Subs with room correction DSP?

I bought a 15’’ sub from paradigm, the most affordable line and it had ARC built in. If I remember correctly it had me use my tablet mic and took measurements from several specific spots in the room.

I should also point out, the AM Acoustics room mode simulator is a great tool for finding the initial placements for subs, speakers and listening locations.  Try to keep all three away from the lowest room mode locations.

After that, I'd keep your Hsu and add a miniDSP rather than buy anyone's room correction, assuming you already have the measurement capabilities. It's going to be a lot cheaper.

Another tip:  If your main speakers are ported, plug them. It makes integration easier, and reduces main speaker distortion and improves it's dynamic range.

After that is all done, integrate the slopes and delay.

Next, clip any narrow bass peaks before setting the sub level. 

Set your sub to descend from it's lowest viable frequency, about 1.25 to 1.5 or 2 db/octave.  OK, now set the sub level by ear.

I have been pleasantly surprised with the ease of setup of my Perlisten subs.  The DSP was so easy to setup I thought I must be doing something wrong.  There are several subs that use in-room feedback and re-calculate output in realtime.  They state that it recalculates 1000 times per second.  They are not cheap but will go toe-to-toe with JL.  

If you want microphone based setup, Velodyne supports this.  There is a new distributor for Velodyne and you ought to reach out to them directly to get details. 

Full Disclosure - I am a current Perlisten retailer and former Veloydyne regional distributor so I am familiar with both products.  

@traudio , take a deep breath and let it out. You are on the right path. The only error I see in your approach is that you have to include your main speakers in the mix. The issues with subwoofer integration are the right two way crossover point and slope, phase and time matching with the main speakers and finally what most people call room control which is really speaker control. 

For most systems the right TWO WAY crossover point is going to be between 80 and 100 Hz. This is NOT just a low pass filter on the subwoofer but a corresponding high pass filter on the main speakers. Trying to integrate subwoofers with just a low pass filter is ....fill in the blank. Relieving the main speakers of having to make low bass lowers distortion through the lower midrange and increases headroom.  Through the crossover region the subwoofer has to be in phase with the main speakers and the sound from the main speakers has to reach your ears at exactly the same time as that from the subwoofers. If this is not the case you wind up with the sonic equivalent of mud. Phase is cyclic so you can be in phase but out of time. You have to be both in phase and time for the best performance. Room control is equalization to fill in room nodes evening out the frequency response at the listening position. The only way all three issues can be fulfilled is via digital bass management. The best way to accomplish this is with a digital processing preamplifier. These range from the very respectical MiniDSP SHD at $1500 with the best microphone to the $12,000 Trinnov Amethyst. My personal favorite is the DEQX Pre 8 which is going to be released shortly, price yet to be determined. There is also the Anthem STR at $4500. 

Two subwoofers are mandatory. Do not even bother with one. Without two subwoofers and digital bass management with room control most people will be better of without subwoofers.

mijostyn
Thanks for the advice but 2 things: 
1: My speakers claimed frequency response is 25Hz-30kHz but I see a drop off in the bass around 35Hz so the subs are just filling in the very bottom.  
2: I use an integrated amp, so I'm not able to use this pre-amp you are recommending. 
That being said, I don't see the need to roll the main speakers off if they aren't struggling to provide most of the bass. 
If I had some small monitors, then yes, I would agree that rolling off the main speakers would be a good idea.