Adding Sub to current system


I currently have a pair of Sonus Faber Electa speakers. These speakers have 6" and 1" drivers respectively and have a 1st order crossover. The popular magazine test disk demonstrate the speakers go down to about 40HZ. I'm interested in what I'm missing below 40HZ besides just a non-musical "BOOM". I know for a price musical Sub's are available, but would it be an exercise in futility trying to integrate a Sub into my system? The spot I would choose for it would be to the left of my speakers in a corner - your thoughts please!
Rpg
rpg
Rpg - If you go with Rel, depending upon which model you prefer, you might have to stretch your budget a bit. I can tell you that my Rel R-305 is a fantastic match for my Sonus Faber Guarneri Mementos. Someone has an R-305 for sale right now on the 'Gon and the asking price is ~ $150 above your approximate budget limit. I do not know the seller nor do I have any connection to the item for sale.
I have recently experimented with bringing my sub from a dedicated home threater into my two channel system (consisting of paradigm signature 2's). I immediately loved the additional bottom end as the sub really filled out the presentation and created a much more enveloping sound. However, I still don't feel that I've got the placement, crossover, and phase perfect. Honestly i don't know if I ever will. Rather that spending the bucks on a sub more suited to music and my monitors(was thinking about the paradigm sub 1 but that a big chunk of change) and trying to get it perfectly integrated, I'm now just going to upgrade to a floorstanding speaker that can play close to full range.
SB
Hi Rpg,
it might sound silly, but I look at Craigslist everyday. Occasionally I see some incredible buys. Also,
HSU has some very decent woofers. One brand new 15 that will cost around $1000.00 delivered. The Rel's are really quite good, but I'm a believer that with some trial and error that you will get a good experience with several different woofers if you do your homework and take your time with setup.
I scored a REL Q150E on ebay for $200 last year...all it needed was new grill cloth...and it works perfectly. If you can't dial in a proper sound by moving it around, adjusting phase, level, and crossover points I'd be surprised. Also note that although I leave mine alone a lot, sometimes I need to adjust the level a little...so I stuck a "chicken head" knob on it so I can tell where the knob is by feel without moving it.
Rpg writes:
>I currently have a pair of Sonus Faber Electa speakers. These speakers have 6" and 1" drivers respectively and have a 1st order crossover. The popular magazine test disk demonstrate the speakers go down to about 40HZ.

A 6" driver can only provide clean output on acoustic music at subjectively realistic levels down to about 120Hz.

If you don't want your mid-range mucked up from IM distortion and fuzzy bass, you need to remove the high frequencies from the driver which means an electrical high-pass filter on the main speakers.

That rules out the RELs where the main speaker signal is unmodified and sub-woofer low-pass set to where they meet.