Monitor 7c fuses

DON73

I've noticed that when some here upgrade their crossovers they do away with either the fuses or Polyswitches. Last night both fuses on my Monitor 7Cs blew at the same time. I was playing them loud but no louder than usual. I'd say about 95db.. If there had been no fuses or internal safety switches I may have killed the tweeters. I'm using an Adcom 555ll with an Adcom preamp and 14ga wire. The tweeter are the SL1000s and the fuses read 250v.
Anyone here have any problems after eliminating fuses and polyswitches?
TIA

DON73

Sometimes I feel like Rodney Dangerfield and at times like Mick Jagger:biggrin::biggrin:

mhardy6647

I feel better with fuses on the Peerless tweeters in my 7As. The Polyswitches are of the Devil, though.

george daniel

If you bypass the fuse,, you need to be sure that you are NOT clipping your amp,,which typically blows tweeters when clipping occurs.I have a pair of 7c's and I've never blown a fuse,,you may not want to hear this,,but it might be possible that you are clipping the amp,,hence the blown fuses.Carefull with the volume Eugene

DON73

Thanks for your replies. I think I'd better keep the fuses in although I didn't think I was overdriving the amp. It's possible....and I'll keep the volume just a tad lower. Thanks again.

mhardy6647

Unfortunately, most solid state amps clip "dirty" - as they go nonlinear, the distortion they produce is rich in high frequency harmonics (think of a square wave, which is what clipped waveforms approach, more or less asymptotically). You might not hear it, but your poor tweeters do. Most real music will have relatively little energy in the HF and consequently require (and consume) relatively little amplifier power to ultimately be distributed to the tweeters - but at clipping, all bets are off :-(

Truth be told, I used to pop my tweeter fuses more than occasionally as a lad on my 7As on Daltry's scream near the end of the Who's Won't Get Fooled Again - this was combination, no doubt, of inner groove distortion (last track on the album), youthful hubris (just a tad too loud), and a hair less amp oompf than needed (45 wpc Yamaha CA-610II - stilll "on line" in our family room after nearly 33 years).

DON73

I was playing Bonnie Raitt's "Papa Come Quick" when the sound changed.

"Papa come quick mamas crying in the kitchen
She cried right through As The World Turns
I seen it my self and papa it's a bitchin
Let's haul **** before the baby gets burned:biggrin::biggrin:

gcarrig

i am trying to fix my 7c s i found some 7 b tweeters to replace my blown tweeters what are the size and numbers for the fuses would like some help

SeleniumFalcon

They should be 1.0 ampere fast blow fuses.

F1nut

gcarrig wrote: »

i am trying to fix my 7c s i found some 7 b tweeters to replace my blown tweeters what are the size and numbers for the fuses would like some help

What model of SLxxxx tweeters did your 7C have and what model of SLxxxx tweeters did you find?

gcarrig

i dont have the old tweeters, speakers were in my basement for along time i ordered some o194 sl1ooo hopefully they will work i think i need mw6502 driver too
k

gcarrig

thanks for the information