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Replacing 16 Ohm with 8 Ohm Cone Speaker

post #1 of 7
2/9/13 at 6:17am
Thread Starter 
Hello ,

I have a Rocket Series Standing Speaker RS 450, it has dual cone speaker. My dog accidentally tipped over the standing speaker and it fell down and one of the Cone Speaker is sounding distorted - so I guess it has gone bad.

I had a spare cone speaker from the same company that I thought I could use to replace it; but when I opened the defective speaker I found it was a 16 Ohm one and the new spare I had is a 8 Ohm, what should I do ?

1. Is it ok to replace the 16 ohm with 8 ohm one?

2. Only disconnect the defective cone speaker?

3. Just use the new spare 8 Ohm speaker cone alone and disconnect the other 16 ohm one?

Here is the speaker picture :



Thanks.

Manu.
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post #2 of 7
2/9/13 at 7:24am
You can't replace a 16 ohm driver with an 8 ohm, the crossover won't work correctly, which could lead to further damage.
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post #3 of 7
2/9/13 at 7:36am
Quote:
Originally Posted by icemanu View Post

Hello ,

I have a Rocket Series Standing Speaker RS 450, it has dual cone speaker. My dog accidentally tipped over the standing speaker and it fell down and one of the Cone Speaker is sounding distorted - so I guess it has gone bad.

Most likely fault - a rubbing voice coil.
Quote:
I had a spare cone speaker from the same company that I thought I could use to replace it; but when I opened the defective speaker I found it was a 16 Ohm one and the new spare I had is a 8 Ohm, what should I do ?

Obtain the correct replacement from the manufacturer.
Quote:
1. Is it ok to replace the 16 ohm with 8 ohm one?

Usually this is a really bad idea.

(1) The 8 ohm driver will play louder than the 16 ohm driver , all other things being equal.

(2) If there is a crossover for the woofer, its response will be dramatically shifted by the lower impedance driver and the result will usually be a hole in the response curve.

(3) Since there seem to be two identical drivers, it is likely that the 16 ohm driver was chosen with the idea of two 16 ohm drivers in parallel = 8 ohms. That is consistent with a 8 ohm speaker system. If you parallel a 8 ohm and a 16 ohm the resultant impedance is more like 5.3 ohms which means that your speaker stops being an 8 ohm speaker. Your amp will probably be pretty happy either way, but no guarantees.

At this point I would say that your best work-around until the new 16 ohm driver shows up would be to disconnect and remove both bass drivers, block the hole for one of them with a board, and install the 8 ohm driver all by itself.

Putting in the 8 ohm driver in addition to the 16 ohm that is there will probably not ruin the system totally, but it is only good as a temporary work-around.
Quote:
2. Only disconnect the defective cone speaker?

It will upset the tuning of the enclosure. It is an OK temporary work-around.
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A reasonble short term work-around only.

On a temporary basis only.
Quote:
3. Just use the new spare 8 Ohm speaker cone alone and disconnect the other 16 ohm one?

Not a good permanent move.
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post #4 of 7
2/9/13 at 9:03am
Thread Starter 
Thanks for the detailed reply. My dilemma is the Company AV123 doesn't exist anymore. So I don't know where to get a similar replacement.

If it is a rubbing coil issue. Can it be fixed.

I am trying to look for a good permanent fix....

My amplifier is Pioneer Sc07.


The spare speaker I had was for my front big standing speaker RS850.
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post #5 of 7
2/9/13 at 10:27am
Quote:
Originally Posted by icemanu View Post

Thanks for the detailed reply. My dilemma is the Company AV123 doesn't exist anymore. So I don't know where to get a similar replacement.
I doubt they made their own drivers. Identify it and you should be able to find another from the manufacturer.
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post #6 of 7
2/9/13 at 12:01pm
Quote:
Originally Posted by icemanu View Post

Thanks for the detailed reply. My dilemma is the Company AV123 doesn't exist anymore. So I don't know where to get a similar replacement.

Can it be fixed.


If it is a rubbing coil issue, you would have to find a company that really rebuilds speakers, and doesn't just a surround replacement.

I have another idea. Put an 8 ohm resistor in series with the 8 ohm driver and install it. You would need a power resistors - 20 watts or so to be safe.

That will keep the crossover and your amp happy, and there will only be a dB or two loss in bass output.
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post #7 of 7
2/9/13 at 1:00pm
Thread Starter 
Quote:
Originally Posted by arnyk View Post

If it is a rubbing coil issue, you would have to find a company that really rebuilds speakers, and doesn't just a surround replacement.

I have another idea. Put an 8 ohm resistor in series with the 8 ohm driver and install it. You would need a power resistors - 20 watts or so to be safe.

That will keep the crossover and your amp happy, and there will only be a dB or two loss in bass output.

Thanks for the suggestion. I will try to look for 8 ohm resistor.

I am using the RS450 speaker as rear speaker. Maybe, I might as well use it as surround back speaker and use ELT 525 Monitor for Rear speaker. I am not sure if it is a good idea though

RS450 Specs :

System: 2-way, three-driver direct-radiating system, vented enclosure with two rear-firing flared ports.
Drivers: Vifa Ring Radiator tweeter, two custom 5.25" long-throw mid-woofers
Frequency Response: ±1.35db 200Hz to 20KHz; ± 3 dB 38 Hz to 20 KHz
Crossover Point: 2.5kHz
Slope: 12dB acoustic
Impedance: 8 Ohms nominal
Efficiency: 87dB (@ 1 watt / 1 meter)

ELT525 Specs ;

ELT525 Monitor
System Description: 2 Way
Woofer: 5.25” treated paper cone
Tweeter: 1” fabric dome with oversized surround
Enclosure Type: Vented, Rear Firing
Frequency Response (+/-3dB): 60Hz- 20KHz
Nominal Impedance: 8 Ohms
Sensitivity: 83dB @ 1w/1m
Crossover: 2200Hz, 2nd Order Acoustic

Thanks.
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