Help me design a new pair of subwoofers. - Page 2 - AVS Forum
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post #31 of 50 Old 06-16-2012, 06:48 PM - Thread Starter
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Roger that, looks like I need to find a mic for REW.

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post #32 of 50 Old 06-16-2012, 07:08 PM
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You can also plug your audyssey Mic into your laptop. It won't be as accurate as a real Mic setup, but it will be close enough to get started.
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post #33 of 50 Old 06-16-2012, 09:05 PM - Thread Starter
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Quote:
Originally Posted by Jay1 View Post

You can also plug your audyssey Mic into your laptop. It won't be as accurate as a real Mic setup, but it will be close enough to get started.

Really? I was under the impression the Audyssey mic wouldn't work as most people on the forum say it doesn't do squat.

I found this informative little ditty on here, would I still require a soundcard for the setup if I'm using this equipment?

http://polaraudio.blogspot.com/2012/01/calibration.html

Thanks to Omegaslast for doing the leg work. I was hoping there was a cheaper alternative to getting the EQ setup but I guess that's not an option.

Panasonic TC P65s2
Onkyo TX-NR708
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4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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post #34 of 50 Old 06-16-2012, 09:16 PM
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How do you think audyssey calibrates your sub? If you have a sub in your setup right now, plug your mic in and run a rew sweep. You just have to watch the level of the sweep to make sure you arent clipping the input.
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post #35 of 50 Old 06-16-2012, 09:30 PM - Thread Starter
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I completely understand that portion of it, I just cant believe it would be that easy. Jay, if I'm understanding what you're saying I can simply plug the Audyssey mic into the mic input on my laptop, run REW and get a rough idea of what the sub is doing?

As far as the system stands right now I have to send my Onkyo out for repair due to problems with the amplifer not recognizing speakers connected to the unit when coming out of stand by. Thank goodness Onkyo is willing to take care of me, I just hope that the repair goes quickly.

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Onkyo TX-NR708
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post #36 of 50 Old 06-16-2012, 09:37 PM
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Quote:
Originally Posted by Big-Sexy907 View Post

I completely understand that portion of it, I just cant believe it would be that easy. Jay, if I'm understanding what you're saying I can simply plug the Audyssey mic into the mic input on my laptop, run REW and get a rough idea of what the sub is doing?
As far as the system stands right now I have to send my Onkyo out for repair due to problems with the amplifer not recognizing speakers connected to the unit when coming out of stand by. Thank goodness Onkyo is willing to take care of me, I just hope that the repair goes quickly.

Yes that's exactly what you can do. The peaks and nulls will be shown whether the mic is accurately calibrated or not, so you can see what needs to be EQ'd. You cant do any serious measurements, but you can definitely dial things in.

Sucks about your Onkyo, I haven't heard anything good about their reliability for a while...
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post #37 of 50 Old 06-16-2012, 09:51 PM - Thread Starter
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Thats EXCELLENT news! Save's me the headache of buying more equipment that I'll only possibly use once and have to store somewhere until the next upgrade. I'm really thinking about buying another pair of drivers off Amazon so I can run a total of four in room, except they have a purchase limit of three max.

It really does suck... I was excited about upgrading from a older Denon unit 1.5 years ago, now I'm coming to the conclusion that Onkyo isn't what it used to be.

I'm still trying to track down a Beringer for cheap. I'm keeping my eyes peeled for something used in hopes I can get a deal.

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Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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post #38 of 50 Old 06-16-2012, 10:48 PM
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You first want to run the headphone output into the mic input to calibrate it so its measures flat. After that you plug the Audyssey mic into the mic input and the headphone output connects to your receiver. notnyt compared various mics including the Audyssey mic and it works fine for sub measuring.

http://www.avsforum.com/t/1328136/measurement-mic-shootout-emm-6-wm-61a-rs-33-2055-audyssey/0_100

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post #39 of 50 Old 06-16-2012, 11:43 PM - Thread Starter
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MrKazador, thanks for the help! This sounds like a simple solution that will get me a rough idea of whats going on. I don't think I'm quite ready to start purchasing a surplus of equipment that won't get much use.

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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HDMI Set Top Box
Belkin PF60
1 Yamaha NS-C444
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post #40 of 50 Old 06-20-2012, 05:58 AM - Thread Starter
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Picked up a used EP2500 on Ebay, MiniDSP is in the mail, Subs arrived, and I'll soon be building the cabinets. So far it's looking like 23"x23"X32"x32" with an internal volume of 6.9, internally braced, with 21.5" on square port tuned to 17.8hz.

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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HDMI Set Top Box
Belkin PF60
1 Yamaha NS-C444
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post #41 of 50 Old 06-20-2012, 07:24 AM
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Nice. What are the rest of the port dimensions? Just make sure you set a 4th order HPF at 17hz.
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post #42 of 50 Old 06-21-2012, 02:10 AM - Thread Starter
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Port should be 21.5"x 29.25"x2"

Any suggestions on where to get some quality materials?

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
PS3/Xbox360
HDMI Set Top Box
Belkin PF60
1 Yamaha NS-C444
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post #43 of 50 Old 06-21-2012, 06:57 AM
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Lowes and HD sell 3/4" MDF. I've also had good luck with the 3/4" AC Fir ply. Do not but any of the ply with a thin veneer for an outer layer.

I'm showing a port with those dimensions tunes you to 22hz in 6.9 ft3. In order to get 18hz it would have to be 46" long, 20hz would be 36" long. 22hz looks like a very strong sub, so dont feel the need to change it.
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post #44 of 50 Old 06-27-2012, 07:50 PM - Thread Starter
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Ok guys, I'm a little stuck with the MIniDSP. I'm trying to set the basic crossover up, and just making sure I understand the setup. I found this article and have decided to mimic it to get my setup dialed in.

http://www.hifizine.com/2010/09/subwoofer-equalization-and-integration-with-the-minidsp-2x4/

As of now I'm just playing around with the MiniDSP, I don't have cabinets built for the drivers yet since I'm waiting on my shop to be built in the back yard.


I know I should be setting a HPF, but where? LOL

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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post #45 of 50 Old 06-27-2012, 09:13 PM
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uhh under crossover.
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post #46 of 50 Old 06-27-2012, 10:57 PM
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HPF should be right around the box tuning point. Most will put it 1-2hz under the tuning point, or right at the tuning point.
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post #47 of 50 Old 06-27-2012, 11:23 PM - Thread Starter
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Thanks for the help Cookie, made a world of difference!

Jay, from what you're saying I should put the HPF at 18hz or so, then what should the LPF be set at?

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
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post #48 of 50 Old 06-27-2012, 11:59 PM
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Quote:
Originally Posted by Big-Sexy907 View Post

Thanks for the help Cookie, made a world of difference!
Jay, from what you're saying I should put the HPF at 18hz or so, then what should the LPF be set at?

was that sarcastic ? LPF should be where ever your going to cross with your mains 80 should be the right place for ht
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post #49 of 50 Old 07-02-2012, 10:16 PM - Thread Starter
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Well, I bit the bullet and picked up another pair of subwoofers from Amazon, looks like I'll be going with four Mofo's and two ep2500's I found another ep2500 for cheap and I couldn't pass up the offer.

If anything it'll give me something to add to the shop if it's "Too Much". eek.gif

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
PS3/Xbox360
HDMI Set Top Box
Belkin PF60
1 Yamaha NS-C444
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post #50 of 50 Old 07-04-2012, 01:03 AM - Thread Starter
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I just had a thought, I'll prolly need my electrician out to run another circuit to the room. I'm thinking I may be stressing the current setup if I'm running two EP2500's.

Panasonic TC P65s2
Onkyo TX-NR708
2 Beheringer EP2500's
4 Power Acoustik Mofo 15's (6.9 Cubes tuned to 18Hz). Cabinets still need to be built.
PS3/Xbox360
HDMI Set Top Box
Belkin PF60
1 Yamaha NS-C444
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