Quote Originally Posted by GM View Post
Around 35Hz IIRC.

Well, if it needs a higher tuning, then the port must either be bigger or the cab's net volume [Vb] must be reduced; lower just reduce the port opening and if you want to lower it a lot [like down to Fs], then make a rectangular duct of 'x' length with a small flange to slide it into the port with a little gasket or similar to seal it.

GM
I was thinking the same on the method to possibly tune them lower GM.
Thanks. I'll measure them as is and let you guys know in another post.

My ears tell me they are a tad boomy and don't go as low as I "think" they should.

Of course the subs fix the low end. But this is just something I will enjoy investigating.

I should probably measure the output impedance of my tube amps as well.

Ron