DIY replacement surround?

Ian J · 9th December 2009, 05:20 PM

Hi all,
I've recently acquired some ~25yr old SEAS 13 F-GMBX which have rotted foams. Though these are a mid driver, careful low level listening (and a look at the response graphs) show promise up to ~8kHz. I'd like to try and use them as a wide/full-range (Fs~75Hz). Would anyone have advice about DIY replacement surrounds (as in actually making then yourself) to aid in this ambition? I'm tempted to try fabric - what would be the best way to treat it to be supple enough yet soundproof?
Crazy idea I know, but it's nearly Christmas...
Ian

mp9 · 9th December 2009, 11:00 PM

one idea,
1/2" whatever ø you need, round router bit and corresponding rounding over bit to make a mold of wood which you can pour latex in to form the surround.
****-u-
↓
¯U¯

InclinedPlane · 9th December 2009, 11:59 PM

I'm perhaps being too creative here, but aside from leather, which is supposed to be excellent, I wanted to try NO surround. Fertin got me thinking, and for the hell of it I was going to take a couple of cheap old speakers with the rolled paper edge and cut it, then affix four tightly-stretched rubber bands from the frame to the dust cap in a pie-slice shape. It would be fun to measure and hear the result (if any).

Of course with your drivers, the surround gap would have to be filled to prevent low/mid cancellation. I also like the idea of the old CV strokers. With an inside/outside spider, you could dispense with the surround and it would look better than my idea and Fertin's (which I think looks fugly, ha).

Steerpike · 10th December 2009, 12:11 PM

There is a Japanese guy who makes a mould from tubular polystyrene foam, cut into a half circle lengthwise. Bent into a circle, then glued to a flat board.
Over that he places jersey cloth, and paints it with polyurethane.

mp9 · 10th December 2009, 07:56 PM

how much of a problem will he have if not measuring/installed surround due to different materials affect on TS parameters?

9th December 2009, 05:20 PM	#1
Ian J diyAudio Member Join Date: Feb 2003 Location: Oxford, England	DIY replacement surround? Hi all, I've recently acquired some ~25yr old SEAS 13 F-GMBX which have rotted foams. Though these are a mid driver, careful low level listening (and a look at the response graphs) show promise up to ~8kHz. I'd like to try and use them as a wide/full-range (Fs~75Hz). Would anyone have advice about DIY replacement surrounds (as in actually making then yourself) to aid in this ambition? I'm tempted to try fabric - what would be the best way to treat it to be supple enough yet soundproof? Crazy idea I know, but it's nearly Christmas... Ian __________________ 'We demand guaranteed, rigidly defined areas of doubt and uncertainty!' - Douglas Adams

10th December 2009, 12:11 PM	#4
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	There is a Japanese guy who makes a mould from tubular polystyrene foam, cut into a half circle lengthwise. Bent into a circle, then glued to a flat board. Over that he places jersey cloth, and paints it with polyurethane. __________________ Steerpike's Toybox

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9th December 2009, 11:00 PM	#2
mp9 diyAudio Member Join Date: Jun 2006	one idea, 1/2" whatever ø you need, round router bit and corresponding rounding over bit to make a mold of wood which you can pour latex in to form the surround. ****-u- ↓ ¯U¯

9th December 2009, 11:59 PM	#3
InclinedPlane diyAudio Member Join Date: Jan 2007 Location: Maine	I'm perhaps being too creative here, but aside from leather, which is supposed to be excellent, I wanted to try NO surround. Fertin got me thinking, and for the hell of it I was going to take a couple of cheap old speakers with the rolled paper edge and cut it, then affix four tightly-stretched rubber bands from the frame to the dust cap in a pie-slice shape. It would be fun to measure and hear the result (if any). Of course with your drivers, the surround gap would have to be filled to prevent low/mid cancellation. I also like the idea of the old CV strokers. With an inside/outside spider, you could dispense with the surround and it would look better than my idea and Fertin's (which I think looks fugly, ha).

10th December 2009, 07:56 PM	#5
mp9 diyAudio Member Join Date: Jun 2006	how much of a problem will he have if not measuring/installed surround due to different materials affect on TS parameters?

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