Newbie with a question

Diesel Nut · 18th June 2009, 06:42 PM

I tried searching this out, but its all greek to me.

Ok, about 4 years ago I had a local shop install a nav system for me in my Truck. While at the shop the installer showed me his "creation". It was a sub box approx 4' tall and I would say 6"x10" square, and used a speaker from an alarm clock. The amount of bass and sound this thing produced in his shop was incredible!

So, I have a cheapo power sub from a Wally World special sound system. What I want to do is build a similarly designed box with that sub, amp, ect so it will seamlessly attach to the current system we are using in our shop. We do listen to a variety of music. The sub we are wanting to use is 5 1/2"

So, where might I find the calculator and ideas on building this little shop toy?

I don't remember what he called it, but the phrase 1/4 octave or 1/4 wave sounds about right, but heck its been 5 years since I saw it.

Thanks!

MaVo · 18th June 2009, 09:12 PM

It could have been a horn speaker, as those are usually 1/4 WL of the lowest frequency they can produce long, or maybe a transmission line. However, if you want to design your own, this will invole alot of theory learning. Hornresp is your simulator of choice. Google will lead to alot of theory. Good luck

Diesel Nut · 19th June 2009, 07:58 PM

Right on. I will be doing some more research. For now, we were bored so we built one shooting from the hip. Its 48" tall, but the port winds up being 96". mounted the sub and connected everything. We did pull the amp out of the old box, then wound up putting it back in after taking the box to the table saw.

So, we ended up building a separate sub amp for 120V use, and mounted a 4" 120v fan inside it to move some air around and keep everything cool. We did reuse the original volume control and remounted it on the panel for the amp. So, all in all it was a cool little project to attempt. It sounds OK but we have much more to learn before building the next one.

Henkjan · 20th June 2009, 11:02 AM

1/4 wave is usually a TL or transmission line

see www.quarter-wave.com

boydon_lepasci · 23rd June 2009, 01:12 AM

Keep in mind that random chance is about as likely to produce a good enclosure as the lottery is to be a good retirement plan. At some point you will need a reliable set of driver measurements to work with, whether you get them for your current driver or obtain a different driver with known accurate measurements.

18th June 2009, 06:42 PM	#1
Diesel Nut diyAudio Member Join Date: Jun 2009	Newbie with a question I tried searching this out, but its all greek to me. Ok, about 4 years ago I had a local shop install a nav system for me in my Truck. While at the shop the installer showed me his "creation". It was a sub box approx 4' tall and I would say 6"x10" square, and used a speaker from an alarm clock. The amount of bass and sound this thing produced in his shop was incredible! So, I have a cheapo power sub from a Wally World special sound system. What I want to do is build a similarly designed box with that sub, amp, ect so it will seamlessly attach to the current system we are using in our shop. We do listen to a variety of music. The sub we are wanting to use is 5 1/2" So, where might I find the calculator and ideas on building this little shop toy? I don't remember what he called it, but the phrase 1/4 octave or 1/4 wave sounds about right, but heck its been 5 years since I saw it. Thanks!

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18th June 2009, 09:12 PM	#2
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	It could have been a horn speaker, as those are usually 1/4 WL of the lowest frequency they can produce long, or maybe a transmission line. However, if you want to design your own, this will invole alot of theory learning. Hornresp is your simulator of choice. Google will lead to alot of theory. Good luck

19th June 2009, 07:58 PM	#3
Diesel Nut diyAudio Member Join Date: Jun 2009	Right on. I will be doing some more research. For now, we were bored so we built one shooting from the hip. Its 48" tall, but the port winds up being 96". mounted the sub and connected everything. We did pull the amp out of the old box, then wound up putting it back in after taking the box to the table saw. So, we ended up building a separate sub amp for 120V use, and mounted a 4" 120v fan inside it to move some air around and keep everything cool. We did reuse the original volume control and remounted it on the panel for the amp. So, all in all it was a cool little project to attempt. It sounds OK but we have much more to learn before building the next one.

20th June 2009, 11:02 AM	#4
Henkjan diyAudio Member Join Date: Jan 2006 Location: Berkel en Rodenrijs	1/4 wave is usually a TL or transmission line see www.quarter-wave.com

23rd June 2009, 01:12 AM	#5
boydon_lepasci diyAudio Member Join Date: Apr 2005 Location: Salt Lake	Keep in mind that random chance is about as likely to produce a good enclosure as the lottery is to be a good retirement plan. At some point you will need a reliable set of driver measurements to work with, whether you get them for your current driver or obtain a different driver with known accurate measurements.

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