imp rise

ok just tryen to get my imp rise down on a curent build, i know that i will have to build anther box but what i would like to know is how can i caculat imp rise before i start anther build is there a formula that i can use to get my imp rise on a desgine of a box and then just play with the numbers till i get it where i want it ? thanks for any inpute

test the ac volts out.. and ac amps out. multiply for your power output. divide for the impedance rise.. divide your ac voltage by the ac amps you tested

I think he was asking if there was a formula like the one you would use for calculating port length for calculating potential impedance rise. The answer is no. It's trial and error. To help reduce rise you need to sturdy your box. Fiberglass resin and bracing can be a big help with this. Also, rolling your volume up on a burp instead of full blast right off the bat helps reduce the rise initially so you get a higher response before your rise goes up. I can't remember which way it works with enclosure volume. If I recall right, the smaller the box the lower the rise but it could be the other way around.

no rolling the volume allows the rise to occur so your amps stay on when running a lower loads.

bruce-bruce wrote:

no rolling the volume allows the rise to occur so your amps stay on when running a lower loads.

Really? odd, i gain 1-1 1/2 DB rolling over just burping and my amp dosn't clip or anything.

It's due to less voltage drop.

Ahh thanks Nate