View Full Version : Powering the Components

09-23-2007, 09:43 PM
Just bought an infinity component set consisting of two 6x8s, two tweeters and two crossovers.
The 6x8s are 90w rms 270peak, and the tweeters are 50w rms 150peak.

To take advantage of the full power,
Is it safe to run 140watts (at 14.4v) to each pair?

Gary S
09-24-2007, 04:39 AM
Did they come as a set? What is the rating on the speakers as a set?

09-24-2007, 09:01 AM
Detailed Description of the 680.7cs:
Infinity Kappa 680.7cs 5x7" / 6x8" 2-Way Component System (Set)

component speaker system includes woofers, tweeters, and crossovers
Impedance: 2 Ohms
5x7" / 6x8" Plus One+ woven-glass-fiber woofer cone
Edge-driven MMD dome tweeter
Starfish™ mounting bracket for easier tweeter installation in factory locations
Power range: 90 watts RMS (270 watts peak)
Frequency Response: 45Hz - 25kHz
Sensitivity: 94dB
Mounting Depth: 2-1/4"
Sold In Pairs

09-24-2007, 09:04 AM
RMS is 90, so 140 might be pushing it. Also noticed they're 2ohm instead of 4ohm like most speakers, so make sure you check the 2ohm rating of the amp you choose, so you don't accidently over power them...

09-24-2007, 11:04 AM
The 6x8 is 90watts rms and the tweeter is 50 watts rms
I was simply adding the two rms ratings together to obtain the 140.

They are going to be wired into 4 channels(one 6x8 and one tweeter per channel unfront, and then two 6x8s for the rear)
If i fed 90watts rms to the 6x8 and tweeter, on 1 channel using xover, wouldnt that be underpowering them? Not using the potential 50watts remaining)

It seems they have simply listed the rms rating for the 6x8 and not the tweeter.
Any ideas?

09-24-2007, 11:09 AM
The crossover will send the frequencies below the crossover point to the mids and above the crossover point to the tweeters. Both the mid and tweeter will be getting the same power from that amp channel since they are operating on different frequencies.

If that doesn't make sense, here's an example that'll hopefully help:
AMP: each channel can provide 100w rms at 2 ohms.
MID: Will get 100w rms because the crossover filters 80-3000 Hz frequencies to it.
TWEETER: Will get 100w rms because the crossover filters 3000+ Hz frequencies to it. Although, the passive crossover will probably limit the amount of power actually getting to the tweeter through a built-in protection circuit.

09-24-2007, 12:22 PM
I did not know that the mid and tweeter, each on its own, will get the same power from that amp channel because they are on different frequencies.
Thanks for the post


09-24-2007, 01:04 PM
No problem. ;)

Gary S
09-24-2007, 07:25 PM
Power range: 90 watts RMS (270 watts peak)
Frequency Response: 45Hz - 25kHz

- The speakers are rated full-range, as low as they will go (45HZ)... in other words, no crossover.

If you use a high-pass crossover on the amp at 80HZ or higher, they should handle double the rated power.

09-25-2007, 10:21 AM
thanks for the info