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: Talking about the midbass….Posted by Romy the Cat on: 10/20/2010

Despite the fact the I lost the quality of the lower knee of my midbass horn (I guess the primary resonance went all the way down) I keep trying to catch the right termination of midbass low pass filter. I bought those expensive 20H coils and added it to the existing second order line level at 107Hz. The 20H coil formed another first order at around 120Hz. Sonically it was very bad – the whole rich midbass tail got striped and sound lost lash and richness. The 20H coil made almost the their order filter (coals with second order at line level) and it is too much .

Continuing experiments I concluded that somewhere between 3H and 5H will be the right final filter. Theoretically it would make the second crossover break at 600-800Hz . In practice, considering the high inductance of the Vitavox 15” driver and that the driver’s VC is in series with the filtering coil only God knows what the effective crossover they form. I do not bother to figure it out and to measure it but juts tune the roiling inductance by hearing what Sound does. I know very presence how I need it to sound and how I would like the midbass decay to be.

Talking more widely about the midbass in my specific implementation I have to tell you that my upperbass horn greatly saves my ass. Without a full duty of upperbass horn the midbass project would be a failure sonically. In fact the fine tuning the upperbass in relation to the room and to midbass is very very powerful tool to shape the sound in the whole room. This is a direct modification the size and impact by the “melody range”. Rubbing the midbass against upperbass it is possible to shape all imaginable effects the form the bone of the whole sound in the room. Playing with crossovers, plate currents (modifying damping a bit), with volumes and with the way how the lover MF (Fundamental channels) talk with upperbass/midbass it is possible to get very luxurious sound with gloriously-rich lower en. I do not have the final confederation yet but I have a few settings that I truly like. I would not have problem to settle with any of them…

The Cat

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