AUDIOPIPE S/N 70? is that BAD?

[slim2fattycake 10+ year member]

It really doesn't matter. You can't relate one product's S/N to another since none of manufacturers rate them the same. Just like the efficiency of your subs. The audio hobby is retarded...

 

[on1wheel01 10+ year member]

Well I have 2 mojo 15's on a ap3000 and it gets stupid loud with gains at 1/2

 

[slim2fattycake 10+ year member]

that's great. that doesn't tell us shit. your gain being at 1/2 doesn't do any good for info. You do know that, right?

 

[akheathen Premium Member]

i had 3mis-matched 10's laying on the floor, and a no-name 12 in a box of a 400watt sherwood when i was 15..... that thing shook the mirrors good, boo-yah

 

[on1wheel01 10+ year member]

that's great. that doesn't tell us shit. your gain being at 1/2 doesn't do any good for info. You do know that, right?

Awwwe butt hurt much?

Havent had time to put meter on it and set properly and see what she puts out. Was just throwin out there that they are good budget amps.. If u dont like it kills yourself ***

 

---------- Post added at 12:30 AM ---------- Previous post was at 12:30 AM ----------

 

op where in nc r u

 

[VWBobby 10+ year member]

People really get butthurt over the most stupid things.

This isn't rocket science.

Its just like the aspect ratio (profile size) of a car tire. A 225/40/17 tire would have a 40% aspect ratio. The sidewall is 40% of the tire's width (225 * 0.45 = 101.25mm).

You are familiar with ratios correct? So, an 85Db ratio should be 85% of 100Db.

This is the most simple definition of the term I have found:

"Measured in decibels (dB), signal to noise ratio compares the strength of the desired signal (such as your music) to the level of background noise. A higher value indicates less background noise."

Believe what you want. I've heard plenty of Audiopoop installs, and I would say they are muddy. Could be install, but I doubt it.

 

[akheathen Premium Member]

"muddy" is not directly corelated to s/n ratio. "muddy" is a result of uncontrolled output. and, your logic suggests that there is a possible 0ver 100% noise output, meaning the noise is louder then the signal, and rated as a good thing....... think about it. your math and quote do not even agree. i am more than familiar with tires, ratios, amps, etc...... been repairing amps since mid-90's, and working as a mechanic for 10years, soo........

 

[VWBobby 10+ year member]

"your logic suggests that there is a possible 0ver 100% noise output, meaning the noise is louder then the signal, and rated as a good thing....... think about it. your math and quote do not even agree."

How does it not make sense? I am not saying anywhere that it will make more noise than usable sound. I am not sure what standard they test to, since the S/N ratio is not specified as harmonic, intermodulation or other types of distortion/noise. Here is a formula for finding S/N ratio.

All I can say for sure is that in my experience, Audiopipe amps do not make clean power and do not sound good doing it. Take it or leave it...

 

[akheathen Premium Member]

yah, that is a different matter, though. the problem is that it is an electrical rating that is presented in an acoustical value due to the rms differences. really the rating cannot be universally duplicated across different equipment by going off decibels, because it's not real decibels that it's rating. it's a universal effect to which there is no "controll" for comparison. in short, the amp is not going to emit 31 or so watts of noise on it's own, at that level, it would need to come from the source signal, or the amp is as simple as something from the 50's low end....and you do not get 70db of noise at 100db of playing signal. the rating system was poorly transferred to the audio industry, on the electrical side of things anyways, but it is universal, so it's still used.....

 

[VWBobby 10+ year member]

I think where it gets confusing is what the spec is actually measuring. If we are to take it at face value, it should suggest the amount of amplified signal verses the amount of amplified noise. Represented as 70:1, 92:1, or 97:1. What that would mean is, at a 70Db S/N, you would have 70 times the amount of clean signal to 1x dirty signal (distortion). A higher quality 91Db S/N, would be represented as 91 times the clean signal to 1x distortion signal, 91:1.

One physics site eludes to this notion..... for 97Db S/N ratio:

"97 / 20 = 4.85

10^4.85 = 70,795

The decibel is like a decimeter, its prefix means its 1/10th the size of the unit following the deci part. A bel is a pretty big change and its easier to relate to it without having to use the decimals."

What is meant by "signal-to-noise ratio?" [Archive] - Physics Forums

According to them, the signal is "70,795 times bigger than the noise"

So.... If you take that formula, and change it to 70Db S/N ratio you would get: 3162.277~

You might want to double-check my math. 3162 bigger than the noise, doesn't sound right to me, but you can see that's a lot more noise than at 97Db, according to them. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Either way, its a good discussion and I think a lot more people should dive into the science behind good sound, or at least understand it better.

 

[XORstatus 10+ year member]

This discussion is getting EXTREMELY technical, I am NO idiot, BUT alot of what you're saying is going over my head.

Is there a way to simplify these explanation so that someone who does not have a background in electronics or elevated mathematics can understand this discussion.

I am interested in understanding what you're saying, but you can't expect an infant to understand the explicit technicalities.

SORRY IF THIS IS ANNOYING!

 

[akheathen Premium Member]

once again, that calculation is refering to signal to noise ratio in spl, which is what the amps represent, however, they are not really rated at those calculations.... that one would be used in calculating the s/n in an environment, such as rating the acoustic dampening, or feed-back/noise of a sound emitted in the said environment. did some searching, can't remember which site, but it is explained exactly what it is measuring, and how/why it is represented in decibels. in short, the rms (root mean square, with no detectable distortion, which could also be less than the rated rms, because they sometimes rate at higher levels of distortion) of the specific amp in question is a "floating point" i.e. no set value to compare all amps by. so, while in the rms range, they measure a noise, effected on the amp at the same voltage as the input signal, and measure the ratio of the 2 signals at the final outputs. decibel system was chosen to represent the ratio, however, it really does not relate to actual spl output. it is used as more of a metaphor to have something more universal. imho, they really should have assigned no unit to it, just a simple ratio.

so, plain and simple, if your vehicle carries a signal through the power supply as strong as your input signal, it can be played at 1/70's the wattage that the desired signal is playing, but you would hae to have one huge half-broken alternator and no/weak battery to see it played at that level, imho. and, as for sub amps, it would not matter if it was 50, or 150, you will not hear any of it if your wiring is good, your battery is sufficient, and your alternator is good for the task.

 

[whitedragon551 5,000+ posts]

BCAE1 section 124 is S/N

 

[XORstatus 10+ year member]

once again, that calculation is refering to signal to noise ratio in spl, which is what the amps represent, however, they are not really rated at those calculations.... that one would be used in calculating the s/n in an environment, such as rating the acoustic dampening, or feed-back/noise of a sound emitted in the said environment. did some searching, can't remember which site, but it is explained exactly what it is measuring, and how/why it is represented in decibels. in short, the rms (root mean square, with no detectable distortion, which could also be less than the rated rms, because they sometimes rate at higher levels of distortion) of the specific amp in question is a "floating point" i.e. no set value to compare all amps by. so, while in the rms range, they measure a noise, effected on the amp at the same voltage as the input signal, and measure the ratio of the 2 signals at the final outputs. decibel system was chosen to represent the ratio, however, it really does not relate to actual spl output. it is used as more of a metaphor to have something more universal. imho, they really should have assigned no unit to it, just a simple ratio. so, plain and simple, if your vehicle carries a signal through the power supply as strong as your input signal, it can be played at 1/70's the wattage that the desired signal is playing, but you would hae to have one huge half-broken alternator and no/weak battery to see it played at that level, imho. and, as for sub amps, it would not matter if it was 50, or 150, you will not hear any of it if your wiring is good, your battery is sufficient, and your alternator is good for the task.

I dont know how to thank you, I understood that precisely.

I have gotten form this tread what I set out to glean form it.

Primarily because your your direct and concise explanation.

PS I "Thanks" 'ed you. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif