Originally Posted by Darin
Really? That is extremely
odd for a commercial ported sub. If that's the case, I'm surprised there aren't more complaints of bottoming.
EDIT: after looking at the manual for this sub, it does mention a switch to be used in conjunction with removing or replacing the port plug... this most likely would be affecting a high pass filter. So the first thing I would check would be to make sure the switch setting matches whether or not you have the port plug installed. If you aren't using the port plug, you'd want to make sure you have it set to "max output mode". I don't have this sub, but I would guess that this switch would result in raising the HP filter to something appropriate for the higher tune that would result with no port plug installed. The driver will easily bottom out at frequencies below tune. Removing the port plug raises the tune, so the HP filter should shift upwards to protect from bottoming at those frequencies.
You're exactly right Darin. I'm not sure how this myth got spread that our products do not use HP filters, even though we've been using them for years and have advocated using them on ported subwoofers.
. Frankly, it wouldn't be very prudent on our part to do that.
Good advice too. I do not
recommend running the subwoofer in extended bass mode set on the amp, with no port plugs (and no turbo) installed. This could damage the subwoofer, because the woofer would have very little protection as it unloads below port tuning. On the other hand, it's perfectly ok to run the subwoofer in maximum output mode set on the amp, with or without a port plug or turbo installed.
Assuming it is not the case where the subwoofer is being run in extended bass mode set on the amp with both ports open...definitely it would be worthwhile to do some calibration to verify that the subwoofer is not being run very hot relative to the other speakers. Also, if one has a large room, they can maximize impact by using nearfield placement. Let us know how it goes, Irvin.