Subs without Phase control?

[xtreme02gt]

What if I have two subs now but they don't have a phase control knob. How would I get them in phase " IF " they are out of phase? Or would they be in phase no mater what? How would I do it?

I know the eD A2-300's have phase control, but the one I have in the living room and the other that will be putting in the living room don't

[crazyBLUE]

Originally Posted by xtreme02gt

What if I have two subs now but they don't have a phase control knob. How would I get them in phase " IF " they are out of phase? Or would they be in phase no mater what? How would I do it?

I would think if there was 2 same length RCA cables connecting the subs , that there would be no problem . I'm sure Big Daddy will have something to say if I am wrong .

[pokefan]

I'm not sure exactly when you would need phase control since I don't have a use for it but if you had to switch it with no other options you could pull the sub and switch the + and - terminals.

[xtreme02gt]

Originally Posted by pokefan

I'm not sure exactly when you would need phase control since I don't have a use for it but if you had to switch it with no other options you could pull the sub and switch the + and - terminals.

No, I mean I want to make sure both subs sound the same. Not one louder than the other, or one of them a little out of sync with the other sub.

BTW: Both subs are the same. Same size, same brand, same power!

[Driver_King]

Originally Posted by xtreme02gt

What if I have two subs now but they don't have a phase control knob. How would I get them in phase " IF " they are out of phase? Or would they be in phase no mater what? How would I do it?

I know the eD A2-300's have phase control, but the one I have in the living room and the other that will be putting in the living room don't

The only thing you'd be able to do is run an auto-calibration system to get the phase set in the receiver or you can manually set the average distance from the subs to your listening position if that auto calibration is not an option.

[xtreme02gt]

Originally Posted by Driver_King

The only thing you'd be able to do is run an auto-calibration system to get the phase set in the receiver or you can manually set the average distance from the subs to your listening position if that auto calibration is not an option.

I don't know if it is... I have the Yamaha RX-V765 and it has dual sub set-up. But I don't know if it will calibrate both subs. How can I find out if it will?

[erict]

Originally Posted by xtreme02gt

I don't know if it is... I have the Yamaha RX-V765 and it has dual sub set-up. But I don't know if it will calibrate both subs. How can I find out if it will?

The only way to properly setup two subs is to do them independently using an spl meter.

[ryandubbz]

switch the positive and negative terminals around on one sub

[Driver_King]

Originally Posted by xtreme02gt

I don't know if it is... I have the Yamaha RX-V765 and it has dual sub set-up. But I don't know if it will calibrate both subs. How can I find out if it will?

It won't calibrate each subwoofer individually but will calibrate both as one. The way auto calibration systems work is by relaying test tones through your speakers to the calibrated mic back to the receiver where algorithms, EQ's, and filters are intelligently applied to sort through the different possible situations and determines which settings should be used. You will need to calibrate each subwoofer to 75dB at listening position with an SPL meter before calibrating with the auto calibration system to get the best results.

[xtreme02gt]

Originally Posted by Driver_King

It won't calibrate each subwoofer individually but will calibrate both as one. The way auto calibration systems work is by relaying test tones through your speakers to the calibrated mic back to the receiver where algorithms, EQ's, and filters are intelligently applied to sort through the different possible situations and determines which settings should be used. You will need to calibrate each subwoofer to 75dB at listening position with an SPL meter before calibrating with the auto calibration system to get the best results.

Ok, how do I do that? With this receiver the volume knob still works with the pink noise, so I can turn the pink noise as loud as I want to.. So how do I set the subs to 75db?

[ryandubbz]

Originally Posted by xtreme02gt

Ok, how do I do that? With this receiver the volume knob still works with the pink noise, so I can turn the pink noise as loud as I want to.. So how do I set the subs to 75db?

you will need to buy an spl meter, you can get one at radioshack for about $50. Theres alot of members on here who use this one from radioshack, Digital Sound meter

[kareface]

Originally Posted by xtreme02gt

Ok, how do I do that? With this receiver the volume knob still works with the pink noise, so I can turn the pink noise as loud as I want to.. So how do I set the subs to 75db?

You'll be calibrating 2 subs. Depending on which of the RS meters you'll need to get the offsets, especially for calibration below 200hz. Bring the volume levels till your front are around 75db at a range of frequencies. Start with a frequency that is less likely to be off, 800-1000. Once you get them about to 75 DB, you should then calibrate each sub individually to around 69db. Turn on both of the subs to make sure they sum to 75.

[jlafrenz]

Originally Posted by xtreme02gt

Ok, how do I do that? With this receiver the volume knob still works with the pink noise, so I can turn the pink noise as loud as I want to.. So how do I set the subs to 75db?

Set the volume to a point around where you like to watch movies at. Then at that volume level make sure all the speakers are putting out 75db by using the gain/trim setting in your receiver. Do not touch the actual volume know once you start level matching.

Also, kareface has a good suggestion if you do one sub at a time by setting each one to about 69db.

And remember, feel free to adjust your subs from this point to tailor it to your liking.