 27, 2016 16:28:06 GMT
I wouldn't think there would be any purpose to any sort of wadding in an open baffle design, would there? Yes forgot to say , there is no wadding in my back box |
|
|
|
Post by ChrisB on Mar 27, 2016 16:43:19 GMT
I've just posted a thread about Hartley & his Boffle here |
|
|
|
Post by John on Mar 27, 2016 17:37:32 GMT
|
|
|
|
Post by keith1962 on Mar 27, 2016 18:31:21 GMT
Some excellent articles and information there chaps. Looks like I should get used to doing some maths or just stick the Fane into a flat baffle and use amp power and digital eq to sort it out below 300Hz :-)!
I'm sure once they are built and connected up to the digital xo I will end up with crossovers in different places to where I first thought they were going to be:-)!
I only asked about wadding in the back box as the Fane 18" I saw and heard at Scalford last week were in a box that was just big enough to hold them and lined with damping but not braced. They sounded very good indeed but the builder confirmed he had not used any form of calculation to come up with the size etc.
John, what did you use for your 10mm isolating mounting board under your drivers?
Keith.
|
|
|
|
Post by John on Mar 27, 2016 18:46:00 GMT
i had a 10mm board made with mdf which the drivers are bolted too and then the mounting board is bolted to the baffles
The Goldwoods 18 create some nice bass too
If you going active you have a bit more flexibility with the size of the baffles.
My first baffles I followed a prescribed route, my next I went my own way and that worked out better for me
|
|
|
|
Post by keith1962 on Mar 30, 2016 17:34:24 GMT
A couple of very interesting threads on hifiwigwam about people who have built Lampizator P17s. Search for Lampizator P17 Endorphine and look for the threads by Steve RD and AmDismal (I think that's how they're spelled). Steve's are stunning with the walnut worktop baffles but Adams are really nice also. This is the design I will be following but with my two Beyma drivers instead of the Saba pair. I will go with the 18" Fane in the open backed box at the bottom. Interesting info about setting the mid and tweeter off to one side of the vertical central axis line.
Keith.
|
|
|
|
Post by John on Mar 31, 2016 4:38:44 GMT
The P17 is a nice sounding design
The Beymer drivers is a great route to go down
|
|
|
|
Post by keith1962 on Mar 31, 2016 9:56:23 GMT
Lowthers and Mauhorns selling, ordered Fane Colossus 18XB, crown xli1500 and Beyma 12p80nd, already have tpl150s. SJS Arcadia pre and Audio Note Dac 2.1X Sig sold 3 weeks ago, Speedysteve has almost finished my Najda Dac/pre/crossover, Hiraga Le Monstre also almost finished and getting the wood next week for the cabinets. It's all getting a bit serious!!!!
|
|
|
|
Post by MartinT on Mar 31, 2016 10:05:38 GMT
Wow, that's a lot all in one go. Hope you'll listen to one change at a time?
|
|
|
|
Post by keith1962 on Mar 31, 2016 13:32:36 GMT
Well, not really. A wide band speaker and cabinet is being replace by a 3 way active speaker. A preamp and Dac are being replaced by an all in one pre Dac crossover. I am currently running the Leben integrated with Ressonessence Concero as a Dac (was previously a spdif bridge between PC and the AN Dax) so will be able to substitute the Najda first with Leben as a power amp to see if there is any difference with the Lowthers. Leben will be power amp for the tpl 150s eventually.
No way to do the speaker change without all of the other changes as going active not passive.
Keith.
|
|
|
|
Post by Sovereign on Mar 31, 2016 14:28:57 GMT
Some excellent articles and information there chaps. Looks like I should get used to doing some maths or just stick the Fane into a flat baffle and use amp power and digital eq to sort it out below 300Hz :-)! I'm sure once they are built and connected up to the digital xo I will end up with crossovers in different places to where I first thought they were going to be:-)! I only asked about wadding in the back box as the Fane 18" I saw and heard at Scalford last week were in a box that was just big enough to hold them and lined with damping but not braced. They sounded very good indeed but the builder confirmed he had not used any form of calculation to come up with the size etc. John, what did you use for your 10mm isolating mounting board under your drivers? Keith. Yes the Wam is full of P17 articles, good reading. I bought my P17s from one of them, can't remember which |
|
|
|
Post by Sovereign on Mar 31, 2016 14:32:38 GMT
Well, not really. A wide band speaker and cabinet is being replace by a 3 way active speaker. A preamp and Dac are being replaced by an all in one pre Dac crossover. I am currently running the Leben integrated with Ressonessence Concero as a Dac (was previously a spdif bridge between PC and the AN Dax) so will be able to substitute the Najda first with Leben as a power amp to see if there is any difference with the Lowthers. Leben will be power amp for the tpl 150s eventually. No way to do the speaker change without all of the other changes as going active not passive. Keith. Interestingly I plan to go down almost the exact same route, I have had my P17s for close to 4 years maybe. My health is a bit up the spout at the moment but when I'm on my feet I plan to build another two amps and go active, I have the active cover, just need to build the amps. |
|
|
|
Post by keith1962 on Mar 31, 2016 17:41:17 GMT
Some excellent articles and information there chaps. Looks like I should get used to doing some maths or just stick the Fane into a flat baffle and use amp power and digital eq to sort it out below 300Hz :-)! I'm sure once they are built and connected up to the digital xo I will end up with crossovers in different places to where I first thought they were going to be:-)! I only asked about wadding in the back box as the Fane 18" I saw and heard at Scalford last week were in a box that was just big enough to hold them and lined with damping but not braced. They sounded very good indeed but the builder confirmed he had not used any form of calculation to come up with the size etc. John, what did you use for your 10mm isolating mounting board under your drivers? Keith. Yes the Wam is full of P17 articles, good reading. I bought my P17s from one of them, can't remember which I wondered if yours were from one of these builds. They look like Adam's (AmDismal) as he joined two sheets of ply together to make a thicker baffle and rounded the edges very nicely. How low do you reckon the bass goes with yours? Steve RD with the walnut baffles (and really nice room!!) didn't seem to get them to go low enough, at least at first. Could have been the huge room they were in! Keith. |
|
|
|
Post by Sovereign on Mar 31, 2016 20:07:21 GMT
I've got no idea how low mine go, not got any measuring devices. Low enough I'd say.
|
|
|
|
Post by MartinT on Apr 1, 2016 4:47:42 GMT
There are some frequency spectrum analyser apps for phones. Not wonderful, but worth a play with.
|
|
|
|
Post by Eduardo Wobblechops on Apr 1, 2016 14:55:41 GMT
I've got no idea how low mine go, not got any measuring devices. Low enough I'd say. Probably around 30Hz. |
|
