!!sup!!my Fellow Diy'ers A Few Last Q's For My Sub Configeration.... - diyAudio
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Old 28th April 2002, 06:22 AM   #1
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Join Date: Apr 2002
Location: CA
Cool !!sup!!my Fellow Diy'ers A Few Last Q's For My Sub Configeration....

WELL AS SOME OF YOU MIGHT KNOW I HAVE ALMOST FINNISHED MY FIRST HOMETHEATER SUB....
FOR YOU GUYS WHO DON'T KNOW LET ME FILL YOU IN!

SPEC'S:
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1. CUSTOM MADE 3/4 INCH MDF ENCLOSURE--PORTED--2 CU. FEET
2. PARTSEXPRESS 250w RMS @ 4ome SUB AMP
3. BLAUPUNKT PCwi1200 12" SUBWOOFER 200w RMS 600w PEAK
4. PNR AEROPORT KIT 3"---13INCHS LONG TUNING BOX TO 25Hz
5. DAYTON AUDIO BLACK CHROME SPEAKER SPIKES
6. ABOUT 1INCH CRAFT-FOME DAMPINING
(CHEAP AND WORKS WELL)
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WELL THATS ABOUT IT....
I AM ACTUALY PUTING THE FINISHING COAT ON; ON MONDAY.....

WELL JUST A FEW Q'S ABOUT CONFIGURING MY SUB AMP FOR OPTUM OUT PUT.....
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THE SUB IS GOING TO BE CONNECTED TO A DETITACATED SUBWOOFER OUT PORT FROM THE BACK ON MY DTS/DD 5.1 RECIVER.....
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NOW THAT YOU HAVE THE BACKGROUND HERE ARE THE QUESTIONS......

1. WHAT SHOULD I SET THE CROSSOVER FREQUENCY TO(40Hz-160Hz)?
2. WHAT SHOULD I SET MY PHASE CONTROL TO(0-180 DEGREES)?
3. WHAT SHOULD THE VOLUME SETING ON THE AMP BE SET FOR?
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THANKS,
SLICE

NOTE: I AM GOING TO BE POSTING PICTURES OF THE FINAL PROJECT IN A FEW DAYS....IN A NOTHER SUBJECT ENTRY....
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Old 28th April 2002, 06:42 AM   #2
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Default Re: !!sup!!my Fellow Diy'ers A Few Last Q's For My Sub Configeration....

Quote:
Originally posted by slicemaster101

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NOW THAT YOU HAVE THE BACKGROUND HERE ARE THE QUESTIONS......

1. WHAT SHOULD I SET THE CROSSOVER FREQUENCY TO(40Hz-160Hz)?
2. WHAT SHOULD I SET MY PHASE CONTROL TO(0-180 DEGREES)?
3. WHAT SHOULD THE VOLUME SETING ON THE AMP BE SET FOR?
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1. Most DVD soundtracks etc are designed for 80Hz crossover

2. This will depend on the room .... play with it till it sounds right.

3. set it for a volume that does not clip under normal circumstances.
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Old 28th April 2002, 11:43 PM   #3
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ya but what is PHASE CONTROL
and what does the crossover do?
and what frequencies does the sub put out when it is set to 80hz
does it put out every thing below 80hz or every thing above?

thanks
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Old 29th April 2002, 03:02 AM   #4
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Quote:
Originally posted by slicemaster101
1.ya but what is PHASE CONTROL
2.and what does the crossover do?
3.and what frequencies does the sub put out when it is set to 80hz, does it put out every thing below 80hz or every thing above?

thanks
1. It changes how the waveform arrives @ your ears wither by way of a time delay or by changing the shape of the electrical signal .... the idea is, if it is out of phase @ the crossover point, alot of the sound @ and around the crossover point will be partially cancelled when the 2 sound waves (1 from the front speakers and 1 from the sub) meet @ your ears. You want to set it so that both sound waves have the same phase @ your listening position and this is a matter of listening till it sound the best.

2. The crossover determines which speaker/s play which frequencies and sends each part of the soundtrack to the right speaker/s.

3. The crossover for the sub is called a low pass filter so it sends everything below the set frequency to the sub. So, if the crossover is set @ 80Hz, the sub plays everything below 80Hz.
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Old 29th April 2002, 09:03 PM   #5
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ok but what is the relation on phase control to the room and the posision of the sub?


keep postin....

thanks,
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it is always better if you build your own...
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Old 30th April 2002, 02:05 AM   #6
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that's next to impossible to say because any piece of furniture you have in the room etc will affect it. Generally speaking you 2 waveforms of the same frequency will be in phase relative to each other when you are located @ some point that can be measured in x*wavelength from each of the 2 sources .... the x can be different for the 2 sources as long as both x's are whole integers. Wavelength is the length of the sound wave in question.
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