Matching tweeters/ amp. Headroom vs impedance.

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   Hi.I'm doing 6 top boxes with 1 Horn + 4 x Beyma CP22 each. 
I will run it with a Lab Gruppen FP6000+. 2 channels for horns and other 2 for Tweeters.

CP22= 8ohm, 25w aes

Lab channel gives:
16ohm  325w
8ohm    650w
4ohm   1250w
2ohm   1500w

Depending the event/ place will be 2 or 3 boxes per side. So have 2 options:

- 4 CP22 x box In serial = 32ohm 100w x box. 
2 boxes= 16ohm 200w aes. 125w headroom (amp gives 325w)
3 boxes= 10'6ohm 300w aes.  +- 180w headroom (amp gives +.480w)

- 4 CP22 x box In serial + Parallel= 8ohm 100w x box
2 boxes= 4ohm 200w aes. 1050w headroom 
3 boxes= 2'6ohm 300w aes.  +- 1100w headroom (amp gives +.480w)

My doubt is what way to take...
Go to High impedance= best quality sound but less headroom
Go to less impedance but more headroom, better life for the amp. 

I control the system with a Xilica and Lab gruppen also has the rear gain adjust so no problem with the gain.

Thanks in advance.

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PuppaBB Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 January 2011 Location: Bilbao Status: Offline Points: 112	Post Options Post Reply Quote PuppaBB Report Post Thanks(0) Quote Reply Topic: Matching tweeters/ amp. Headroom vs impedance. Posted: 25 February 2017 at 8:49am
	Hi. I'm doing 6 top boxes with 1 Horn + 4 x Beyma CP22 each. I will run it with a Lab Gruppen FP6000+. 2 channels for horns and other 2 for Tweeters. CP22= 8ohm, 25w aes Lab channel gives: 16ohm 325w 8ohm 650w 4ohm 1250w 2ohm 1500w Depending the event/ place will be 2 or 3 boxes per side. So have 2 options: - 4 CP22 x box In serial = 32ohm 100w x box. 2 boxes= 16ohm 200w aes. 125w headroom (amp gives 325w) 3 boxes= 10'6ohm 300w aes. +- 180w headroom (amp gives +.480w) - 4 CP22 x box In serial + Parallel= 8ohm 100w x box 2 boxes= 4ohm 200w aes. 1050w headroom 3 boxes= 2'6ohm 300w aes. +- 1100w headroom (amp gives +.480w) My doubt is what way to take... Go to High impedance= best quality sound but less headroom Go to less impedance but more headroom, better life for the amp. I control the system with a Xilica and Lab gruppen also has the rear gain adjust so no problem with the gain. Thanks in advance.
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eyeT Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 10 April 2016 Status: Offline Points: 71	Post Options Post Reply Quote eyeT Report Post Thanks(0) Quote Reply Posted: 25 February 2017 at 10:32am
	Does your fp6000 have vpl switches/settings on the back with the gain adjust? You should be able to set the output voltage using those. Just re read the question, not what you were asking, my bad Edited by eyeT - 25 February 2017 at 10:36am

Earplug Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216	Post Options Post Reply Quote Earplug Report Post Thanks(0) Quote Reply Posted: 25 February 2017 at 10:39am
	I'd make the boxes all ('standard') 8 ohm - and use a smaller amp! That's a big amp to use on tops, it seems wasted for that. It would be better employed on mids (or bass). Just my .02€.
	Earplugs Are For Wimps!

bob4 Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843	Post Options Post Reply Quote bob4 Report Post Thanks(0) Quote Reply Posted: 25 February 2017 at 8:37pm
	do serial 32 ohm boxes. two in parallel on one channel, at 16 ohm. one tweeter @ 1 W: 107 dB one tweeter @ 32 W : 122 dB eight tweeters @ 32 W each: 131 dB sixteen tweeters @ 32 W each: 134 dB total 256 W/channel, within amplifier spec enough to give your audience a lot of sizzle and some serious tinnitus if you get carried away