Axiom Home Page Forums General Discussion Technical Questions Using Two Subs

I hate to hijack this thread, but I'm receiving my second sub today , an EP500 to go along with my EP350. I don't have a SPL meter, but I do have EZset/EQ I can use on my HK 247.

My question is, how would I use that in a two sub calibration? Do I need to have both subs on and set to about 9 o'clock on both of the dials? Or does one need to be set a little more "hot" then the other before hitting the calibrate button?

I think it will be a little difficult to get them both dialed in using an autosetup method. I calibrate each of my subs seperately with the other shut off with my Radio Shack meter, then turn them all on.

If both subs were the same then I think the autocalibration would be close, as the 2 subs are different, it may have a hard time setting them. I would be shopping around for an SPL meter, they are not expensive and an indispensible tool for an HT enthusiast.

Also, if the subs are near each other it would be better, but if you have them across the room from each other, I don't think it will calibrate well.

Thanks for the advice, I'll go to ratshack and pick up a meter. Both of the subs will be located on my front wall about 10 ft from each other. Thank you for the help guys!

Besides, an spl meter is a critical tool in the audiophile world. You can't be a jedi withouth the light sabre!

Your falling granny avatar kills me every time I see it. Is that what the jedi call collateral dammage?

Lol!! Thanks! There's another one I've seen where Obi-Wan is force pushing some goats. It's pretty hilarious!

Sure, it's good to get the SPL meter, but even with different subs well-separated it's possible to auto-calibrate with one sub at a time working, then afterwards reduce each sub by 3dB on the receiver sub trim setting so that the overall balance will be the same with both working.

Ok, I did some rearranging in my basement on my subs (EP350 and EP500). I first put them two on the front wall under my projection screen.

I don't have a radio shack spl meter yet because the one here in my town don't have one. So I'm going to have to wait a little bit before I get one.

Anyways, it sounded to my ear good, but not spectacular, after doing numerous eq'ing with my HK ez setup. So I watched the video that Ian provided and decided to set both of my subs on adjacent side walls in my basement, like what Ian suggested. I did the automatic setup from my receiver to get the right db levels from all of my speakers then I manually set my crossover points to what sounds good to me. (80hz on center, surround and back surround. 60hz on my mains)It sounds 10 times better now.

Now onto my question. My EP500 was doing fine for a couple of weeks in it's new position. Then lately( it started last friday ), at certain frequencies, there will be a slight vibration coming from it. I put my ear up to the sub, but I can't tell if it's coming from the driver, or within the cabinet. I don't have any kids or any animals, so I don't think anything got into the port. Any help would be appreciated! Thank you!

Ascension - first things first, you need to update your signature now that the 500 is in.

On the vibration, sometimes wires come loose inside near the driver. If they hang close to the woofer, they can vibrate when the woofer moves and cause sounds like you are hearing.

If it's bothering you enough that you feel like removing the woofer, it's fairly easy to check to see where the wires are hanging.

Jason