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  #1 (permalink)  
Old 30 Jun 2007, 04:58 am
Hachiroku ハチロク
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Default Speaker-Eating dashboard?

My Mazda 626 seems to have an appetite for speakers.
I have replaced the passenger's side front speaker for the third time a
couple weeks ago, and already it's buzzing like a bee is trapped in it.

The speakers installed are capable of MORE than the rated wattage of the
JVC Cd player (~22 Watts per channel, speakers are 50W or more)
All the other speakers work great, including the Driver's side dash
replaced in January as a set with the one that went bad a couple weeks ago.

There aren't any leaks, there doesn't appear to be any 'stray magentism'
anywhere around, no obstructions or protrusions of any type into the
speaker area.

I'm out of 'inexpensive' speakers (the last one that blew was a Clarion,
not the most expensive, but not a cheapo by any means...) Connections are
tight.

Usually audio problems don't throw me, but this one has me stumped.

Any ideas?

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  #2 (permalink)  
Old 30 Jun 2007, 05:20 am
Art
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Posts: n/a
Default Re: Speaker-Eating dashboard?

Find a cheap speaker, hook if up electrically but don't install it
physically. Just extend the wires and leave it somewhere in the car to
figure out whether it is related to the physical installation or a short
from the radio.


"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:wPphi.70$bh5.29@trndny01...
> My Mazda 626 seems to have an appetite for speakers.
> I have replaced the passenger's side front speaker for the third time a
> couple weeks ago, and already it's buzzing like a bee is trapped in it.
>
> The speakers installed are capable of MORE than the rated wattage of the
> JVC Cd player (~22 Watts per channel, speakers are 50W or more)
> All the other speakers work great, including the Driver's side dash
> replaced in January as a set with the one that went bad a couple weeks
> ago.
>
> There aren't any leaks, there doesn't appear to be any 'stray magentism'
> anywhere around, no obstructions or protrusions of any type into the
> speaker area.
>
> I'm out of 'inexpensive' speakers (the last one that blew was a Clarion,
> not the most expensive, but not a cheapo by any means...) Connections are
> tight.
>
> Usually audio problems don't throw me, but this one has me stumped.
>
> Any ideas?
>



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  #3 (permalink)  
Old 30 Jun 2007, 06:25 am
larry moe 'n curly
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Default Re: Speaker-Eating dashboard?

Hachiroku wrote:

> My Mazda 626 seems to have an appetite for speakers.
> I have replaced the passenger's side front speaker for the third time a
> couple weeks ago, and already it's buzzing like a bee is trapped in it.


> The speakers installed are capable of MORE than the rated wattage of the
> JVC Cd player (~22 Watts per channel, speakers are 50W or more)


50W continuous? I have some 2' tall floor speakers rated for 50W
music power but only 1W continous (instructions said not to exceed 8V,
peak-to-peak, for more than 2-3 minutes).

> All the other speakers work great, including the Driver's side dash
> replaced in January as a set with the one that went bad a couple weeks ago.
>
> There aren't any leaks, there doesn't appear to be any 'stray magentism'
> anywhere around, no obstructions or protrusions of any type into the
> speaker area.
>
> I'm out of 'inexpensive' speakers (the last one that blew was a Clarion,
> not the most expensive, but not a cheapo by any means...) Connections are
> tight.


If you don't blast them at high power all day, about the only
electrical thing that usually ruins speakers in a hurry is DC from the
amplifier. Switch a digital voltage meter to read DC volts and see if
there's more than about 0.1Vdc across the amp terminals (an analog
meter won't work for this). Don't measure to chassis ground because I
think that most car stereos now use two floating outputs (an easy way
to get higher power without higher power supply voltage).

Have you tried pressing the speaker cone to see that it moves in and
out without binding? Some of my Ford factory speakers (base audio
system) that scraped the magnet when moved also buzzed, but I had a
Ford radio cause a buzz because of some power supply problem (I think
it was the power supply that drove the LCD).

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  #4 (permalink)  
Old 30 Jun 2007, 08:36 am
David
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Default Re: Speaker-Eating dashboard?

On Sat, 30 Jun 2007 09:58:52 GMT, Hachiroku ???? <Trueno@AE86.gts>
wrote:


>
>The speakers installed are capable of MORE than the rated wattage of the
>JVC Cd player (~22 Watts per channel, speakers are 50W or more)
>All the other speakers work great, including the Driver's side dash
>replaced in January as a set with the one that went bad a couple weeks ago.
>

You need more power. A good rule of thumb is that the amp should be
rated at 2 times the speaker rating. This prevents clipping which
speakers apaprt.
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  #5 (permalink)  
Old 30 Jun 2007, 09:17 am
Smitty Two
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Posts: n/a
Default Re: Speaker-Eating dashboard?

In article <igqc83hbo4bcs8h50hs1lhj4jrqumovaa6@4ax.com>,
David <rickets@knac.com> wrote:

> On Sat, 30 Jun 2007 09:58:52 GMT, Hachiroku ???? <Trueno@AE86.gts>
> wrote:
>
>
> >
> >The speakers installed are capable of MORE than the rated wattage of the
> >JVC Cd player (~22 Watts per channel, speakers are 50W or more)
> >All the other speakers work great, including the Driver's side dash
> >replaced in January as a set with the one that went bad a couple weeks ago.
> >

> You need more power. A good rule of thumb is that the amp should be
> rated at 2 times the speaker rating. This prevents clipping which
> speakers apaprt.


you sure about that? it's true that distortion tears up speakers, and an
underpowered amp can lead people to crank the volume up beyond clipping,
but i've never heard it suggested that the amp be rated for more power
than the speakers.
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  #6 (permalink)  
Old 30 Jun 2007, 09:20 am
EdV
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Posts: n/a
Default Re: Speaker-Eating dashboard?

If the one side is failing, swap the good and bad speakers. does the
bad speaker become good? and the good speaker turn bad? is the stereo
properly grounded?

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  #7 (permalink)  
Old 30 Jun 2007, 10:05 am
JoeSpareBedroom
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Posts: n/a
Default Re: Speaker-Eating dashboard?

"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:wPphi.70$bh5.29@trndny01...
> My Mazda 626 seems to have an appetite for speakers.
> I have replaced the passenger's side front speaker for the third time a
> couple weeks ago, and already it's buzzing like a bee is trapped in it.
>
> The speakers installed are capable of MORE than the rated wattage of the
> JVC Cd player (~22 Watts per channel, speakers are 50W or more)
> All the other speakers work great, including the Driver's side dash
> replaced in January as a set with the one that went bad a couple weeks
> ago.
>
> There aren't any leaks, there doesn't appear to be any 'stray magentism'
> anywhere around, no obstructions or protrusions of any type into the
> speaker area.
>
> I'm out of 'inexpensive' speakers (the last one that blew was a Clarion,
> not the most expensive, but not a cheapo by any means...) Connections are
> tight.
>
> Usually audio problems don't throw me, but this one has me stumped.
>
> Any ideas?
>


What size are these speakers?


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  #8 (permalink)  
Old 30 Jun 2007, 05:36 pm
David Coggins
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Posts: n/a
Default Re: Speaker-Eating dashboard?


"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:wPphi.70$bh5.29@trndny01...
> My Mazda 626 seems to have an appetite for speakers.
> I have replaced the passenger's side front speaker for the third time a
> couple weeks ago, and already it's buzzing like a bee is trapped in it.


Any chance that the speaker mounting area could be distorted, which might be
pulling the speaker frame out of alignment and causing the cone voice coil
to rub on the magnet gap?? Maybe some old accident damage? Just a thought.

Dave


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  #9 (permalink)  
Old 30 Jun 2007, 05:57 pm
Bonehenge (B A R R Y)
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Posts: n/a
Default Re: Speaker-Eating dashboard?

On Sat, 30 Jun 2007 07:17:59 -0700, Smitty Two
<prestwhich@earthlink.net> wrote:

>but i've never heard it suggested that the amp be rated for more power
>than the speakers.


Very, very common in the high-end and pro audio worlds.

You get two bonuses. Headroom, which can do wonders for clarity, and
no clipping which prevents your speakers from dealing with DC.

There's not much that speakers hate more than DC, which happens to be
0 Hz. (drive it all the way in or out and hold it there!) except maybe
water. <G>
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  #10 (permalink)  
Old 30 Jun 2007, 06:46 pm
David
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Posts: n/a
Default Re: Speaker-Eating dashboard?

On Sun, 1 Jul 2007 08:36:48 +1000, "David Coggins"
<spamfree@spamfree.com> wrote:

>
>"Hachiroku ????" <Trueno@AE86.gts> wrote in message
>news:wPphi.70$bh5.29@trndny01...
>> My Mazda 626 seems to have an appetite for speakers.
>> I have replaced the passenger's side front speaker for the third time a
>> couple weeks ago, and already it's buzzing like a bee is trapped in it.

>
>Any chance that the speaker mounting area could be distorted, which might be
>pulling the speaker frame out of alignment and causing the cone voice coil
>to rub on the magnet gap?? Maybe some old accident damage? Just a thought.
>
>Dave
>

If they're pressed metal frames and you overtorque the mounting screws
they almost always warp.
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