Infinity Kappa Perfects - can I temp run them off my headunit?


Bronze Member
Username: Palanza

Post Number: 17
Registered: Dec-05
They are 100 watts RMS - and my amp is on backorder - just wondering if I can install them and run them off my headunit (which is like 30 rms?) as a temp thing just so I can listen to music. Reason being is I'd like to work on the install until my amp comes in.

Would that hurt the speakers at all?

New member
Username: Kpee51

Post Number: 1
Registered: Sep-04
You shouldn't drive the perfects from the head unit as there is a fair chance that the amp will clip and produce large amounts of harmonics. Even though you only have 30W rms you can seriously damage the speakers.
Having worked for Harman UK we have seen large number of units returned with damage to the voice coil caused by low power.


I also have Kappa perfects, I was wondering if too much power from my amp will blow it off cause my amp has 170rms per channel and the perfects only has 100rms..

Silver Member
Username: Theelfkeeper

Stockbridge, GA USA

Post Number: 745
Registered: Feb-05
You should be fine hooking them up to your HU, they won't sound near as good as they will with an external amp.

Silver Member
Username: Tdbdadrummer

Post Number: 832
Registered: Aug-05
Yes, Brandon is right and Keith is partially right.


If you push your HU into clipping (above 30W RMS), then yes, the current could damage them.

You can give a 5000W RMS sub, 50W RMS that is unclipped, and there won't be damage to the sub, just that the sub will not perform to optimum capacity.

Anon., as long as you are responsible with the extra 70W RMS, and don't OVERDRIVE the speakers, it's not a problem. You can hear the distortion in the speakers when they are A.) Clipping or B.) Being overdriven/powered.

Silver Member
Username: Tafkam


Post Number: 193
Registered: Apr-04
I ran my Perfects off the factory GM headunit (probably 4 watts rms if that) for about 6 months while saving up for an amp and aftermarket hu. Was ok but be carefull how loud you turn them up, when I turned up the volume too loud with the factory unit I noticed the woofers starting to sound muddy and distorted.

Much better with the amp, they are getting 100 watts rms and even at fairly loud volume they don't do this anymore.

Silver Member
Username: Tjmutlow

Post Number: 598
Registered: Sep-05
if those are new kappas, they ar 2ohm speakers, I would not run them long on a radio, since they are rated for 4ohm loads.....

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 1437
Registered: Sep-04
okay i read this on so im almost postive its solid information. if u give a speaker 1/4 or below the rms wether or not the signal is clipped or not you CANNOT hard the speaker. even a clipped signal of 1/4 the power will not reach enough heat to damage the speaker. however once u start clipping the signal the sound will not sound good so if u really like ur music youd watch the volume level anyways.

as far as the radio load ty is talking about. its its true that ur speakers are 2 ohm and the radio is designed for a 4 ohm load i woulndt do it....

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 1438
Registered: Sep-04
harm**** not hard the speaker lol

Bronze Member
Username: Palanza

Post Number: 20
Registered: Dec-05
Well, my kappas run at 4 ohms. I guess they arnt the brand new ones. My headunit is pushing 22x4 watts. As long as I keep them from clipping it'll be ok. So, alright then - sounds good.
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