Rerurn to Romy the Cat's Site
In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s lowest channel.
Post Subject: The new ULF scenario experiments.Posted by Romy the Cat on: 11/5/2010
fiogf49gjkf0d
 Romy the Cat wrote: |
| Even though quantivly and structurally bass is correct but it is not what I am looking. |
|
Last night I got rid the SMS crossover. I built in the 28Hz, 12dB per octave crossover in the Yamaha B2 amp that I use for ULF channels. Then I place an extra bass modules to the another active spot at the room and connected it all together.
The bass presentce is fine. I have enough bass and I was very fast found the right balance between ULF and midbass. The B2 amp has enough gain and power to handle that ULF- I run B2 with 7db attenuation. The quality of this bass is still not what I would like it to be. Comparing very fine differences between upper knew of ULF and lower knee of midbass I do feel that midbass is more articulate and coherent. In fact I am not sure if I like the result of “distributed bass”. The second bass module is located at different distance then the first one and I feel it mads the ULF quality. I might do so measurements and to see the arrival phase but with line-level passive crossover I do not think I will be able to do anything with it. The alternative would be to drive ULF location #2 from line level direct but the ULF location #1 from a digital devise with precise phase dialing. This would imply a different amplification and will be too much all together.
Generally the popular idea that at LF the time arrival becomes non-critical look absolutely ridicules as far as my experiments show. In fact the wrong arrivals of my ULF are the thing that bothers ma a lot in my current setup.
Anyhow, I am planning to close the book on the ULF channels this weekend. The pane is to measure and to calibrate bass with ULF firing from two locations. If it does not work then get rid of the location #2 and keep the location #1. Then adding a speaker level coil to the bass modules in the location #1 I will be trying to align the bass arrival to the rest of the sound. This might be an interesting solution as I would not mind if bass filter will be a bit sharper but the experiment with SMS crossover show that a full third order is too sharp and the arrival time become too far behind. I might try the trick with a fraction order crossover that was so successful with midbass. The problem that extra coil’s DCR driving the ULF is usually not very good idea. I was able to avoid punishment with it in midbass channel but I do not know if it will work in ULF. I need to hear how it will turn out….
Rgs, Romy the caTRerurn to Romy the Cat's Site