How do you know how many watts... - Ranger-Forums - The Ultimate Ford Ranger Resource


Audio & Video Tech General discussion of audio and video for the Ford Ranger.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-29-2008
NMRanger's Avatar
Member
Thread Starter
 
Join Date: Jun 2008
Location: Ruidoso
Posts: 12
How do you know how many watts...

..amp is? I have an amp, I dont know anything about it. When I get home I can get numbers off of it or even pictures of it. Without seeing it or knowing anything about it, is there a way to know how many watts it is?
Reply With Quote
  #2  
Old 06-29-2008
whippersnapper02's Avatar
RF Veteran
iTrader: (1)
 
Join Date: Sep 2006
Location: Earth, Milky Way Galaxy
Posts: 7,415
The only way to really find out is to get the model number and search the web.
Reply With Quote
  #3  
Old 06-29-2008
NMRanger's Avatar
Member
Thread Starter
 
Join Date: Jun 2008
Location: Ruidoso
Posts: 12
k

Thats what I was thinkin, when I get home Ill look for the number. Thanks!
Reply With Quote
  #4  
Old 06-29-2008
NMRanger's Avatar
Member
Thread Starter
 
Join Date: Jun 2008
Location: Ruidoso
Posts: 12
ok...

This is the same one I have. Is it worth using on anything? I just want a sub and know I need an amp too. Someone gave me this one and I have no idea what to do with it. or if it even works. Anyway to test it? Thanks!
Reply With Quote
  #5  
Old 06-29-2008
mmats69's Avatar
Member
 
Join Date: Jan 2008
Location: Montgomery, AL
Posts: 52
take it to a local stereo shop. they should test it for free
Reply With Quote
  #6  
Old 06-30-2008
CBFranger's Avatar
Member
 
Join Date: May 2008
Location: Tampa Bay Area
Posts: 1,029
Quote:
Originally Posted by mmats69 View Post
take it to a local stereo shop. they should test it for free
Testing true RMS power output takes equipment the average shop will not have.

However, if they have an oscilloscope, clamp meter, and DMM they can give you a good ballpark figure. In fact, if you can get a hold of an oscilloscope, clamp meter, and DMM it is pretty easily.
Reply With Quote
  #7  
Old 06-30-2008
seminaryranger's Avatar
Member
 
Join Date: Apr 2006
Location: Ganado, TX
Posts: 356
I once heard that you can get a ballpark figure by taking the fuse rating, multiplying it by 14.4 (voltage, engine running), then mulitplying it by the amplifier's efficiency.

Efficiency is tricky, and it varies by class: A/B or D. I think a good ballpark figure is that class D amps are maybe 70-80% efficient at best, and A/B amps are maybe 60% efficient. Multi-channel amps are usually class A/B and Monoblocks are usually class D.

Example:
My Alpine MRD-605 monoblock is fused for 60A. It's a monoblock and is infact class D. So...
(60x14.4)x0.75 = 648w

This is actually pretty close to the birthsheet which said 631w @ 14.4v

My Audiobahn A6004v 4 channel amp is rated at 600w total rms power. It's fused for 60A, but is a class A/B amplifier. So...
(60x14.4)x0.60 = 518w

This is slightly under rated RMS power, which doesn't surprise me because it didn't come with a birthsheet or a CEA 2006 certification. It's Audiobahn...

This is just a guideline. so take it for with a grain of salt.
Reply With Quote
  #8  
Old 06-30-2008
NMRanger's Avatar
Member
Thread Starter
 
Join Date: Jun 2008
Location: Ruidoso
Posts: 12
Quote:
Originally Posted by seminaryranger View Post
I once heard that you can get a ballpark figure by taking the fuse rating, multiplying it by 14.4 (voltage, engine running), then mulitplying it by the amplifier's efficiency.

Efficiency is tricky, and it varies by class: A/B or D. I think a good ballpark figure is that class D amps are maybe 70-80% efficient at best, and A/B amps are maybe 60% efficient. Multi-channel amps are usually class A/B and Monoblocks are usually class D.

Example:
My Alpine MRD-605 monoblock is fused for 60A. It's a monoblock and is infact class D. So...
(60x14.4)x0.75 = 648w

This is actually pretty close to the birthsheet which said 631w @ 14.4v

My Audiobahn A6004v 4 channel amp is rated at 600w total rms power. It's fused for 60A, but is a class A/B amplifier. So...
(60x14.4)x0.60 = 518w

This is slightly under rated RMS power, which doesn't surprise me because it didn't come with a birthsheet or a CEA 2006 certification. It's Audiobahn...

This is just a guideline. so take it for with a grain of salt.
Oh good god, im going to try reading this one again in the morning when my brain doesn't feel like its gonna explode haha. Thank you though.
Reply With Quote
  #9  
Old 07-01-2008
winks's Avatar
Member
iTrader: (5)
 
Join Date: May 2005
Location: Jackson, New Jersey
Posts: 4,872
Quote:
Originally Posted by NMRanger View Post
Oh good god, im going to try reading this one again in the morning when my brain doesn't feel like its gonna explode haha. Thank you though.
Ha, a quick summary of what Chris said: Multiply the number listed on the fuse by 14.4 and you will have a general rating for your wattage.
Reply With Quote
  #10  
Old 07-01-2008
CBFranger's Avatar
Member
 
Join Date: May 2008
Location: Tampa Bay Area
Posts: 1,029
Quote:
Originally Posted by winks View Post
Ha, a quick summary of what Chris said: Multiply the number listed on the fuse by 14.4 and you will have a general rating for your wattage.
Times efficiency.

It'll put you in the general area...assuming your efficiency guess is semi accurate. For instance, JL's old class D amps were like 50% efficient. On the other hand, there are A/B's that are in the 70% area.

Also, this way assumes the amp is capable of drawing as much current as the rated fuse capacity. However, this is hardly ever true. With cheaper amps, the fuses are usually a good bit above what the amp is capable of pulling with out some sort of failure. On the other hand, many high current amps use slow blow fuses (well some use no fuses at all, lol) so the amps is capable of drawing well over the fuse's rated value for short periods of time.
Reply With Quote
  #11  
Old 07-01-2008
seminaryranger's Avatar
Member
 
Join Date: Apr 2006
Location: Ganado, TX
Posts: 356
So True...

I simply listed a general way to "guess-timate" an amp of unknown wattage. And, you list good info about fusing and efficiency. Good Post.
Reply With Quote
  #12  
Old 07-01-2008
winks's Avatar
Member
iTrader: (5)
 
Join Date: May 2005
Location: Jackson, New Jersey
Posts: 4,872
Teamwork, it's nice when it functions correctly.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Watts Link? chainfire Suspension Tech 19 01-18-2009 01:58 PM
3 Link and watts set up 07Ranger Suspension Tech 34 11-03-2008 08:11 PM
Peak watts. What does it mean? Blackhawk Audio & Video Tech 1 05-30-2008 03:33 PM
600 watts to JL W6v2 0sixsport Audio & Video Tech 16 08-01-2007 07:00 PM
how many watts is a stock 2000 ranger head unit in the eyes of a ranger Audio & Video Tech 5 03-22-2007 08:26 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 04:16 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.