Quote Originally Posted by the hand of boredom
Hey Guys,

Great to be back after way too long a time away. Been busy with school taking courses in chemistry, physics and calculus. These courses (actually, the work required to get good grades) has kept me away from the listening room.
Welcome back, looks like the hand wasn't all that bored!!! LOL

I have a question for anyone that can anwer. In a basement listening enviroment, that is, carpet on top of concrete, painted drywall, vaulted ceiling, is there much absorption of the 'slam' frequencies from subwoofers?
The drywall usually will resonate a bit, and that usually provides for some absorption. If the ceiling is pretty high, it will lower the tone of the room resonance(floor to ceiling reflections). Providing the deminisions of the room would help alot.

Here's what I've noticed: my Mirage SS1500 (active 10 inch driver, passive 10 inch driver, and a 1 square foot enclosure) has better punch in a 9000 ft^3 space on the main floor and my 2 Servo 15s in a 4000 ft^3 basement. It doesn't make sense to me.

I did a SPL reading in the summer. I got readings of +30 db in the range of 30 hz to 37 hz. I had the subs running from the SUB out of the receiver. Now I run the MAIN PREOUT of the receiver to the X30 crossover which one signal to the Anthem amp and another to the subs. Haven't taken any readings since.

The house literally shook when watched Gothika, probably a result of the peak mentioned above. When I play some Dr. Dre, or Madonna, the music is kind of lifeless. The truly deep deep bass is there, but no punch or energy.

Is this a result of the absorption rate of the basement? a phase issue?
I think you have answered you own question. If you have a very elevated deep bass response, it will make it seem like the mid and upper bass has the life sucked out of it. The slam in drum kick's is in the 60-100hz region.


I'm in the process of finding a good rate for the Rane PE17 parametric EQ. Would one suffice, or would I get better performance from the subs by tuning each one separately?
Thanks for reading this folks, I always appreciate your input.

THOB
Unless they are going to be side by side, or on top of each other, I would eq them seperately. If you placed two subs in opposite corners, they are very likely going to have a different frequency response. That is because each loads the room differently because of their different location. The object is to get them both to sound and measure VERY closely, if not indentically.