I decided to buy a pair of these off ebay.. i gotta tell ya... i really do not hear anything outstanding..
The speakers have a very wide soundstage thanks to the horn. They have clear sound and deep bass but the vocals are too shallow. the highs are too high. teh bass is too thick... So, I took out the inner stuffing. That white clothe stuff. Yea I know all about what that stuff does.. I been doing audio for 35 years.. anyway.. it cleaned up the bass. It sounds a bit better however the speaker overal geberally is just not all that outstanding.
What it does do very good is through the sound out side of the enclosure. its almost liek surround sound.. however the tonal sound is not outstanding..
The bass is the deepest ive heard from any bookshelf of its size but the problem is its a bit augmented by the port and so i find it has too much bass even when someone is talking and has a low pitch boice the voice sometimes have too much bass... where as often the voices are too laid bad or shallow or .. i dont know.. they are just somewhat missing..
There are 2 electrolytic caps that can be replaced with something better... They are easily assesable and probabbly easy to swao put for teflon or poly caps.. electro caps just suck so bad.. This may help the mids..
The highs go wayyy up there. I can hear super high frequencies clear ... in some songs like old Madonna music the instruments will be well outside of the speakers and you can actually look at and point at them.. however like i say, the tonal value is not so accurate...
also i am getting ear fatigue... not sure why.. its rather aggrivating.. its not bad.. its more like fatugue from all the different things i can now hear in the music.. its not really from all the highs... If I can increase the vocals they would be much better... I might work on than in the next week or so.. I have several different audio caps i can try..
Anybody have a schematic for the crossover? that would be very useful. Allot fo times there are things you can do to it to make the sound way better.. Either this crossover has a very high crossover rate or there is some sort of equalization and zobel networking goin on .. it has more parts in the crossover than i ever seen in a bookshelf... Them cement resistors can be upfraded to metal oxide as well....
UPDATE: I got the schematics and bad news for your JBL 5 series fanboys..
The mids on the 530 and 520c use **** crap electrolytic caps.
I do not know about the other models..
The 2 large black caps need to be replaced with better poly caps.
The rating for the 530 midrange is 24uf 100v and on the tweeter it is 12uf 100v.
The rating for the 520c midrange is 27uf 100v and on the tweeter is 15uf 100v
CHANGE THESE! Repalce them with Poly caps or whatever favorite caps you like. Just change them cause they are sucking the life out of these speakers. Have no idea why JBL would make such a great crossover with all those poly caps and skimp out on just these 2 caps. Dam shame.
ALSO on the 530 and 520c there are cheap ceramic cement resistors which need to be changed. These are not such a big deal but I am changing them to non incuctive higher quality parts.
The 520C has 3 resistors values at 12ohm and 5.1ohm both at 10watts and a 2ohm 5watt
The 530 uses 3 resistors values at 16ohm and 2.7ohm both at 10watts and a 1.5ohm 5watt
Changing these all on a 5.1 surround sound setup will cost around 100$. This upgrade should be significant because we all know electrolytic caps just plain suck.
Also it seems the crossver has MANY circuits on the tweeter which look like eqalization and impedance compensation. The mid has one small cap on it which seems to be just some sort of safety cap for dc voltage across the + and - of the mid. This cap is valued at just .01uf 100v on both the 530 and 520c. You could actually remove this cap and often see another upgrade in sound because its sapping off some of the potential in exchange for safety..
I do not want to remove the tweeter circuits, just change out the parts that can be upgraded becuase the circuits on the tweeter are complicated and could be detrimenatl to the overall tweeter performance.