Neil Green wrote:
>>>> One other thing you want to check is the speaker
>>>> phase - make sure both + terminals in the wiring
>>>> are connected to the appropriate + terminal on
>>>> each speaker. If the speakers are out of phase
>>>> with each other (+/- reversed), the two cones will
>>>> be working against each other and canceling bass
>>>> that way.
>>> Checked that with a meter, all OK.
>> A meter won't tell you if the polarity is right.
>
> Mine does.
> A minus sign displays if the polarity is wrong as you
> measure the voltage.
> All OK.
Umm... what voltage are you measuring?
The signal coming out of the deck is AC; the signal phase has to be the
same in both speakers. There is no "right" or "wrong" polarity as such,
they just have to be the same. A DC meter won't give you a meaningful
reading.
>> Is this car running the stock deck as well, or is it
>> an aftermarket deck?
>
> The stock deck was a cassette player (it's a '92 model
> car).
> We put a Pioneer head unit in, can't remember the
> model but all the reviews were good.
That makes it a little easier then, because you can check the polarity
of the connections to the deck, then confirm them at the speaker end.
If you used the factory speaker wiring, just follow the wiring color
codes and make sure the + and - outputs on the deck properly match the
terminals on the speakers.
>> A basic sealed box with an 8" sub will give him nice
>> clean bottom end without need of massive amounts of
>> amp power. The bass can then be filtered out of the
>> 6s.
>
> No room for a sub I'm afraid, he'll have to live with
> less bass or maybe beef up the 7 x 5's in the front
> doors and fade more to the front.
> Either way he'll have to live with the limitations of
> the system.
> Thanks very much for your time.
There's always room for a sub :) Build a baffle out of 3/4" MDF, put it
behind the back seat, and mount a freeair sub in it, no box required :)
5x7s won't give you significantly more bass than 6" rounds, BTW. Bass
response is a factor of the amount of air moved, and that has two
factors when it comes to the speakers: cone surface area, and excursion.
Not accounting for the tapered shape of the cone itself or differences
in surround width, a 5x7 speaker nominally has about 27.5 sq. in. of
surface area; a 6.5" round speaker has 44 sq. in. of surface area. In
other words, excursion notwithstanding, a 6.5" round speaker moves
almost twice as much as a 5x7.
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