Subwoofers and Crossovers.

@artemus_5 , I did think of getting two E110s instead of two D110s + CR-1. The E110 options is much cheaper. I might be completely wrong in this, but I preferred the second option thinking that the crossover in CR-1 will be much better and I didn't want to run long line level connection to and from the subs.

Thanks for nudging me to rethink that option. 

sorry to put a damper on your plans but i have the spendor d7.2 and previously the d7.  

tried to integrate 3 different set of subs, ML, JL audio and REL.  

you are on the right track trying to high pass the main speakers, the spendor's deep bass goes down to 25 hz in my room and trying to integrate theresigned  usual way never sounded right.  

the problem is that the spendors are so fast and dynamic, i always felt the subs were out of sync and holding the timing hostage.

after optimizing the placement of the spendors for bass response (try an audio note style corner loading, not too close, maybe 2 feet) and much experimentation, as well as an amplifier with sufficient bass power and control (pass labs) i decided the system was perfect without subwoofers.  

the d7.2 are very special speakers, fast and dynamic with deep bass due to the long flared port.  proceed with caution and see if they can't satisfy on their own.  

@avanti1960 While adding the subs did you high pass your mains or did you run them full range?

I am actually very happy with my setup.. but as is the case in this hobby one always wonders if things can be improved. Hence I am looking  at adding subs/crossovers.

In my room(fairly large) the system starts to roll off below 50Hz and there is nothing left by around 30Hz. Maybe I should look at my speaker placement more critically.

I am using a JL CR-1 crossover along with 4- JL F-113 subs. I have my speakers about 8 feet out from the back wall. This allows some very open soundstage albeit at a loss of the low bass that usually comes with closer rear wall reinforcement.

Adding the subs to crossover at about 55hz. brings back that low bass that is missing.

It also frees up the main speakers to sound there best.

ozzy

@dimbhaka  @kenjit 

To low Pass Filter or NOT to Low Pass Filter. That is the question. I am a Rel fan and have had them for 20 yrs. Here is their take on the Low Pass Filter. Make what you will of their position

Low Pass Filter?