How many watts should I send to this setup (coaxial plus tweeter inline)

[ckunke002 10+ year member]

I have a single 4 ohm coaxial speaker that can handle around 50w RMS, and to bring up the treble a little bit to the head level I'm wiring another 4 ohm 40w rms tweeter + to + - to - to the coaxials terminals. It's my understanding that the tweeter won't even affect the impedance until notes are playing in it's range (and it's crossed over pretty high.. around 7k)

My question is, what overall impedance should the amp be seeing with the combination of a "full range" 4 ohm speaker and a 7khz+ 4 ohm tweeter? And how much voltage should i set the gains to deliver to the combination? Would 90w be too much, considering that the tweeter isn't playing a good deal of the music? Any advice is great.. thanks

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[ckunke002 10+ year member]

Anyone have any thoughts?

 

[mlstrass 5,000+ posts]

tweeter will affect imp load, wire them up and put a DMM on them and see for yourself. Changing imp load will also affect the xover point/slope of the caps or whatever the coax uses.

How about get a set of comps and mount the tweets in the A pillars if you really are trying to bring the stage height up. If you just want to be louder then adding a set of tweets won't make a difference...

 

[ckunke002 10+ year member]

tweeter will affect imp load, wire them up and put a DMM on them and see for yourself. Changing imp load will also affect the xover point/slope of the caps or whatever the coax uses.
How about get a set of comps and mount the tweets in the A pillars if you really are trying to bring the stage height up. If you just want to be louder then adding a set of tweets won't make a difference...

Not much louder, but hopefully bring the treble up just bit. I did buy a set of components, but couldn't afford to spend that much x2 for the rear as well.

But anyways, I already have the tweeters and want to try to use them