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Old 13th July 2012, 02:53 AM   #1
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Default needing DIY subwoofer ideas.

for my listening room i'm building two matching subwoofer cabinets that can also be used as speaker stands for my NS-1000m speakers.
I need to have my speakers 20" off the floor.

Amplification: yamaha m-4 amplifier
Filter: FMOD (Filter Module) Low Pass RCA Level Crossover (undecided freq)

cabinet size and woofer undecided. i'm wanting recommendations.
i have adequate woodworking skills and all the tools necessary, but don't know much about speaker design.
my room size is 13'x10'x8'

this image i found online i like.. i would like to have my subwoofers look like this. but perhaps instead of a fabric grill, i use a metal mesh one like on my yamaha Ns-1000m speakers.
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Old 13th July 2012, 04:54 AM   #2
Einric is offline Einric  United States
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What are your frequency extension needs?
What's your budget?

Last edited by Einric; 13th July 2012 at 04:56 AM.
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Old 13th July 2012, 05:43 AM   #3
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I would say i could possibly spend up to about $400 on the drivers. but would prefer to spend less. i would be more comfortable with $300 per pair.
but beggars cant be choosers.. i don't know whats available yet.

been looking around on the web.. i'm getting mixed information on these Yamaha NS-1000m's
some saying they go from 40hz-20khz
than viewing frequency responce graphs that clearly show 90hz-20khz..
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Old 13th July 2012, 05:51 AM   #4
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Default At a higher pricepoint...

Some really great subs from Rhythmik, awesome sound and way deep.

Rythmik Audio • Servo subwoofer Products - Custom Install series
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Old 13th July 2012, 06:23 AM   #5
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Quote:
Originally Posted by Jack Caldwell View Post
Some really great subs from Rhythmik, awesome sound and way deep.

Rythmik Audio • Servo subwoofer Products - Custom Install series
those all rely on the included amplifier..
i would like to use my yamaha m-4 as my subwoofer amplifier
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Old 13th July 2012, 06:29 AM   #6
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Quote:
Originally Posted by aidynphoenix View Post
Filter: FMOD (Filter Module) Low Pass RCA Level Crossover (undecided freq)
FMOD is a compromised PLLXO. I'd suggest doing your own. TLS.org | Passive Line-Level Crossover

To use as stands you'll need 2 woofers. I can recommend the ones i choose, CSS SDX10. Get them at the old price while you can. They are going up to $180 (still good value)

dave
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Old 13th July 2012, 07:11 AM   #7
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Originally Posted by planet10 View Post
FMOD is a compromised PLLXO. I'd suggest doing your own. TLS.org | Passive Line-Level Crossover

To use as stands you'll need 2 woofers. I can recommend the ones i choose, CSS SDX10. Get them at the old price while you can. They are going up to $180 (still good value)

dave
Thanks Dave.

that woofer design calls for a 1cuft box. that seems pretty small but i can do a box within a box.

and i will be doing something about the FMOD.
the calculator they offer is a .xls file.. i don't have a application to open that.
and i don't understand the math involved in determining what value components i need to make a crossover. it looks like its just a capacitor and a resistor. want to assist me with the correct values for 40hz lowpass? and should i be useing film capacitors and audio grade resistors?
~john

Last edited by aidynphoenix; 13th July 2012 at 07:22 AM.
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Old 13th July 2012, 07:21 AM   #8
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also.. will 120w be adaquate per subwoofer?
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Old 13th July 2012, 07:48 AM   #9
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You could use a high-powered class D amp built into the cabinet.
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Old 13th July 2012, 08:16 AM   #10
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Quote:
Originally Posted by aidynphoenix View Post
that woofer design calls for a 1cuft box. that seems pretty small but i can do a box within a box.
You can fit it into that small a box, ideal to my mind would be between ~60-130 litres.

Quote:
and i will be doing something about the FMOD.
the calculator they offer is a .xls file.. i don't have a application to open that.
and i don't understand the math involved in determining what value components i need to make a crossover. it looks like its just a capacitor and a resistor. want to assist me with the correct values for 40hz lowpass? and should i be useing film capacitors and audio grade resistors?
The math is just simple arithmetic. No more complex than figuring out how how big to cut the pieces of the box given a target volume.

The spreadsheet opens fine in Open Office/Neo Office.

120 W shouldbe fine, i'm powering mine with 100W (but i have 4 of them -- and a LARGE room)

dave
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