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Recently I removed
The horn does not properly load the fram down that low, so power handling goes way down, and pattern control issues arise. Bad idea IMHO. If you can get a set of the original 604 horns you might do it.
I always thought 604 bass speaker was a 416, not a 515, so if that were true, then they'll go up to 1,600 pretty easily. But I could be wrong and Old Guy is right if the horn won't load the high diaphragm atbthe bottom, you'll screw it up.
:) hahhahhah lol
This means that you are missing something ( response-wise ) in your setup. When they sound good, it means that the number being played was not that dependant on the missing portion of the spectrum, and the other way around for the bad sounding days. Assuming that everything about the drivers & the enclosure are standard, it has to do with the xover only. I had suffered similarly for nearly 2 yrs. with my A7-500, and it was finally over for me recently. Ofcourse it ended up with me having kind of a refresher-course in xover designing.
Cradeldrof, what other gear are you running? Personally, I could never listen to my Altec speakers without a graphic equalizer and while alternatly listening to CD's, Youtube videos, and Movie DVD's, am constantly adjusting the EQ not only for each different format, but each different CD, or video. They are all recorded differently and each has to be individually adjusted to taste. It is a time consume task, but is a necessary requirement for listening nirvana. Altec, more than any other speaker brings out all of the flaws in recording engineering.
I don't really know because I don't have one, but I thought that unless you have true 5.1 with a center channel speaker, you will never be able to balance the voices vs soundtrack vs special effects from a video source. I would worry more about how the system plays audio music rather than video. When are they going to split soundtrack voices from the rest of the audio and give us control over how loud those damn special affects and music are on video?
Yes, OG is absolutely right.
For such a small horn, trying to xover it too low may damage the phram, as the air-mass (volume of air inside the horn) will be too less to prevent it from being over-excursed. On the other hand, the phase-plug as the name suggests, only prevents any phase cancellation from occuring within the prescribed bandwidth, which otherwise can happen as the phram is not a flat surface, and hence the path length from the periphery & the center of it to a point in front of it in space will be unequal. This difference will cause frequency cancellations at different spots throughout the bandwidth. The loading-caps when 'ON' will also prevent the phrams to some extent from being over-excursed, but it usually is the happiest when the pressure/loading on both the sides are similar (linear excursion), which will not happen here for this horn if the xover was too low, even though the caps were on.
There is no need to worry about negative attitude etc. We all are beyond that.:)
Coming to the subject.....yes the air thru the phase-plug slots is enough to find resistance in the horn pipe. It is also to do with frequency. Actually these drivers are very much like a rugged-ized microphone. Forget about this, think of a 515 in a 825/828, and think of the cone movement...and how little it is !
Yes you are right by saying that you have not yet got the feel of this subject.