View Full Version : Leslie 21h bass response impovement...
09-13-2011, 02:10 AM
Is there a capacitor to change or some way of getting a bit more bass out of my 21H field coil Leslie? I imagine if you increase the current to the coil it will be louder? Or is that too simplistic?
09-13-2011, 03:47 AM
Maybe a passive attenuator on the treble side, then turn it all up a little more?
09-13-2011, 01:53 PM
Oh, there's a tone control on the organ. I did that because it's a red cap tone generator so we already no it's gonna be bright. I just want more bass thump. Apparently the can cap in there is wrong. 30-30-30-10 where it should be 30-30-10. So there is a 30 in a 10uf spot. Could this affect the bass response? Who knows? I don't have any idea but it seems best to wire in the correct values underneath and ditch the cap (which looks old anyway) It's Mallory. It's over-spec. So....more time fixing and less playing...uggh
09-13-2011, 03:18 PM
Placement is key with leslies -you can have 300 watts going to the speaker, but bad placement can rob all kinds of volume. Corners of the room are best, but sometimes it comes down to a few inches of rotation or distance from a wall to maximize bass response. I've noticed in some situations where low frequencies can be easily heard in some parts of the room and not others.
09-13-2011, 03:24 PM
I meant in the Leslie. Put a pot or L-pad or something on the horn side of the crossover. That way the horn is quieter, which makes the bass seem louder.
But since you're switching out the caps already, you might as well wait and see what that does for you.
09-13-2011, 07:36 PM
Yes the 30uf in the where the 10uf could cause loss of bass response. If I remember correctly someone else suggested to you a way to correctly fit/wire that can cap up......try their idea first. What organ is this 21h connected to? On all my TWG organs I've installed a unit from speakeasy called "Mo' Bass" Connects through the 16' pedal drawbar and works great. But I also have replaced all my 15" woofers with Delta 15b's. I like good thumping bass! Hammonds tend to be strong in the 200-400Hz range where as I like 100-200Hz range. As far as the FC speaker you have that is a good speaker even over the silver PM Jensens IMO
09-13-2011, 09:55 PM
Oh. Thanks. I'll get the 10uf where it belongs. It's a red cap B3. They are kind of bright if you are used to wax caps.
09-16-2011, 04:38 PM
I've got the same question, I have a 21H with the 15" Jensen F15LL field coil and it sounds great, but my 145 cab with the black jensen PM speaker is more bassy! It is a different quality speaker altogether, different sound, but strangely in a shorter cab and contrary to all the ground shaking bass testimonials that one comes across on the web regarding the field coil F15LL the 145 beats it.
At first I thought maybe it was the 21H amp I was using but later I replaced that with a 32h series III amp which I rebuilt following a local hammond guys guidance (new caps, capacitor can, various resistors), that amp has vintage tung sols and although the sound between the two amps is quite different and the 32h has more wattage and in my opinion sounds better it still doesn't beat the bass from the 145.
I will say that "Orgrinder010" is absolutely correct that the placement of the speaker and where you are positioned in relation to the speaker make a huge difference particularly in bass response, there are without a doubt hot spots in the room where the bass is preferable over others.
Seems like I remember reading a post somewhere by The Admiral where he mentioned something about a 820/145 mod speaker that contrary to the common logic was generating impressive bass and beating out some of heavier contenders in the Leslie bass arena...interesting.
09-16-2011, 06:02 PM
I really don't know what "kind" of bass sound people are talking about. I have two 145's and they eat the 122 and 21H alive. I give up. I think the little 45,145 sound is the best. The bass is just more defined.
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