GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project

Post Subject: A few random comments.Posted by Romy the Cat on: 1/9/2010

First of all we need all to understand that all channels attenuators need only for setting up phase of playback live. When the installations are set up properly then it is all not necessary.

Anyhow, if the upperbass has less output then you might use Fane Studio 8M with 8R voice coil and it will give you extra 3dB. Be also advised that when you balancing the amplitude between channels driving them from different taps then you change the loading of tube. So, dropping upperbass from 8R tap to 16R tap you will change loading to your MF canal that is driven from own tap. You might also for pick up 3-6dB of upperbass by dropping the reference of you MF channel – driving MF from 4R and driving upperbass from 16R. Mind you that we are taking about volumes, the loading for individual channel will be obviously screwed.

Adding attenuators is not so painless. For LF channels is obliterate leading edge of bass and for HF channels it rolls off HF on the attenuator’s inductance. For HF you might use the trick that I uses with my MF DSET where I put an attenuator in secondary. Still, if you do not use different tube then I would not use attenuator for MF.

Here is what I feel makes sense. The main bass and many MF channels shall not have any attenuators. The volume of those channels is permanently set as the described by the dimension of the room. This is the bone of the sound. The channels between – the Upperbass and Fundamental might be adjustable. I did not live with Midbass and Upperbass channels and my Upperbass is fixed. However, I have my own way to play with it, in fact I did in past I found the right configuration. If you remember I have Injection channel with 10” Red that in my box goes down 50Hz or so. So, sliding the bottom knee high-pass filter on the Injection channel I can add midbass output from Injection channel that would help to my Upperbass. The fact that Upperbass is on the floor and Injection channel near sealing is very helpful for the whole integration.

Generally what I detect that soon or later, having a control over all of it, one develops a sense how the Upperbass channels with MF channels need to be balanced and it is never an ambiguity. How to feel the space between then is a bit trickier and that does requires an adjustment for fine setup. Talking about the adjustment for channels out you shall not forget that if you stupid enough to do for DSET configuration then it will be more pain in ass as tubes will be losing gain with time. And you would need to deal with it.

The Cat

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