IN CHASING FOR THE FINAL EXTRA BOOST IN THE TOP FREQUENCY RANGE

[♔Chello]

LATEST ADJUSTMENTS - EUREKA

Known theories are always a good starting point, but only practical experiments and the ears tell the real truth.

I always strive to find the crossover frequency that gives the most natural sound possible, and this is always at the low end of the working range that is stated/measured; especially when it comes to tweeters.

To achieve this, the unit should have high efficiency and high power tolerance.

I first tried to locate the upper extreme by choosing a crossover frequency as high as 22,000 Hz (!).

This gave a surprising amount of content, but the sound was too sharp with unpleasant s`s for vocals.
So I went back to the textbook, which suggests that the lowest possible crossover frequency is the most suitable.

By changing the first choice from 13,000 Hz to 14,650 Hz and choosing a different type of capacitor, all the unpleasant s`s disappeared, and there is still enough level for the higher frequencies.


Next, I did the same with the JBL horns:
I connected 2 capacitors of the same type as for the tweeter in parallel, so that the crossover frequency became 1185 Hz, hoping to remove the marginal tendency for human voices to be shrill.

Eureka!
The shrillness was gone, and I can play relatively loud (80-90dB) without things going wrong, and still have the gain from the horns.


CONCLUSION:
I have spent a lot of my time experimenting with both 6dB and 12dB filters, but 6dB is what works best (just a capacitor without a coil).

I have also spent a lot of money on acquiring different qualities of capacitors, only to find that the more expensive ones in my case were not the best.

The more expensive ones were from Jantzen Audio which are very highly rated, while my choice was SCR, which are far cheaper and the ones that most resemble Sidereal (Sidereal Akustic Audio Systems), which are my reference as the best.

SCR is widely used in more expensive Klipsch systems, and I have used these for many years.


The last (temporary..?) step in this process will be to construct cabinets for my 40 cm bass woofers from Great Plains Audio, which can go all the way down to 20 Hz, but the cabinet will be insanely large; about 470 liters..!

I already have a subwoofer that goes well below 20 Hz, so I can make the cabinet significantly smaller; ideally so that I get the bass from 40 Hz and up.

For space reasons I am limited to a size of about 150 liters, as these must be placed behind the keyboards in front and to the sides for the existing subwoofer.

I will start making the cabinets soon, so we will see if the guess of 150 liters works as hoped.