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Speaker build for a SNA member


Gee Emm

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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!

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84edce79310baabd6dcb3d8712717766.jpg

 

 

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Any more progress to show ? Listening to them yet ?

Here ya go...
Internal hardwood offset braces
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Prescribed oval baffles for baffle step correction. Ovals are now stained a contrasting colour to the baffles.
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Final glue up. Ovals are dry doweled, and hand in place by woofer affixed through oval and front baffle.
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Stain, clear, sand, clear, repeat...
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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.
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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.

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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 :) 

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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.

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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. :)

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Guest BobbyD
On 19/07/2017 at 7:46 AM, Gee Emm said:

Different life now. It's warm and sunny outside emoji1303.pngall the time.
Anyhoo. Getting to the end of this project.
One more clear coat to go.
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Very nice job on the cabinets @Gee Emm.:thumb:

Curious why the inductor and cap when it's a Tang Band full range driver?

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@SETsergio
So 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]

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