Looking for new bookshelves, but I need help ...

[SQBubble]

Ok, heres the deal...

I love the B&Ws, but, sometime when I feel like listening to some loud music, it doesnt get loud enough, and the midbass doesnt hit you in the chest enough, not that it doesnt, I just got that little need of wanting more dbs of midbass and instrument that perce through your chest, yet sharp and detailed, I may sound , but I just love loud detailed music. So here I am wanting a new DIY bookshelves setup that will replace the B&W 685.

Im pretty much settled on the woofers and tweeter though, each bookshelfs will consist;

woofers: 2 SDX7 ported in 1cu.ft @35hz/3"port playing from around 30-40hz to 1800-2000hz
tweeter: Morel's Elite tweeter 338 playing from 1800hz-2000hz to the top...

My goals:
Real High-Output bookshelves.
Sharp mid-bass and detailed sound all over the frequency range (down to 50hz) even at high output.
Warm, healthy, clear, dynamic and solid sound(controlled) for trance and dance music(no muddiness at all) even at high output

Now, I read that the sdx7's midrange isnt all that good, idk if its really true or if its true but isnt really noticeable.

Now, my few questions are:

1. Will 2 SDX7 in 1cu.ft @35hz will give me some loud snappy mid-bass ?

2. Will 2 SDX7 with the Morel's ET338 blend well with each other ?

3. Can I use some EQ to solve the midrange dip known around 800hz from some reviews I read?

4. Considering that the sdx7 is an 8ohm drive as well as the morel et338, I will have 3 8ohm drivers so that would make a final impendance of 2.67ohm... Should I worry about that?

5. If I make these bookshelves, I will need a xover, obviously, but I read alot that the pre-built PE's xover arent good, also, they are 300w max power, why's that? I will be giving around ±400-500rms to each bookshelves so if the 300w max power is really true, then I will have to make a custom xover, would someone help me plan a crossover ?

6. Finally, should I bother considering a mid-range dedicated driver?

[BoomieMCT]

SQBubble wrote:

Ok, heres the deal...
4. Considering that the sdx7 is an 8ohm drive as well as the morel et338, I will have 3 8ohm drivers so that would make a final impendance of 2.67ohm... Should I worry about that?

5. If I make these bookshelves, I will need a xover, obviously, but I read alot that the pre-built PE's xover arent good, also, they are 300w max power, why's that? I will be giving around ±400-500rms to each bookshelves so if the 300w max power is really true, then I will have to make a custom xover, would someone help me plan a crossover ?

4. First off, what will your amp drive - 8 or 4 ohms? Since you will have a crossover the total impedence will not be all three elements in parallel. You will have roughly either 16 or 4 ohms for the woofer segment and 8 for the tweeter. You have to realize the impedence of a driver isn't flat over all frequencies and that adding a crossover has a huge affect as well. I highly recommend reading a bit more about crossover design and getting Passive Crossover Designer (free) from the FRD Consortium and playing with it for a while.

5. Pre-built crossovers rarely measure flat once hooked up. Some consideration for what drivers you are using and what enclosure they are in needs to be made - especially since you are looking to buy some decent (not cheap) drivers.

[SQBubble]

BoomieMCT wrote:

4. First off, what will your amp drive - 8 or 4 ohms? Since you will have a crossover the total impedence will not be all three elements in parallel. You will have roughly either 16 or 4 ohms for the woofer segment and 8 for the tweeter. You have to realize the impedence of a driver isn't flat over all frequencies and that adding a crossover has a huge affect as well. I highly recommend reading a bit more about crossover design and getting Passive Crossover Designer (free) from the FRD Consortium and playing with it for a while.

5. Pre-built crossovers rarely measure flat once hooked up. Some consideration for what drivers you are using and what enclosure they are in needs to be made - especially since you are looking to buy some decent (not cheap) drivers.

thanks for the reply,
My amp(crown xti1000) will drive from 2ohm to 8ohm, 275rms @8ohm, 500rms @4ohm and 700rms @2ohm. I'm thinking of getting another amplifier so I could run an active setup so I wont bother with crossovers, hence a lot more simple/less headache... But then again a good crossover might save me some money ... But I have read some stuff about crossovers, and it really doesnt seem simple....
And pre-built crossover is out of the question now!!!

Anyone have some answers about the other questions?

thx again