GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.

Post Subject: The final MidbassPosted by Romy the Cat on: 10/28/2010

Got the ultra low DCR toroids coil and pit them in use. Yes, it was very right move and they a bit trimmed the midbass tail. Playing with inductance and listening how the midbass decays (measurements are worthless in this case) I ended up with 4.8mH coil. Against 15R drive it is around 500Hz first order crossover. The most precisely is imposable to get for this type speakers level filter. So, I have First order 20Hz and second order at 107Hz bandpass in the amp at line level and then first order at 500Hz speakers level. This make is sort of 2.3 order filter. The sound not from the midbass horn is something that I call “proper sound”. I very much am proud by the way how I manage to integrate midbass into system. Many people tend to spend a lot of effective efforts into midbass solution and love to show it off. My horn is superbly disciplined and it goose what is called upon to do, nothing else. From a listening position a listener, even an experienced one would never say that there is a midbass horn in operation, not to mention a listener would say where the horn installed. The trick I pay with upperbass horn truly pays off.

So, the Midbass I think in it’s final stage, I do not feel that I need to do anything with it. The crossover is set, the back chamber is sealed and weatherproofed, the amplification channel is set and calibrated. I would love to raise the resonance frequency for 2-3Hz sometime in future but let see how it goes – I will return to this subject next summer. I load the bass channel to 1500R that is a very deep idling. I have superb dumping but I have all power eaten by transformer. So, if I run the output tube with less plate desolation then 55W then I get some clipping at very loud passages. Therefore I drive my bass amp pretty hard and I am considering loading the tube a little bit more and I would like to have some power headroom. This loading will come alone with a new OPT transformer with fast core. This will be a project for future.

Listening the sound all together one would be surpass how much this Sound is similar in the concept to the sound I had in my old listening room. Yes, I do feel that midbass is better in the new room but the room is many times larger. I in fact so pleased with the midbass integration that I last night “officially” invited a local audio guy to hear how nice it all turned out to be – something the I did not do since I moved in my new listening room.
The thing are getting along well and the only main thing now is to find the final proper configuration for the ULF channel/s

Rgs, Romy the Cat

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