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 Post subject: DIY speakers
PostPosted: 04 Sep 2008, 09:51 
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Joined: 04 Sep 2008, 09:35
Posts: 179
Location: Menton, France
Hi all,

new to the forum, and i'm sure i'll ug you all in times to come.

so just started in diying my own speakers, i know a bit of audio, but diy stuff (is at the mo) beyond me.

I about to attack the NWA 10 ported subwoofer, and my first bug question is......

Whats the easiest way to cut the big hole in the front? i've been told just to drill a hole and then cut round with a jig saw. is there another way?

also for this woofer as i live in france, and mach 5 aren't around that much, what criteria do i look for, to attain a similar sound from another brand of woofer?

cheers for the help and speak to you soon

sabs


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 Post subject: Re: DIY speakers
PostPosted: 04 Sep 2008, 10:51 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
A router with a circle tool is the "proper: way to do it...perfect hole everytime and all that...I have always used the jigsaw method though.

Many rough cut with a saw and then route it round.

Lastly, you cannot freely change drivers without changing the parameters of the enclosure...each driver has unique specs (like a snowflake) and just slapping a driver in a box will never work out right...unless you are the luckiest man on earth and in that case go to a casino instead of rolling the dice on a sub-box.

That being said, if you find a driver you like post up some specs and we can help out.


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 Post subject: Re: DIY speakers
PostPosted: 04 Sep 2008, 11:19 
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Joined: 04 Sep 2008, 09:35
Posts: 179
Location: Menton, France
cheers for the info, and future advice.

Casino is not a good idea i work round the corner, and no one wins, hail the lottery.

Also is the plate amp specific aswell or can i just plonk that in the box?


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 Post subject: Re: DIY speakers
PostPosted: 04 Sep 2008, 12:12 
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Joined: 28 May 2008, 21:53
Posts: 4580
Location: Winnipeg, CANADA
Hi Sabs and welcome to the forum.

As Bill mentioned, a circle jig is the proper way to do cut the hole. I use a router and a Jasper Jig
Attachment:
Jasper-Tools-Circle-Giude.JPG

Very simple to use. So simple in fact that I actually managed to counter sink a driver with it the very first time I used a router!

Which is the NWA 10 ported subwoofer you plan on building?

Mach 5 Audio is in Canada, US and Australia. Shipping to France would be very expensive. I suggest you find a local subwoofer supplier to keep the shipping costs reasonable. Then use WinISD or something similar to come up with a box design. We will be glad to help you along if you have any questions.

Cheers


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 Post subject: Re: DIY speakers
PostPosted: 04 Sep 2008, 14:31 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
Plate amps are pretty much universal as long as they meet your power needs.

Keep in mind that the amps are usually rated at 4ohms and will put out significantly (half or only slightly better) less watts with an 8ohm driver...so look for a 4ohm or dual 8ohm vc driver.

I use Unibox, it is a free excel based program...works pretty good...I used to do it all by hand with a calculator, but thats a PITA and this is soooo much faster. :up:


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 Post subject: Re: DIY speakers
PostPosted: 04 Sep 2008, 19:21 
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Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
This is what I use.
http://www.holepro.com/drillpress.html
You have to start VERY slow. Slow as in almost zero depth, but very fast rotation. Then just let the razor sharp edges cut touch the veneer. It makes a nice circular slice out of the veneer. THEN you can drill the rest in a few seconds. I then use a rasp and get the splinters off of the back. Router might be less mess, I dont know. But this way works for me and I did an 11" hole last time.
Careful to make sure your drill press will allow the diameter of the saw and then size of board you are cutting the hole out of. I had to use my hand drill, but it was easy anyway.
Ri

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 Post subject: Re: DIY speakers
PostPosted: 05 Sep 2008, 06:45 
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Joined: 04 Sep 2008, 09:35
Posts: 179
Location: Menton, France
gmilitano wrote:
Which is the NWA 10 ported subwoofer you plan on building?


Hi G sorry this is my bad typing it's your MAW 10 ported subwoofer that i'm using as a basis, then trying to adapt it to the driver i can get in france.

Like the advice received previously i will try to find the driver then build from there?

Thank for the circle guide pic though

sabs


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 Post subject: Re: DIY speakers
PostPosted: 05 Sep 2008, 07:17 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Ok, for reference, here is a link to the MAW-10 10" Ported Subwoofer Project.

Yeah, pick out a couple of model that you can get easily and then we can look at them.

Cheers

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 Post subject: Re: DIY speakers
PostPosted: 06 Sep 2008, 06:01 
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Joined: 04 Sep 2008, 09:35
Posts: 179
Location: Menton, France
Ok, been doing my home work.

Thanks to billnchristy i've looked at the plate amp, and it details that it delivers 1x50w 8ohms, and 1x80w 4ohms. In this case is it still better to get a 4ohms driver?

Hey G, cheers for the cutting info all sorted.

Coupled with the plate amp info, i've found these two possible drivers readily available in france.

1. Visaton w250s-4ohms or 8ohms
2. Eminence Gamma 10 8ohms

Both 10" and not mega pricey.
Unibox I've got and started to work my way through, slowly coz it look like it can get complicated very quickly.

The next question on my long list. Do i need a filter for the sub, or is that something in the amp?

Cheers
sabs


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 Post subject: Re: DIY speakers
PostPosted: 06 Sep 2008, 09:27 
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Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
Well, that depends on your plate amp and your source to the plate amp. Sometimes the plate amps have crossovers built in and you can dial in your frequency. Some receivers have a special subwoofer output that can also have selectable frequency cutoff. Or you can build a crossover yourself if you need to. Thats something else you can find good help for here.
Check your plate amp and the receiver or whatever you are using to send signal to the plate amp.
Ri

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