JL Audio ZR650-CSi

[zero7404 10+ year member]

can anyone tell me what the physical frequencies each driver is reproducing ? i am doing away with the passive crossovers to do an active crossover setup. also, these comps are rated @ around 85 RMS by JL, but rumor has it they can handle more. does anyone know around how much clean undistorted power it will take to blow these comps ?

the 5.1K i plan on using is rated @ 60 RMS for the tweeters, 170 RMS for the woofers. but of course, this is Audison we're talking about, so i assume actual will be more.

according to good sound system practices, you can safely drive a speaker with twice it's rated RMS without blowing them, provided your signal is squeaky clean and the speakers have enough air to breathe.

any advice would be great. getting a response from JL about this info is going to take a while.....but i did ask.

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[CrossFired 10+ year member]

I'd roll the mid off at 2000 @ 12db and cross the tweet at 4000 @ 12db. this way you'll avoid a bump at 3000(3000 is a very hard sound) If your going with an 18 or 24 db? you can bring those # closer together.

 

[zero7404 10+ year member]

i think the slopes in the amps are set to 12 dB. i got the specs from JL tech support today. they say the following:

Tweeter: 8‡, 4KHz – 25KHz, 70watts

Woofer: 4‡, 48Hz – 6.2KHz, 70watts

Crossover: High-pass: 4.8KHz@12dB/octave, low-pass: 2.2K(low), 4.4K(ref), 13KHz(high)@612/octave

i was shocked when i saw the tweeter is 8 ohm.....because the amp is rated to feed 60W to a 4 ohm load, so with 8 ohms that will deliver less power. woofers are 4 ohm, so they can get up to the full rated channel B (170W).

i am not really sure how this will sound with this amp.....theoretically, it can probably redistribute more juice to the tweeters when available, but if they will only see about 30 or so watts, while the woofers can see 170 watts, and the sub can see 750 watts, i feel like i am giving the tweeters the short end of the stick....

is there a way to change the load of the tweeter to 4 ohm ?