wiring multiple sets of speakers

I have installed a 2 amp Zapco stereo with a PX  equalizer and a panasonic deh7900 deck. I have 4 midrange MB Quart & 4 MB Quart tweeters that the box says are 4 ohm. When I run the ohm calculator should I include the tweeters in assessing the true ohm load? this comes out at .5  If I exclude the tweeters it comes out a 1 ohm. Problem is that the amp (running all 8 speakers) is blowing fuses at high volumn.  The Zapco amp wants a 4 ohm load. If I run in series on the calculator, all 8 speakers come to 32 ohm. So must I include the tweeters in the calcs & if so could I run the speakers in series or is that too much resistance?

The system is wired as follows: 200 amp to woofers, 150 to mid's & tweet's.

2003 GMC 1500HD truck

Thanks for any help

Brett

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BC

Two stereo amplifiers, right? As in "two channel" amps? A total of 4 channels, correct? 4 SETS (16 drivers total) or 2 SETS (8 drivers total - this is the one I am guessing...) of Quarts? Did they COME as sets, with crossovers and everything? I am only asking because I don't completely understand your post. Are you using one amp for mids/tweets and one for sub, or both amps (all 4 channels) for mids/tweets. I think one issue here is that you don't completely understand what a passive crossover really does, besides "cross-over".

Passive crossovers can ONLY be run in parallel, with the appropriate speakers attached to the outputs. The crossover makes certain that the amplifier only sees the tweeter above the crossover point, and the woofer below the crossover point. This means that if you have 4 ohm tweeters, and 4 ohm mids (or woofers), and your crossover is correctly designed, then the amplifier only sees 4 ohms, NOT 2 ohms. Two sets in parallel would be 2 ohms.

If your amplifier only wants a 4 ohm load, then you can ONLY run one set of these speaker sets per channel. You need either a higher impedance speaker system or you need an amplifier that is stable to a lower impedance. If you are running one of the amps to the highs, you can dedicate both amps to highs, running both of them in stereo, one set (one mid, one tweeter, and crossover) of speakers to each channel, and get another amplifier for the sub.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Yes that is correct 2 amps @ 2 channels each....I have 2 sets of quarts (8 total - you guessed correct) yes they came as sets mounting either coaxial or separete but using the same crossovers.I am using one amp for mids/tweets & one for the subs as you guessed also. So according to your post, I'll need to get another amp for the subwoofers, I can't really change out the mid/tweets at this time & since they are 4 ohm....I'll have to use another amp for the subs.

Will I have a problem with the one amp (200 watt) & other amp (150 watt) when hookingthem up to either channel? Volumn issue being louder on one side than the other?

thanks again

Brett

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BC

or I guess I could run the front doors on the 200 & the back doors on the 150 eh? that should work ok?

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BC