10 replies to this topic

[koss]

I have a job to do on an ice cream van basically making a new chimes system.

3 foot long pa horn with a 100 watt compresion driver on the end it is 8 ohms

will a car type amp be ok for this and what ohms do they run at.

Thanks koss.

[Bungle]

car amps run at 4 ohms

household hifi equipment runs at 8 ohms

but two 8 ohms speakers wired in parallel make 4 ohms if that helps

[koss]

Cheers bungle

Additional Information about Pioneer GM-X362 Car Audio Amplifier

Key Features
Amplifier Type Multi Channels
Bridgable Bridgable
RMS Power at 4 Ohms 40 W x 2 + Sub
RMS Power at 2 Ohms 50 W x 2 + Sub

Performance
Frequency Response 10 Hz - 50000 Hz
Signal to Noise Ratio 100 dB
THD at Rated RMS Power 0.08 %

Crossover / Equalizer
Bass Boost Without Bass Boost
Low - Pass Frequency 80 Hz - 80 Hz

Other Features
Input Voltage 10.8 volt
MOSFET Circuitry Yes
3 Way Ready Yes

Dimensions
Height 6 cm
Width 27.9 cm
Depth 15.6 cm

i have just bought this amp maybe to run in brige mode

will i do any damage or is the amp big enough

tho old system was 25 watt with 16 ohms

i want it loud, but not so loud to upset the regional chime squad

Edited by koss, 19 January 2007 - 02:22 PM.

[nmt_oli]

Unfortunately it will be a little underpowered, but shoudl be ok, just make sure you don't clip the signal, that would damge it.

If the impedance of the driver is greater than that of the amplifier, then that is safe, but the amplifier will not be able to provide as much power.

[koss]

Unfortunately it will be a little underpowered, but shoudl be ok, just make sure you don't clip the signal, that would damge it.

If the impedance of the driver is greater than that of the amplifier, then that is safe, but the amplifier will not be able to provide as much power.

Haway ice doctors show me the way to go, its getting done on monday if i need to buy more gear lets here it.

[edjohnson]

not all car amps are four ohms

and not all home hifi kit is 8 ohms

and not all pa kit is any ohmage

all stuff is interchangable, wired and chosen correwctly for the best situation.

Just use a powerful car amp and you will be fine

wiring two 8 ohm speakers in parallel would produce a 4 ohm load for an amp

wiring two 4 ohm speakers in series would give a 8 ohm load

amps desingned to run at any ohmage, will run better, longer, and more reliably at a higher ohmage

go for a more powerful amp than you think you need, run at a lower gain setting, and a higher ohmage and the amp wont clip, overheat, or fail as soon

ed

[koss]

Cheers i will sort it on monday. Just dont want him comming back saying its no good after a week.

still looking for more info

[koss]

Bought a 150 watt rms 8 ohm compression driver 1" 3/8
Received the amp won on ebay and reading through the book it can run 4 to 8 ohms anyway.
I wired it to a battery and wired the pa horn in bridged mode, according to the book it gives 200watts this way.
I don't intend to run it full power and may wire it on one channel.
The test run was hilarious
Wired every thing up and powered it up. I didn't have the chimes mechanism with me, its like a wind up music box with a pick up coil on it. So I decided to improvise and cut off one of the earphones off a hands free kit and wire it to the rca input.
I think I have set a new world record for the loudest mobile phone ring. The nokia tune of course. I should make a vid and post it on youtube. People looking out of windows,dogs barking and kids crying.
Bearing in mind the ice cream man only had 25 watts I think its a good result . People will need triple glazing now.

[Bungle]

Koss's new toy has given him the horn

[koss]

Koss's new toy has given him the horn

Did you here it at Cornwall bungle

[Bungle]

not over mrs bungles snoring