[SOT] Testing Speakers

[rocco.crossing at gmail.com (Rhett Farnum)]

John you do have the placements correct for the components. I'm not sure on
the phasing but I will go along with it for now. although I do agree with
testing things one by one like TBerk said. BTW welcome back T not sure if I
jumped on on that thread or not. Good luck Brad.
 Rhett

 On 10/5/05, John Gates <gatesj@mailblocks.com> wrote:
>
> I'm fairly sure I remember that a high pass passive crossover contains
> capacitors inline with the speaker and inductance coils in parallel
> with the speaker for high pass. I believe it's just the opposite for
> low pass, coils inline and caps across. A 6db/oct crossover would
> simply have a cap or coil inline. A 12db/oct crossover would have the
> cap or coil and then the opposite component on the speaker side of that
> first component, e.g. a cap inline on the amp side and then a coil
> across toward the speaker from the cap. Polarity is reversed however
> through that setup. Only an odd number of components retains polarity
> IIRC, i.e. an 18db/oct setup is one component inline, then the other
> type of component across, then the first type of component inline
> again, this is the favored setup.
>
> Of course we're talking about passive crossovers here also.
>
> Therefore, low pass would show continuity but high pass would not.
>
> Or I could be completely wrong on this, It's completely from memory.
>
> John Gates
> --
> '97 Jetta GLX
> '85 Scirocco
>
> -----Original Message-----
> From: T Berk <bayareaberk@yahoo.com>
> To: Brad Sterling <bgsterling@bluebottle.com>; scirocco-l@scirocco.org
> Sent: Wed, 5 Oct 2005 12:24:53 -0700 (PDT)
> Subject: Re: [SOT] Testing Speakers
>
> --- Brad Sterling <bgsterling@bluebottle.com> wrote:
> <A story of failing stereo (re)installation>
>
>
> Divide and conquer my friend. Swap the Left for the
> Right components, one at a time until you have
> revealed the trouble;
>
> - Temporarily swap the leads from the Head Unit, Left
> for Right. Does the problem follow or remain on that
> same side?
>
> - Swap a speaker at the end of the chain, does the
> problem follow? (btw, a 9v battery makes for a decent
> speaker verify-er: it's got enough juice to push or
> pull the 'cone' one way or the other.) Great for
> verifying Phase also. (As in having all your speakers
> pushing 'out' together vs fighting each other.
>
> - Bypass the x-over, just on low power, and see if the
> Head Unit to Speaker connections are OK.
>
> All of these check basic function. If you want to
> break out the meter you are going to want to check
> Voltage w/ the power ON and Continuity (and/or
> Resistance [or lack there of]) w/ the Power OFF.
>
> Off the top of my head checking for Cont through a
> x-over should work but running signal down the thing
> sounds like a win/win to me.
>
>
> hth,
> TBerk
>
>
>
>
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