New guy wanting DIY monitors for home office - AVS Forum
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post #1 of 9 Old 10-15-2013, 08:51 PM - Thread Starter
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Hello everyone, I am super new to this forum, but I am branching off of my car audio forum to dig deeper into home audio. As the title says I would like to build some home audio monitors for my home office. I will build a horn enclosure for a 15" sub and will toss some ceiling speakers in to complete the 4.1 however I would like some of my own hand built monitors. I have a pair of 8s that have no name to speak of that were designed and built by a buddy of mine for a car audio application.
Specs include:

Recommended usable range: 40hz – 1800hz @ 24dbz
Power handling without high-pass crossover: 90 watts rms
Power handling at recommend crossover point: 200 watts rms
Impedance: 4 ohms
Re: 3.79 Ohms
Fs: 58.2Hz
Le: .74 mh
Qms: 10.35
Qes: .53
Qts: .51
Linear Xmax: 3mm +/-
Xmax Mechanical Limit: 6mm +/-
BL: 7.64
Sd: 214.1 cm2
Cms: .335 mm/N
Mms: 22.4 grams
Vas: 21.8 Liters
Sensitivity: 91 (1w/1m)
Sensitivity2: 94.3 (2.83/1m)
Coil Diameter: 2”
Overall Diameter: 8.24” (209.2mm)
Cutout Diameter: 7.13” (181.1mm)
Mounting Depth: 3.6” (92mm)
Net Weight: 6.7 lbs (3kg)

I was thinking of sourcing or building my own crossovers to cross at approx 1200hz (as a buddy of mine and I swept one of these in various cu ft enclosures and easily hit 36-1200) and adding a ribbon application for the rest of the range.

Does anyone have any tips or pointers on using a car audio speaker in a home audio application and the adjustment that would need to be made power wise?
I am looking for any tips or pointers on enclosure material of choice as well as DIY vs 'off the shelf ' passive crossovers.

Like I said I am converting from car audio to home, so what works in a car may be totally different in a home build.

If it helps any I will be using my Behringer pro dcx2496 to assist with the basement office and "game" area tuning

Thanks for any and all your help and for bearing with another 'noob'

Jesse
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post #2 of 9 Old 10-15-2013, 10:17 PM
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that is how it always begins...

:-)

a good speaker with have a good transition through the crossover region, which probably means different sloped filters on the woofer and the tweeter. that gets all very complicated fast, so there is software to help figure it all out.

have a look for passive crossover design software.

but, before using the software, best to have some knowledge, so loudspeaker design cookbook might be worth reading.

and, some measurement tools so that you will know what your speakers are doing and will have inputs for the software.

there is some good information here: http://www.parts-express.com/resources.cfm

then there is the off axis response...

then there is baffle step correction...

then there is voicing/building eq into the speaker...

these are more for things to search on and read about.

or

you can buy a kit where some nerd has already figured all this stuff out.

there are lots of options and it really depends on what you are trying to accomplish. if you are looking for a fun project to experiment with, go for it. if you are hoping to nail a super high end passive crossover network on your first shot...

Listen. It's All Good.
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post #3 of 9 Old 10-16-2013, 06:37 AM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

that is how it always begins...

:-)

a good speaker with have a good transition through the crossover region, which probably means different sloped filters on the woofer and the tweeter. that gets all very complicated fast, so there is software to help figure it all out.

have a look for passive crossover design software.

but, before using the software, best to have some knowledge, so loudspeaker design cookbook might be worth reading.

and, some measurement tools so that you will know what your speakers are doing and will have inputs for the software.

there is some good information here: http://www.parts-express.com/resources.cfm

then there is the off axis response...

then there is baffle step correction...

then there is voicing/building eq into the speaker...

these are more for things to search on and read about.

or

you can buy a kit where some nerd has already figured all this stuff out.

there are lots of options and it really depends on what you are trying to accomplish. if you are looking for a fun project to experiment with, go for it. if you are hoping to nail a super high end passive crossover network on your first shot...

I will be digging deep into the variables you listed. As you can imagine mobile audio uses similar application, and much like MA I may also lean into a an active setup as well. I would like to build it all into the enclosure and possibly even build in an amp plate. Lord knows these 8" wide band mids will need some various testing to optimize their response. Might be more user friendly with an active crossover that can be 'tweaked' rather than a fixed passive.
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post #4 of 9 Old 10-20-2013, 02:56 PM - Thread Starter
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Does anyone else here use winISD for enclosure design?
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post #5 of 9 Old 10-22-2013, 11:50 AM
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Most people use WinISD for subwoofer enclosure design but I'm sure it works just as well for speaker design smile.gif

There are other programs too but I can't remember their names... lol
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post #6 of 9 Old 10-22-2013, 11:53 AM
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winisd is fine for below 200hz or so where the t/s parameters begin to dominate, but higher up there are other factors that winisd does not consider.

Listen. It's All Good.
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post #7 of 9 Old 10-22-2013, 02:59 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

winisd is fine for below 200hz or so where the t/s parameters begin to dominate, but higher up there are other factors that winisd does not consider.

Great piece of information! What program do you suggest. {;ease know I am running a Mac. I haven't set up the PC in the office yet.
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post #8 of 9 Old 10-22-2013, 03:54 PM
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my bad, i provided you with the wrong link. try this one:

http://techtalk.parts-express.com/showthread.php?219617-The-Speaker-Building-Bible
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post #9 of 9 Old 10-22-2013, 04:34 PM - Thread Starter
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Great link for speaker building and testing with some woofer enclosure programs. Ill see if I can use any of them. Thank you again. If you run across anything else feel free to toss it my way.

Jesse
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