The drivers I have are the TD15S. Specs as follows. I want to run them from 60-70Hz up to 300-320Hz. I want to run a pair a side. Is this only practical in a U frame if I have them vertically stacked or can they be horizontally stacked? How do I know what difference this will make? Should the U frames be separate for each driver? How will I know in advance what response I can achieve? Also, how do I know whether the drivers themselves are suitable for a U frame? How do I know the size of the U frame?

I figure there are a lot more questions I need to ask but this is it in a nutshell. Many thanks in advance for advice.

TD15S- 8ohm

Fs 22.8 Hz

Qms 3.87

Qes 0.41

Qts 0.37

Vas 467 Liters

Cms 0.45 mm/N

Mms 108 grams

Sd 855 cm2

Rms 4.0 Kg/S

Bl 14.1 T/m

Re 5.3 ohms

Z 8 ohms

Le 0.3 mH

Pe (max) 500 Watts

Pe (transient) 1000 Watts

"no" 1.31 %

1WSpl 93.4 dB

Linear Xmax 14 mm (peak)

Mech Xsus 20 mm (peak)