Originally Posted by bsoko2
Played around with the system and the Empires seem to have made the bass higher and not lower due to sealed and ported mixed. Just my own personal taste liking the ported bass sound over sealed. Funny, becuase I had the same situation with dual Ed A7S-450's. I thought that the Empires would be diff due to all the hype. Now I really know that sealed is not for me. So I will probably at some point be selling the Empires. Any one out there have sucess mixing a Conquest with the Empire(s)?
Your issues are likely not related to sealed and ported mixed together. They are likely related to the fact that the Empires don't have as deep extension as the Conquest. When calibrating all the subs *together*, the level of the each sub, (including the Conquest), is decreased. Since the Conquest is the only sub producing the infrasonics, the infrasonics are decreased relative to the rest of the bandwidth accordingly. This is always a problem when trying to integrate multiple subs with different extension capabilities. This is also likely the issue you were having with trying to mate the MFW-15 with the Conquest.
Before you throw in the towel on the Empires, let me suggest a different alignment for them. Since the Conquest is a "bottom dweller", stick it in the corner and use it as an "infra-sub". Set it up with a crossover so it is only reproducing the lowest couple of octaves. According to Tom Nousaine, it has good output (104 dB) to 12 Hz: http://epiksubwoofers.com/C2.pdf
(That 104 dB was measured in the middle of a large room. Move it to the corner and you could expect about 6 dB more output across the board.)
The Empire's claim to fame, according to the Epik website, is mid-bass slam, so use them for that:
Even when compared to a separate midbass module, it still has more overall output capability. In fact, it has more overall midbass output than any other subwoofer we have ever offered.
Therefore, use the Empires as mid-bass modules. Set them up with a crossover eliminating the lowest bass, (which will be reproduced by the Conquest.) Then, place them around the room were they interact best in the modal region, (up to about 80 to 120 Hz). You should be able to reduce the modal peaks and nulls over a large listening position with 2 Empires and good placement. If your room is a rectangle, dual, mid side-wall or mid front/rear wall placements should be the best for modal flattening. If your room is not rectangular, you'll need to experiment with different placements to find the best locations, but you should be able to get much flatter response through the mid-bass bandwidth with 2 properly placed subs.
This type of system requires a crossover between the infra-sub and the MBM's, but dividing the frequency spectrum into the 2 bands can increase headroom for each portion of the spectrum. IOW, each sub, (or sub pair), should be able to reproduce it's assigned portion of the audio spectrum louder and with less didtortion by eliminating the other portion of the spectrum.
A Behringer DCX2496 crossover can be used to do all the crossovers, delays/phase alignments, level settings and EQ: http://www.behringer.com/EN/Products/DCX2496.aspx
You could set a crossover in the Behringer of 30 to 40 Hz, and send the deep stuff to the Conquest and the mid-bass to the Empires. Since the Conquest is ported, it will likely have some "group delay" that the Empires don't have, so the Behringer will be needed to set some delay on the Empires to compensate. Finally you can level-match all 3 subs and set EQ filters with the Behringer. You may no longer be able to use your Audyssey SubEQ, but it would be replaced by the Behringer unit. You would have a terrific *system*.
IMO, this would be a much better way to integrate the Empires into a system with a Conquest. It takes advantage of each of their strengths while eliminating the issues with trying to use them both "full band".