General SPL General discussion of Sound Pressure Level topics.

brute power or line drive?

Old 02-22-2011, 07:23 PM
  #1  
50 Watt CAFz'r
Thread Starter
 
Join Date: Aug 2010
Posts: 77
brute power or line drive?

ive spent the last 20 minutes re-wringing my question so it would make sense. SO: WILL A LINE INCREASE ACTUAL DBs?

if im only increasing the input voltage/signal from my HU and not the current/power delivered from my battery, why does it make it seem like it is louder?

example, i had my gains set to almost .5v (very high i know) w/ bass boost at 1/4 and still i could not get full output of my driver. with the line driver installed and set just below 1/2 way i can now turn my gain and bass boost to a closed position and get a greater output from my driver. (still needs to be tuned)
SPLACCENT is offline  
Old 02-23-2011, 06:46 AM
  #2  
500 Watt CAFz'r
iTrader: (3)
 
Join Date: Mar 2006
Posts: 597
If a head unit outputs enough voltage to drive the amp to full output then a line driver will not improve things. Some head units may have some sort of output clipping detection on the built in pa chip and lower the dac level. (stock radios have this alot!) Increasing bass boost will influence this. Perhaps your levels where not setup properly. But great that adding a line driver helped.
zoomer is offline  
Old 02-23-2011, 07:27 AM
  #3  
Level 3 Supporter
iTrader: (17)
 
Father Yuli's Avatar
 
Join Date: Oct 2000
Posts: 11,606
your SPL should not change.
Father Yuli is offline  
Old 02-23-2011, 07:29 AM
  #4  
4000 Watt CAFz'r
iTrader: (17)
 
JordyO's Avatar
 
Join Date: Sep 2002
Posts: 6,363
Originally Posted by SPLACCENT View Post
if im only increasing the input voltage/signal from my HU and not the current/power delivered from my battery, why does it make it seem like it is louder?
Because you are increasing the power delivery.

The amplifier takes the signal from the HU and..... wait for it.... amplifies it.

Crank your gains and you won't need to turn it up as much, keep your gains low and it won't be as loud because there isn't as much signal voltage to amplify.

Really all you're doing when you adjust the gain is, in a way, adjusting at what point in your volume clicks the amplifier gets maxed out.

The down side is you start to push the amp too hard with the gains and it can no longer produce a clean signal. Then things start to fry.

*my compltely non-technical answer btw.. I'll let the egg-heads here get in to more detail if they choose
JordyO is offline  
Old 02-23-2011, 12:58 PM
  #5  
50 Watt CAFz'r
Thread Starter
 
Join Date: Aug 2010
Posts: 77
thanks a lot guys. i still think im going to leave it installed for a while. it gives the driver a different tone which i hated at first but absolutely love now. not to mention the extra output!

note: i did try maxing out my sub/amp a while back and no matter what i did to my HU setting, amp settings or wiring configuration of the sub i never gained anything noticeable. i got a HUGE output gain with the line driver.(with amp gains as low as i can set)
SPLACCENT is offline  
Old 02-23-2011, 01:14 PM
  #6  
Level 3 Supporter
iTrader: (17)
 
Father Yuli's Avatar
 
Join Date: Oct 2000
Posts: 11,606
come by for some termlab reading
Father Yuli is offline  
Old 02-24-2011, 04:41 AM
  #7  
500 Watt CAFz'r
iTrader: (2)
 
bart pyle's Avatar
 
Join Date: Mar 2007
Posts: 967
using a line driver is a good way to boost your headunit signal. If your deck output is un-clipped, and the line driver can boost that signal while maintaining un-clipped output, your amp will need to boost that signal less "maintaining non-clipp". Your spl should be maintained or improve due to the cleaner output.

Sometimes, mild clipping yields spl gains....you can never predict the outcome either way unless you test with termlab. Take Yuli's offer, could save you alot of confusion!

EX: i tested my car last week and had a woofer failure. headunit was throwing noise and once amplified, that noise caused output amperage to double, cooking coils without hesitation....you have to know your signal is clean and controlled.
bart pyle is offline  
Old 02-24-2011, 08:05 AM
  #8  
50 Watt CAFz'r
Thread Starter
 
Join Date: Aug 2010
Posts: 77
thanks bart. i did pm Yuli and were working some things out. i understand what you are saying which is making me think that maybe i can get more output from a much cleaner signal which would explain the tone difference in my woofer. i have my my 15 inch driver in a rather small box since i knew/thought the line driver would be able to push my driver past its limits and with a smaller box for better dampening to the woofer (2.5 internal tuned around 37hz)
SPLACCENT is offline  
Old 02-24-2011, 08:14 AM
  #9  
Level 3 Supporter
iTrader: (17)
 
Father Yuli's Avatar
 
Join Date: Oct 2000
Posts: 11,606
basically what Bart said, cleaner signal will sound better. output wise, there should not be any difference unless you have a deck from like 1982.
Father Yuli is offline  
Old 02-24-2011, 08:27 AM
  #10  
50 Watt CAFz'r
Thread Starter
 
Join Date: Aug 2010
Posts: 77
i do have a weak HU sony CDX-GT930U1 which is only 2.4v pre outs. i just walked my dogs and brought my line driver up so i can turn it down a bit. YULI, when are you free?
SPLACCENT is offline  

Thread Tools
Search this Thread
Quick Reply: brute power or line drive?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.