REL Classic 98

I have reached out to REL, @gdaddy1 . No doubt stacked S/550s would sound better than 2 T/9xs on the floor, and they would take up less floor space.  So, perhaps that is where i will end up. The monoblocks are scheduled to arrive on Tuesday, so i can start experimenting with the single T/9x then and decide whether that sound is unacceptable.

thanks, again.

T9X to a pair of Classic 98 would absolutely be a downgrade.  That's not the right move.  Get another T9X.  Classic 98 takes up about the same amount of room and is if anything more visually intrusive.  It's a cool sub if you want that look, but the T9X is far far better.

Thank you, @simplystereo . That is highly responsive and valuable.  

@gdaddy1  Two stacks needed, or does one suffice?

@hickamore  Since its non-directional one stack works just fine. I took RELs advice and started in a corner location. I ended up about 30" out from the corner along a side wall. Bass sounds like it's coming out of the middle of the sound stage image.

It's important to note that in order for this to work properly both subs should be the same make and model. Prefer high level inputs for dynamics and easy linking them together. For music I much prefer a sealed box. They should be stacked as close together as possible. With feet removed and a thin layer of drawer  liner so they don't move. The concept is to 'couple' them together as one unit. Takes two single subs and turns them into one super sub.

Again, this is NOT about making them louder. There's a misconception that it will be so loud it will over power the room. Your comfortable bass level is what you set it at. This is about effieciency through physics and taking the stress off the speaker.

When my subs were set in stereo the gain control knob was set at around 1:00 once they were stacked  the boost in gain of 6db required the knob be turned DOWN to around 10;00. I couldn't believe it!

Low level listening is also improved. When the music is turned down there's still a pleasing 'thump' to the music.

The movement of the cone will be LESS. The voice coil will operate closer to it's center point where it's most effiecent with less distortion. (the longer the throw the more distortion.) The bass will be more effortless, cleaner and well defined because it's not working as hard. Same goes for the amp. The availablity to now adjust the crossover differently on each sub improved the entire bass spectrum.

It took a total of a half hour to stack them as an experiment and cost nothing. If you don't like it just put them back. This simple experiment yielded the biggest improvement in sound I've ever done.