Leslie bass resonance

[Fanatic]

I have 1990 Leslie 122 with styroform bass drum and plywood cabinet. It has a strong resonance around lowest A, that sounds twice louder than other bass notes. Repositioning within the room doesn't make difference. Is it possible to reduce this effect?

[Greg_M]

Equalizer?

[jdoc]

damping material (mice got mine)

[bourniplus]

are you sure it's not the room itself that resonates this way?

[Fanatic]

The only way to know is to move Leslie into another room.
As I understand nobody else had the same problem with bass notes?

[tonewheel1966]

If you could get hold of the correct meter, you could check the readings of the lowest frequencies. It could be the organ has a louder note. Can you check it on another speaker?

I had to get rid of the computer tower in my studio because when I play the C3 through the 760 it vibrates it badly!

Cheers

Dave

[Orgrinder010]

I doubt the tone generator is the problem, the bass end should never drift unless it was badly mishandled.

These newer leslie's are made of MDF or something similar, correct? There shouldn't be much resonance at all if that's the case. My vote is also the room itself.

I always put a weight on the note that sounds off, and walk about the room to get a sense of what others are hearing. I had a similar case in the past with an organ which the organist could not hear much of the bass pedals at all sitting at the console, yet anywhere else in the room it was almost overbearing (and the leslie was only about 6' away!). Just rotating the speaker 45º solved everything.

Acoustics can be funny like that.

[Fanatic]

I apologize for my English, as I will try to explain things, that difficult itself to explanation.
I have measured organ output and it is really uneven. Each drawbar has its own volume curve, and this curve are not equal for 16' and 8' drawbars. For example, on the pedal 8' curve is fairly even with slow rising in the lowest octave. The 16' drawbar curve has noticeable rising on low A-flat, A, A-sharp. And then G is much less and all notes are rather uneven.
My Hammond has red capasitors, that don't tend to loose their values for a while. So, Do I have possibility to regulate note output other way than changing TG capasitors?
Can I assume that this uneveness was factory build to compensate uneveness produced by Leslie or tone cabinet? Or it appeared by the time?

[Admin]

The only way to know is to move Leslie into another room.
As I understand nobody else had the same problem with bass notes?
Did you try positioning it in the very center of the room to check for the problem?

[rusto]

Or take it outside.

[Fanatic]

As I have discovered (thanks to tonewheel1966) that the reason is in organ itself not in Leslie or room, I think this thread can be closed. But the question is still there, what can I do to make bass notes more even?

[Greg_M]

Get a 30 band equalizer and a Sound Level Meter from Rat Shack and do a tune up.

[ShadyJoe]

But the question is still there, what can I do to make bass notes more even?
You could re-cap the TWG and recalibrate it, maybe just recalibrate.