Quadra 700 Speaker.. specs?

[Tarantulas]

Does anyone know the exact specifications of the Quadra 700 speaker (Ohms, Wattage, physical dimensions)?

People seem to think it's the same as the IIcx or IIci speaker, but it's not.  

Thanks!

 

[Bolle]

IIci is 8ohms and 0.5W with a 9cm*6cm chassis.

Not what you have been looking for but if someone has a Q700 speaker we have at least something to compare it to

 

[Professor 362]

Does anyone know the exact specifications of the Quadra 700 speaker (Ohms, Wattage, physical dimensions)?

People seem to think it's the same as the IIcx or IIci speaker, but it's not.

Thanks!

Hello Tarantulas. Did you ever figure this out? I am looking for a speaker assembly my Quadra 700. I bought it used and the whole assembly is missing. I see several assemblies on eBay and they always say for IIci, IIcx and Q700. But my Q700 board has 3 pins, and the plugs on the advertised speakers only have 2. Yet they do look the same overall, but I have serious concerns about placing that order and trying to choose which 2 pins to use! Thanks so much for your time.

 

[pizzigri]

86x57mm, only two corner leads are connected, central is not. see mage for rest of info.

 

[Phipli]

IIci is 8ohms and 0.5W with a 9cm*6cm chassis.

Not what you have been looking for but if someone has a Q700 speaker we have at least something to compare it to

Erm I'm pretty sure the IIci is 32ohm? Have you got the wrong speaker in a IIci?

 

[Phipli]

Folks, we need to get this right because getting it wrong will burn out the sound circuit on someone's computer.

Can people physically check what impedance the speaker is in their IIcx, IIci and Q700?

I only have a IIci that I've owned long enough to know hasn't had its speaker swapped, I'll have a glance in it later.

 

[volvo242gt]

I'll have to check later today.

Maybe @Mk.558 can check the machines he got last weekend as well, since he has both a IIci and a 700...

 

[pizzigri]

The speaker in my 700 is painfully original!

 

[jmacz]

I just tested on various machines I have:

IIci #1 (2pin speaker/Regal/Taiwan): meter reads 30.8 ohms, label on the back says it's a 32ohm/0.5W.
IIci #2 (2pin speaker/Regal/Taiwan): meter reads 30.9 ohms, label on the back says it's a 32ohm/0.5W.
Quadra 700 (3pin speaker/Regal/Taiwan): meter reads 7.9 ohms, label on the back says it's an 8ohm/0.5W.

 

[Phipli]

I just tested on various machines I have:

IIci #1 (2pin speaker/Regal/Taiwan): meter reads 30.8 ohms, label on the back says it's a 32ohm/0.5W.
IIci #2 (2pin speaker/Regal/Taiwan): meter reads 30.9 ohms, label on the back says it's a 32ohm/0.5W.
Quadra 700 (3pin speaker/Regal/Taiwan): meter reads 7.9 ohms, label on the back says it's an 8ohm/0.5W.

Just to clarify (you might know), but the number on back of the magnet is the impedance, and you're measuring the resistance. There is always a bit of difference between these two values, but the resistance is a good ballpark.

Thanks for the measurements!

 

[Professor 362]

I really appreciate everyones's input. I was about to buy a IIci speaker module on eBay, but I paused to research when I noticed a 2-pin plug in the photo... compared to a 3-pin connection on my Quadra 700 logic board. (logic board comparison photos attached). I was confused by this and figured I might just try to slip the 2-pin plug over 2 of the Q700 pins to see what happened... if nothing, perhaps then move over to the other 2 pins. But Phipli pointed out that this could compromise my sound circuit. Glad I did not experiment with it. But even though the modules look identical, the plugs reveal the difference. I supposed I will have to keep looking until I see a module with the 3-pin plug on the speaker. I've never even seen a 3-pin plug. I have looked for photos of the inside of Quadra 700 machines and noticed that it appears that there are only 2 speaker wires going to the 3-terminal plug. Confusing.

 

[Professor 362]

Oh, and here are clippings from a Quadra 700 take down video I found on Youtube. It shows just two wires going to that 3-terminal plug. Perhaps someone with a Quadra 700 could tell me which of the 3 board pins is not used. Please let me know if anyone has a Quadra 700 speaker they wish to sell!. (and thanks for all the help... may have saved my logic board!)

 

[pizzigri]

...as I noted in my post, the two wires go to pin 1 and 3, the middle one is not used. At least, in my Quadra700

 

[Phipli]

But Phipli pointed out that this could compromise my sound circuit.

Just a quick thing - too higher resistance won't kill the circuit, it will just be quiet because the current and power will be lower, so a 32ohm speaker in your Quadra would just be much quieter than it should be.

@Bolle's setup, with an 8ohm speaker in a IIci instead of a 32ohm speaker is much more worrying as this will result in four times the current attempting to be sourced from the sound circuit.

@Professor 362 : you're very lucky though, 8ohm speakers are the most common type, so a replacement will be probably not too bad to find. You want one that matches or exceeds the power (0.5w or more) and matches the impedance (8ohm). Good luck!

 

[Professor 362]

...as I noted in my post, the two wires go to pin 1 and 3, the middle one is not used. At least, in my Quadra700

My apologies... I was not clear on your earlier response re corner pins. Now I am with you.

 

[Professor 362]

Just a quick thing - too higher resistance won't kill the circuit, it will just be quiet because the current and power will be lower, so a 32ohm speaker in your Quadra would just be much quieter than it should be.

@Bolle's setup, with an 8ohm speaker in a IIci instead of a 32ohm speaker is much more worrying as this will result in four times the current attempting to be sourced from the sound circuit.

@Professor 362 : you're very lucky though, 8ohm speakers are the most common type, so a replacement will be probably not too bad to find. You want one that matches or exceeds the power (0.5w or more) and matches the impedance (8ohm). Good luck!

Thanks for easing my mind on the impedance issue being in my favor, safety wise. Is polarity critical, should I mock up a speaker from another source?

 

[Phipli]

Thanks for easing my mind on the impedance issue being in my favor, safety wise. Is polarity critical, should I mock up a speaker from another source?

Polarity doesn't matter much in this instance. There is a right and a wrong way, but it doesn't make any important difference. It's more critical if you have stereo because if you get it wrong then, the sound cancels out.

 

[nekonoko]

I bought a Q700 in a IIci case a few months back and the solution they'd used was to bend the middle pin off to the side and the two outer pins closer together so they could jam the IIci speaker connector directly onto the board without modifying it. One of my restoration steps was to carefully straighten the speaker pins and install a proper 3 pin molex on the speaker wire. The IIci speaker I have is also 32ohm/0.5W as stated earlier but works well enough on the Q700.

 

[Mk.558]

I have a LCR meter in the mail that should be able to measure the impedance. Dunno when it'll show up though.

The inscription on the Q700 speaker reads the same as jmacz's post.

 

[Phipli]

I have a LCR meter in the mail that should be able to measure the impedance. Dunno when it'll show up though.

The inscription on the Q700 speaker reads the same as jmacz's post.

It's unlikely to have changed from manufacture. Unless it's actually failing and has a short in it. They're just a coil of enameled wire.