[tremrej65]

Doing measurement using REW is very helpful to figure out what all these controls do. That's what I did to integrate the OB Double Trouble sub with the X-LS Encore. And I use a high pass filter of 70 Hz on the X-LS Encore (using cap between pre-amp and amp). I'm getting decent pressure (around 95 dB) in my small room (11x15 feet) with a single sub. I found that setting the low pass at 50Hz24 gives the steepest slope. That's what I use. The end result is amazing.

[tomlinmgt]

Not sure if this is helpful, but it's all I got...

Yes, I have studied that. Which is why I'm trying to get more info...it just left me with more questions. Lol. Thanks just the same for sharing.

[tomlinmgt]

Doing measurement using REW is very helpful to figure out what all these controls do. That's what I did to integrate the OB Double Trouble sub with the X-LS Encore. And I use a high pass filter of 70 Hz on the X-LS Encore (using cap between pre-amp and amp). I'm getting decent pressure (around 95 dB) in my small room (11x15 feet) with a single sub. I found that setting the low pass at 50Hz24 gives the steepest slope. That's what I use. The end result is amazing.

I have and use REW, but using it to figure out what each of those plate amp filter settings does sounds rather tedious...not to mention how the room acoustics would create a variety of results for each setting based on the position of the sub array(s) which would only add to the tedium. Unfortunately, I simply don't have that kind of free time right now.

So why use an inline filter to the mains rather than using the output on the plate amp to the main amp and crossover set to 70 Hz?   When using the inline filter, what sort of slope does that create after the roll off at 70 Hz? Because if you're rolling off the mains at 70 Hz and the subs at 50 Hz with a fourth order slope, is the 20 Hz delta not too big a gap to bridge without having a dip in the frequency/amplitude curve?

[tremrej65]

So why use an inline filter to the mains rather than using the output on the plate amp to the main amp and crossover set to 70 Hz?   When using the inline filter, what sort of slope does that create after the roll off at 70 Hz? Because if you're rolling off the mains at 70 Hz and the subs at 50 Hz with a fourth order slope, is the 20 Hz delta not too big a gap to bridge without having a dip in the frequency/amplitude curve?

Good question. I don't think you can change the high pass filter on the plate amp: it is fixed at 80 Hz. But I would not trust that. I don't use it.
In my case, the high pass filter gives me - 3 dB at 70 Hz. And the X-LS Encore drop down naturally lower than that. So it is fine for me. In my case, the usage of the high pass filter it to avoid overloading the X-LS Encore with deep bass.
As a reference, here's what I'm getting: The sub, the X-LS Encore with high pass filter, and both together.

[Danny Richie]

So why use an inline filter to the mains rather than using the output on the plate amp to the main amp and crossover set to 70 Hz?

Never use the high pass filter on any plate amp. It is just going to place an electrolytic cap into the signal path.