stereo system hookup help
Moderator: F9K9
stereo system hookup help
okay
so i have some speakers that were made for a home system.
but i want to use them in with a car amp.
i was told that most home speakers are 8ohm and that if i did it, i would have to wire it up a speacial way.
i dont know nothing about no "ohm"
here's the specs
speakers can handle 40watt. thats what the box says and nothin else
my amp is a 4 channel 300 watt amp that has 75 watts per channel.
help?
so i have some speakers that were made for a home system.
but i want to use them in with a car amp.
i was told that most home speakers are 8ohm and that if i did it, i would have to wire it up a speacial way.
i dont know nothing about no "ohm"
here's the specs
speakers can handle 40watt. thats what the box says and nothin else
my amp is a 4 channel 300 watt amp that has 75 watts per channel.
help?
[size=75] -HOBIE
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- 04crewvt
- Crew K Elite
- Posts: 1465
- Joined: Sat Oct 22, 2005 8:24 am
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Those speakers won't work well for you, their max input power is 40 watt that is normally the continuous rating or how much power can constantly be applied, peak power for transient spikes should be double that for brief periods. Your amp is sending out more power than the speakers can handle. If you did convert them to 4ohm which is what most auto speakers run you would be putting even more stress on them. They would work until you cranked it up and then they would fry. Better off matching speakers designed for car audio with the correct ohmage and wattage to match your amplifiers output.
[size=75]Why does the universe decree that if you have all the time in the world to work on projects you have no money and vice versa?
Green 2004 ZR-5 w/ too much to list here: http://www.cardomain.com/ride/2296465[/size]
Green 2004 ZR-5 w/ too much to list here: http://www.cardomain.com/ride/2296465[/size]
On the contrary the speakers will work just fine. The amp is rated for 75 watts per channel with a 4 ohm load. If you are using an 8 ohm speaker then the power to the load will be cut in half compared to the 4 ohm speaker. You will end up with 37.5 watts per channel at 8 ohms.
If there are any other EE's out there feel free to check my math.
Using Ohms law
V = I * R and Power = I^2 * R
Now solve for the voltage across the speaker
(75 watts with a 4 ohm load)
V = sqrt(P * R)
(75W * 4ohm)^.5 = 17.32V
And using (V / R = I)
17.44V / 8ohm = 2.18A
Substitute the new speaker load 8 ohms and find
the new power delivered to the load
(P = I^2 * R) yields
2.18A^2 * 8ohm = ~38watts
All in all the new speakers will work fine...the question is how will they look?
If there are any other EE's out there feel free to check my math.
Using Ohms law
V = I * R and Power = I^2 * R
Now solve for the voltage across the speaker
(75 watts with a 4 ohm load)
V = sqrt(P * R)
(75W * 4ohm)^.5 = 17.32V
And using (V / R = I)
17.44V / 8ohm = 2.18A
Substitute the new speaker load 8 ohms and find
the new power delivered to the load
(P = I^2 * R) yields
2.18A^2 * 8ohm = ~38watts
All in all the new speakers will work fine...the question is how will they look?
2003 S10 Crew 4x4
Mods: 1.5" Front Spacers - GM Valley Hitch - WeatherTech WeatherFlectors - Bilstein Shocks - Boise Spring works 2" rear spring kit - Truxedo Toneau Cover - PopLock tailgate lock - Hypertech Tuning - SKIDS Flares - 2" Body Lift - ZR2 Axle upgrade
Mods: 1.5" Front Spacers - GM Valley Hitch - WeatherTech WeatherFlectors - Bilstein Shocks - Boise Spring works 2" rear spring kit - Truxedo Toneau Cover - PopLock tailgate lock - Hypertech Tuning - SKIDS Flares - 2" Body Lift - ZR2 Axle upgrade
They'll look great sitting on the rear deck of his car.ludwis wrote:All in all the new speakers will work fine...the question is how will they look?
[size=75]Mark
[b][i][color=red]2004 Dodge Ram 1500 4x4 Quad Cab[/color][/i][/b]
[b][color=blue]"There are no stupid questions, just stupid people."[/color][/b][/size]
[b][i][color=red]2004 Dodge Ram 1500 4x4 Quad Cab[/color][/i][/b]
[b][color=blue]"There are no stupid questions, just stupid people."[/color][/b][/size]
ding ding ding. we have a winner. yall are all concerned with watts and dont think about the ohms.ludwis wrote:On the contrary the speakers will work just fine. The amp is rated for 75 watts per channel with a 4 ohm load. If you are using an 8 ohm speaker then the power to the load will be cut in half compared to the 4 ohm speaker. You will end up with 37.5 watts per channel at 8 ohms.
If there are any other EE's out there feel free to check my math.
Using Ohms law
V = I * R and Power = I^2 * R
Now solve for the voltage across the speaker
(75 watts with a 4 ohm load)
V = sqrt(P * R)
(75W * 4ohm)^.5 = 17.32V
And using (V / R = I)
17.44V / 8ohm = 2.18A
Substitute the new speaker load 8 ohms and find
the new power delivered to the load
(P = I^2 * R) yields
2.18A^2 * 8ohm = ~38watts
All in all the new speakers will work fine...the question is how will they look?
btw, its not about doing it right. but thanks for your opinion, lol.
and also they cant fly off the rear deck when i hit the breaks. cuz there is no rear deck and they are mounted to the upper back tube accross the back of my seats.
as far as how they look. i laready have them mounted and they look great. they are outdoor speakers so they came with a hanging mount and they have their own plastic boxes thats all weather resistant. hopefully they work good. i will post pics when i finish up the rig in a few weeks.
[size=75] -HOBIE
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| ##Budweiser ###### | ||''|"\,__.
|_...__...________ ====| |__|__|...]
"(@)'(@)""""**|(@)(@)******(@)I[/size]
^^^^^^^^^^^^^^^^^| ||__\
| ##Budweiser ###### | ||''|"\,__.
|_...__...________ ====| |__|__|...]
"(@)'(@)""""**|(@)(@)******(@)I[/size]