Musicians Roadhouse

This thread is open to anyone really.
I'm sure most of you are familiar with the way old school valve amps reach a certain point on the MV or volume dial where you get controlled feedback and warms up tonewise with the notes sustaining into feedback. I don't know what the technical term is for this.
Anyway, with my 2266 and 1960b 300w 8 ohm cab the sweet spot came on at 7 on the MV. But since I changed to my 1960BHW 120w 16 ohm cab it doesn't seem to reach this spot.
The G12h's sound much better but I can't seem to get the same effect anymore.

I wondered if the different ohm setting affects how the amp behaves, or maybe I've got to crank it much louder.

Any ideas?

Not the ohms, it is the frequencies coming from your new speakers and interacting with your guitars pickups that is different now which might require more power to get that harmonic feedback to start. If you find your self having to turn up the amp much louder now there are a couple of things you can try.

Try a OD pedal in front of the amp as it will make the feedback start at lower volumes but also may change the tone also.

Change the guitars pickups to something hotter.

Thanks Surf,
Yes I hadn't thought of that. Well I use a TS9 already to push the front end. As far as pickups go they are 9k SD78, I'm reluctant to go hotter as Ive found for me the tone suffers and things don't clean up so well on the volume pot with high power pickups.
Maybe I'll have to try upping the body and detail and maybe raising the pickup.

As Surf said(more or less) I think it's a frequencie thing..
The new speakers cuts/got a dip were you before had the feedback comin..

As you said it sounds better, that should also be sound different right?