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And the first impression is that clarity increases over the entire freqeuncy range, and especially the midrange and bass section. It really works fine. Now I only need to fine-adjust the gain and EQ of my system. I have a long tweaking period ahead of me. If there are any hints of how to do this properly without having measuring equipment, comments would be appreciated.Thomas
Follow Ups:
I use a digital Parametric Eq (Z-sys) into a DSP digital x-over system (meridian speakers) and have set up my system using instruments etc and can just tell you this : The theoretical or measured "perfect setting" sounds like doo-doo ;)
Eventually , I tuned my system so that it sounded good to me despite its departure from "flat" etc - at the end of it all , you have the vagaries of the room , the speakers , the recording and the fact that there is no reference as to what perfect sound is , your aim is to enjoy the music as best you can and allow it to create whatever reality floats your boat , do it by ear.
What you can do is make or get a test disc (there is an excellent test disc called Soundcheck 2 - Alan Parsons) and use a decent digital SPL meter to get a baseline as to freq etc and take it from there but I wouldnt agonise too much if you arent on the straight and narrow
I
Rodney Gold
Thanks,I think I'll try also to compensate for the room acoustics, so speaker/filter settings will probably not be flat. I have listened to a reference system with ±0.5 dB between 20-20000 Hz at listening position. I'll just try to keep the sonic impression in my mind. The first impression of that listening session was that my speakers delivered to much bass in its original (passive) version. Now I have lowered bass level, and it sounds more similar to the reference system. About the EQ though I have no real idea of what to listen for (the EQ settings is made by tilting the curve between 20-80 Hz ±3 dB).
Thomas
Sound "memory" has been proven notoriously unreliable, even over periods of just two seconds.
I am very well aware of that. BUT I can still note that the bass output was too high in my previous system compared to the reference system. This was very obvious. With respect to fine tuning, I agree, it is impossible to do any such adjustments by "memory".Thomas
Trying to fine tune a biamped system, particularly if the crossover is low is a tough act without instruments. Just where in the frquency range is your crossover? Knowing that would be a big help in making suggestions.
The x-over point is @ 80 Hz. You'll see more data on the x-over if you click on my system "Allegro".Thanks for your help
Thomas
As my first suggestion, I would reccommend spending $60 and getting the Infinity R.A.B.O.S. kit (no it's not an organization bent on world domination from a James Bond movie) It comprises a sound level meter, a test CD (20 to 100 Hz), good instructions, and some graph sheets. It works very well. I used it to set up my system(also an 80 Hz x-over) and loaned it to a friend who was having fits trying to set his system up. Helped us both a lot. You will need a good tripod to mount the meter to. I've made a lot of acoustical measurements over the years and I was surprised by the repeatability of this system. The meter is specialized and is not a general purpose sound level meter, but it does the job for bass range set ups.If you don't want to do that, then I would suggest finding some CDs where is a bassist playing progressions up and down the range of the instrument, and listen for holes and peaks. The problem with this is that your hearing memeory is poor, you have no idea if the recording is anywhere near linear, and your hearing sensitivity in the low bass is very dependent on the level you're playing at. The Fletcher-Munson Effect. This is my ninth biamped system (with active crossover) and I've used instruments on all nine. I have tried doing it by ear, but with mediocre results) I used to borrow them from the labs at work, but now I'm retired I no longer have that luxury. The RABOS kit worked as well as anything I could have borrowed anyway.
Thanks,I'll look into that RABOS kit to see if I can get it here.
Thomas
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