help re speaker replacement...ohms!

[mr.tourette]

In my quest to improve the standard audio on a budget (full thread to follow when finished) in my e89 I move onto replacing the 6.5 mid bass footwell woofers, I have 3 products in mind but one set has good reviews and won't need adapter rings by the look of it, they are however 3 ohms rated rather than the 4 ohms that the current system uses.

Now I'm not really sure how this will affect overall use, online research shows that they should work fine but advise not running at full volume for any length of time, most of this info comes from people using seperate amps rather than running on head units.

So..any real world e89 biased info that will help, obviously I'd rather not burn out my head unit, to get good top down levels I would want to run the head unit at full volume from time to time, the new door and shoulder 4.5 units take this comfortably whilst still giving the clarity improvements I was after, just want the footwells to follow suit, if that means spending a bit more then so be it but if the 3 ohms speakers are ok then ill be a happy with the slight saving and simpler install

Cheers

 

[Anonymous]

The impedance is nominal ie it varies with frequency amongst other variables..

Your head unit (yours is the basic head unit?) is underpowered and a lower impedance will stress it further.

All modern systems have thermal shutdown so overdriving it will not damage the amp..

Overdriving an amp does cause severe harmonic distortion which may damage the tweeters..

Summarising this 3 ohm is not going to be the end of the world, it will stress an already underpowered system but not by much.

Your desire to wind it up with the roof down will emphasise the weaknesses..

 

[mr.tourette]

Thanks Pete , kinda what i suspected based on previous research but good to have it confirmed, I will stick to 4 ohms speakers with the head unit being underpowered as is, if i have to chop up the old speakers for mounts so be it, pretty much junk anyway

 

[ph001]

Pbondar has it bang on. You will be fine with nominal 3ohm speakers as most nominal 4ohm units will typically drop to around 2ohms or so at certain frequencies.

 

[mr.tourette]

Pbondar has it bang on. You will be fine with nominal 3ohm speakers as most nominal 4ohm units will typically drop to around 2ohms or so at certain frequencies.

Cheers Champ