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a headunit has an internal amp designed and produced to do whats specified, the same way amps are. if it says 4ohm nominal on the headunit and 4ohm nom on an amp it designed for that purpose. Regardless the amp in either will never see a real 2ohm load. most likely 4-8 and even higher in most cases.

But the amplifier and power supply of an amplifier is more stout than whats found in a head unit, correct?

Thus my concern.

And my previous post let me rephrase what I put. Not so much of bridging a channel, but running a set of speakers in parallel to the head unit.

You can impedance rise and many other factors will increase the impedance regardless. however remember Series vs parallel. series = twice the voltage same current Parallel = twice the current same voltage. Like i said it will most likely be ok, its still a dumb tactic but it will be ok. how many times have you seem people run there subs at a lower load than recommended? its no different than speakers, i ran my MM4000.1's at 1ohm and .7ohm mono when lowest recommended is 2ohm. however my impedance rise in the end was 3.1 with a dcr of .7 so im well below dcr but my impedance increased to 3.1 which is y the amp was ok.

Well thats my point.

They are comparing apples to oranges...

My other point is saying "yes this is fine" opens to the next issue...

Then why cant I bridge my speakers?

Hi,

I review that link, it have good information.Theres no way to measure AC Impedance in a wire I know of? Isnt AC Impedance an average anyhow?

My point of the initial post is theres an obvious difference between the AC Impedance of the rated speaker and the use of DC Resistance in the wire. Even at that it doesnt add up.

In the end its a dumb marketing tactic but it will probably be ok.

Thats the impression I was getting also Bill.

Theres no way to measure AC Impedance in a wire I know of? Isnt AC Impedance an average anyhow?

My point of the initial post is theres an obvious difference between the AC Impedance of the rated speaker and the use of DC Resistance in the wire. Even at that it doesnt add up.

Cant say Ive ever tried to bridge two speakers to a head unit... Thats always been a giant no-no for as long as I can remember.

There is greater resistance with DC over longer runs of wire. look at our cars we have to use 0 gage wire to support 300 amps but the wires coming into our house are wayyy smaller than that.

it doesn't matter if your bridging door speakers your probably not the brightest person in the world. regardless your load is ever changing and most likely wont ever reach your 2 ohm load. So even if you bridge 2 2 ohm speakers to a dcr of 1 ohm your impedance rise is going to be around 4 ohm anyways. you would probalby be fine bridging two for ohm speakers to 2 ohm off your head unit as well, just kind of one of those things. its still better to use the correct dcr for your headunit but most likely you wont have any issues.

What glass is saying is " its like someone thinks that the resistance is a constant that it doesnt change through the system" Correct me if im wrong glass

Bwcad1 wrote:aint gonna matter everything will be fine with them. ryan is that resistance AC or DC? but in the end because of impedance rise and the impedance curve of the speaker the unit will see way higher than 2 anyway.

Im pretty sure when you measure the Ohm of a wire its going to be DC Resistance...

GlassWolf wrote:it's as if someone thinks that circuit impedance is a static in a functioning system or something.

amusing.

Please elaborate, a little :)

I found that quoted paragraph interesting off their website.

If you think it doesnt matter Bill then whats the difference between one of these 2 Ohm speakers and bridging two 4 Ohm speakers?

it's as if someone thinks that circuit impedance is a static in a functioning system or something.

amusing.