TESTING

Hi folks, well, the pre-amp is back and the equipiment test was positive, power to spare. So with the cd player pluged into the tape input I tested the raw drivers, all eight of them. And with out having been lifted or time aligned or contained or crossedover they sounded pretty good, which tells me that all the equipment is working just fine and the speakers just need to be fine tuned. We are still waiting on the most crucial part, the inductors, which hopefully will be coming along soon. Until then have a blessed day.

Good day folks, it would seem that the law of supply and demand also works in reverse. Over time, if there is no demand there will be no supply, and that is exactly what we have here. These inductors are a very sophisicated, esoteric part not to be created by an amature. I found some fantastic people willing to take on the challenge and I can not thank them enough. When considering design there were an infinant number of choices between amount of drivers and crossover points ect. to construct a speaker. I decided that if you wanted a 2,3,4,or5 way speaker just make it a 4, and if you wanted a 6,7,8,9 or 10 way speaker just make it an 8, and that will be the focus of this blog for the forseeable future.

Design cont...

Design cont.

Greeting people, I finally found someone to make the inductors needed for testing, they are being made now. As you must trust the people and their work of the past you must also trust your equipment. I am using the famed hafler 500 amp and its companion the DH-101 preamp along with a cheap cd player. These have all arrived but they do have some age 25-30 years and the equipment test confirms this. I am going to start with the preamp and have it rebuilt like new, perform another equipment test and go from there. I hear all this talk about digital speakers, but they have been at it for awhile and I suspect they may be having difficulties reproducing varying magnetic fields digitally. So while they are doing that we shall forge ahead. That's all folks.

design cont....

Alright folks, I know we are like a week early, but, unless you want to do all the work yourself you must rely on and trust the work of the people that came before you. In this case, I do. We also can not thank the people enough for their tireless efforts of the past, for with out them none of this would be possible. There is a slight parts delay, you need to get as many of the parts correct the first time around so as to not lose ground later. This part happens to be the inductor which they say is a simple part but you have to understand how an inductor works in order get the right one and that's not so simple. The 24db/Oct device should be sufficient to fill a 20'x40' room and there are no forseeable problems associated with that. The commercial 48db/oct device is another story, it seems that the 48 numbers do not exist because of the degree of difficulty deriving the 24 numbers. So I shall attempt to extraplicate the 24 numbers and test that to hear if there is anything detectable to the human ear, or mabey a driver can pick up some differences at louder volumes.

Above is the enclosure that will be used for testing, the final design will be discussed later. I cut down some plywood and simply cut circles to match the drivers, well not so simply, you have to get the exact size hole the first time or try again. I burned through some lumber achieving that task. the location of the drivers is not exact but it is close and will be phase- arrayed in the end. So, when the time comes i'll get back to you with more.

begin design

Greetings, earlier I explained the sound one wants to hear from your audio system, now we shall attempt to do it. The first order of business are the equasions used to determine crossover frequency and your db/oct filter. These can all be found at the link provided at an earlier post, you may have to pay for and then chase some information but it can all be found. There are some considerations though, first being the actual driver impedance vs the rated impedance. Even though a speaker is rated at lets say 8 ohms the actual may be different say 6.5 or 7. You need the actual number in the equasion in order for the numbers to come out right. So that is what will be done next, purchase drivers for the speakers,check the resistance, and use those figures to design the crossover network, then purchase the parts and build the network. This may take 2 or 3 weeks but we will be ready for photos soon after that. Oh gees, look at what time it is, I need to run and catch a banquet. Have a good day.

Hi, as you can see I would prefer to remain anonomous. I will tell you that my name is Mark Chembrovich and I have a bachlor of science degree in engineering from a small mid-west liberal arts college. I am currently turning my attention to audio engineering and the development of advanced passive crossovers and speaker design.