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calculating what amp i need


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fiat1980spyder 
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Joined: February 17, 2010
Location: New York, United States
Posted: November 03, 2011 at 8:37 PM / IP Logged  
I have a 1980 Fiat spider convertible. While the top was down I always had a a problem hearing the speakers since they were placed on the corners near my feet so i made a custom box and installed Alpine type R components in the box and the tweeters a bit higher, Initially i had a Boss 800Watt amp from a friend but that eneded up burning out so now I need to get another amp and wanted to know that size amp to get.
The deck is a Sony CDX-S2000-Specs.
http://www......com/item_1929_Sony-CDX-S2000.html
Speakers Alpine Type-R SPR-17LP-Specs.
http://www.crutchfield.com/S-ZC4Gq8qOnvq/p_500SPR17LP/Alpine-Type-R-SPR-17LP.html
Car had a 65Amp alternator
Is there some type of calculation?
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: November 05, 2011 at 11:26 AM / IP Logged  
Here's the method I use.  First, calculate how much money you can spend.  Decide how many output channels you require (if it's for subs, usually that means mono.)  Decide how low a load it must handle (how are you wiring the subs?)  Then, ignore all the low-end brands (like Boss. Crunch, etc) and purchase the best amp you can possibly afford from a good quality manufacturer (like Alpine, JBL, JL Audio, etc.) ignoring things like power rating.  Install it properly.  Rock and roll.
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fiat1980spyder 
Member - Posts: 37
Member spacespace
Joined: February 17, 2010
Location: New York, United States
Posted: November 06, 2011 at 10:14 AM / IP Logged  
In terms of load how would I find that? This is for component speakers no subs.
Saids
RMS range is 2-50watts
RMS max is 250
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: November 06, 2011 at 11:08 PM / IP Logged  
What's the impedance of each set?  4-ohms?  2-ohms?  That's the load it places on the amp.
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fiat1980spyder 
Member - Posts: 37
Member spacespace
Joined: February 17, 2010
Location: New York, United States
Posted: November 07, 2011 at 3:02 PM / IP Logged  
4 ohms
Sensitivity: 87 dB at 1 watt
Frequency Response: 35 - 30k Hz
RMS Power Range (Watts):2-50
Peak Power Handling (Watts):250
Impedance (Ohms):4
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: November 07, 2011 at 7:42 PM / IP Logged  
50 watts per channel @ 4-ohms.
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fiat1980spyder 
Member - Posts: 37
Member spacespace
Joined: February 17, 2010
Location: New York, United States
Posted: November 08, 2011 at 1:51 PM / IP Logged  
you figured that by the range??
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: November 08, 2011 at 4:30 PM / IP Logged  
You said the speakers are 4-ohms and are rated at 50 watts RMS.  That's all you need to know.
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