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Down4Sound JP95 Car Amplifier Review

Rate this car amplifier:

  • 1. Waste of money (piggy bank panther)

    Votes: 43 25.6%
  • 2. Not terrible (postman panther)

    Votes: 84 50.0%
  • 3. Fine (happy panther)

    Votes: 33 19.6%
  • 4. Great (golfing panther)

    Votes: 8 4.8%

  • Total voters
    168
...
...The people involved in car audio SPL competition ("SPL drag racing") often use multiple batteries.
Even if one was not into competition but had a competent, hi-power, after-market car audio set-up, the replacement of the alternator w/a hi-power version can provide near 400Amp, if needed.
Yet, in the realm of 21st Century EV transportation, I don't know if a thing as an 'alternator' even exists anymore.:(
[NOTE: From my understanding, most EVs do have a "12V" battery sub-system.]
 
So many years went by since I bought my Alpine PDX-V9 and things have not evolved much I see. Except for price. But still.


What should be evolved do you think?
 
What should be evolved do you think?
Like this:
 
I wonder what the noise-level is in a car. I guess very good performance are wasted in a car compared to ones living room. Does an amp for a car have to be better than this?
Although the noise-level is high, but you still need excellent car audio system, maybe something else than noise.

Also, some friends said they dont have the conditions to listen to high-end systems at home because of neighbours, so they want excellent car audio system to enjoy music.
 
Like this:
It's really expensive, even more expensive than a car.

How many people will buy?
 
It's really expensive, even more expensive than a car.
Maybe change the chasis to adjust car use.
Maybe the chassis could be used as a giant heat sink! And I agree vehicles can be noisy-a giant company I worked for was using a kind of rolling dyno they could put different surfaces onto and showed that more noise made the sound more "sour." However some vehicles are pretty quiet, quieter than some people's living situations. A good sound system in the car is still much more enjoyable than a poor sound system.
 
4 channel amplifier
I wonder what the noise-level is in a car.
Between driver THD, panel resonances, a 60dB background noise floor and 85dB safe hearing limit? Unlikely.
What is the typical background noise level in a moving car?
Ugh too many to reply to. A friend worked fighting aircraft overflight noise. The far-from-neutral FAA worked hard for decades to fight against President Clinton's decree to reduce this in National Parks, and they wanted to use a similar method of number versus number. However as @amirm alluded to it is more complex than that. The spectrum matters: pretend the road noise was ALL low frequencies and the hiss ALL high frequencies, the road noise would not drown out the hiss. Our hearing is also directional and sensitive to patterns and to music related stuff like distortion.

The noise level in cars is certainly higher than a QUIET dwelling, maybe not much noisier than some folks living situations. It also depends a lot on the vehicle: more expensive tend to be quieter, and newer cars quieter than older. The EVs we have now are very quiet driving around town. And everyone's car is pretty quiet on the freeway because the traffic is moving at 3.7 miles per hour, grrrrrr. So YES quality equipment-especially speakers-can make the sound far far better and more enjoyable, despite a funny pattern of reflections.
 
Back to this amplifier how is that Amp Dyno measuring huge gobs of power when @amirm gets like 120 watts downhill with a tailwind? And @amirm all the amp channels were driven? Or just 4 out of 5? The graphs say "both channels" so it is not clear.
 
Back to this amplifier how is that Amp Dyno measuring huge gobs of power when @amirm gets like 120 watts downhill with a tailwind?
The load was likely well under 4ohms and it was getting push well into clipping.
And @amirm all the amp channels were driven? Or just 4 out of 5? The graphs say "both channels" so it is not clear.
2 channels.
 
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