Multiple Subs- do they need to match?

[Nasir]

I have checked out a lot of sites regarding subwooofer placement and the preference of 2 smaller subs over a single large growling variety of these beasts!
In theory and for the sake of symmetry, the left speaker and right speaker sides should be mirror images so as not to introduce MORE errors, leaving us with placement techniques and the dreaded room treatments to try to tame the other anomalies. The 2 subs in this case have to be placed so as NOT to reinforce but to minimize the standing wave patterns, otherwise a heavy bass headache will result.
Most cone speakers bow out around the 60 Hz mark, leaving the sub to fill in the rest. Electrostatic and other panel speakers hand over the heavy work to the sub at around 100 Hz. I am generalizing here, so please don´t get upset if your speakers cross over to the sub at different frequencies!! The 100 Hz wave can be localized as to be coming from 1 sub wherever it is placed breaking the effect desperately desired by our lot. Hence, the use of 2 subs removes this localizing annoyance.
So much for rules, but I am married, and the only rules that apply at home are made up by the wife and cats! To start with, nothing is symmetrical in my speaker placement and the recommended speaker to wall distances have been ignored in favor of me sleeping in the matrimonial bed instead of on the sofa. I have Electrostatic speakers, so the need for a second sub became evident quite early on. I am using a 2nd sub that is a lot different from the Final Sound sub that came with my 300i panels. Obviously, it took much longer to set up and the test tones easily distinguish the better sub, but for music and movies I am rewarded with a more enveloping bass than with a single sub setup.
Hope to have been of help.....

[Sir Terrence the Terrible]

I have checked out a lot of sites regarding subwooofer placement and the preference of 2 smaller subs over a single large growling variety of these beasts!
In theory and for the sake of symmetry, the left speaker and right speaker sides should be mirror images so as not to introduce MORE errors, leaving us with placement techniques and the dreaded room treatments to try to tame the other anomalies. The 2 subs in this case have to be placed so as NOT to reinforce but to minimize the standing wave patterns, otherwise a heavy bass headache will result.

The problem with this theory is that it requires a sub to be placed in the center of the room, suspended equally in between the floor and ceiling not touching any surface. I do not know many that would be comfortable with that set up. We have not even mentioned the complete lack of low frequency support that set up would have.

Most cone speakers bow out around the 60 Hz mark, leaving the sub to fill in the rest. Electrostatic and other panel speakers hand over the heavy work to the sub at around 100 Hz. I am generalizing here, so please don´t get upset if your speakers cross over to the sub at different frequencies!! The 100 Hz wave can be localized as to be coming from 1 sub wherever it is placed breaking the effect desperately desired by our lot. Hence, the use of 2 subs removes this localizing annoyance.

Two subs crossed over at 100hz would not exactly localize at exact locations, but you sure would know if they were both located at the front of the room, or in the rear of the room. If you split them up into front and back placement, you sure would know exactly where they sound is coming from. 80hz and below is a safer bet for both saving the smaller main speaker, and for not giving away the subs location.

So much for rules, but I am married, and the only rules that apply at home are made up by the wife and cats! To start with, nothing is symmetrical in my speaker placement and the recommended speaker to wall distances have been ignored in favor of me sleeping in the matrimonial bed instead of on the sofa. I have Electrostatic speakers, so the need for a second sub became evident quite early on. I am using a 2nd sub that is a lot different from the Final Sound sub that came with my 300i panels. Obviously, it took much longer to set up and the test tones easily distinguish the better sub, but for music and movies I am rewarded with a more enveloping bass than with a single sub setup.
Hope to have been of help.....

On one hand it is great to be married, on the other not if you are a video or audiophile.

[E-Stat]

So much for rules, but I am married, and the only rules that apply at home are made up by the wife and cats!

Fortunately, I was able to train mine from day one. She moved into the house I had purchased while still a bachelor with the system in place. E-Stat's low-WAF environment circa late 1985:



That tapestry draped over the stair rail behind the couch became my first room treatment when I hung it on the back wall. We later the finished the basement which became my first dedicated listening space. The other two houses we've owned since that time were chosen as having a dedicated listening room. Other than the audio room and the garage, the rest of the house is hers.

rw