RF punch amps came in

[Aaron Clinton 2,372]

If the birthsheets are spot on or pretty close, you still are getting a really good dollar per watt ratio.

[pimpedout97x 4]

how can i test to see if its on pair with the birthsheet

[George 0]

how can i test to see if its on pair with the birthsheet

have it bench tested.

you can do the whole dmm and ammeter thing but the problem with that is that you have no way to factor in power factor. and @ 4 ohm your calculations will be off from a TRUE wattage reading. not to mention it will be hard to run through a chit ton of freq to find where you get your lowest load to even start trying to calculate wattage.

best thing is to send it somewhere to have it bench tested. IMO however its pointless as my bostons got louder off the RF 150 than they did off the orion 8002 or the mbquart, both rated @ roughly 300w@3 ohms. so to me its obvious they are on par with the birthsheets or at least very close...and like denim said, for 200 bucks?! you gotta be chitting me, good ass deal

Edited September 2, 2007 by George

[pimpedout97x 4]

i havent hooked these on my pro60's yet, but im selling the pro60s anyways. ill prally try it out first and see. how much do you have your gains up and where you got the HPF set to?

[George 0]

i dont remember right now but i believe i was using a -3db 1000hz test tone (might have used a -6 at one time or another).

using a dmm i set the gains up to 30v (which gives you roughly 300w). of course the speakers arent getting 300w, but thats where the gain is set. birthsheet claimed 300w @ 4 ohms.

HPF = 80hz with a 12-18db slope using my eclipse cd5000. ive used my amps hpf too but currently im using the HU because its easier to adjust to my liking instead of crawling around my seats to get to the amp.

Edited September 3, 2007 by George

[MKader17 332]

oh BTW can someone answer me this: if it takes a doubling of power to get a 3db change in output, and the human ear wont really notice too much of a change below that, how come turning up the cd player 1 notch makes a noticeable difference in output? im sure your not doubling the power and getting a 3db increase. this question is bothering me lol

I'm extremely curious to the answer to this as well

[///M5 2,833]

Two part answer to your headunit question. The first part is simple Physics and the other Psychoacoustics. Your volume control knob does have a pretty exponential output, in the sonic world they call it an audio taper potentiometer but really it is pretty much just straight exponential. Part of the reason why 8v outputs are completely unnecessary on a headunit since no one runs them full throttle anyways. To talk about the other reason, we need to extrapolate on the 3dB perceptibility point. In back to back comparisons an average human can actually hear 1dB differences, but once you add the time factor and memory to be involved 3dB is better than what the average person can tell this timeblock of course is completely dependent on the individual but has been shown with nearly any other stimulation that it is pretty short. The caveat is of course a trained ear can be significantly better, typically this requires years of study on an instrument and has been proven that Musicians can regularly exceed these ranges, but the opposite is also true.

[George 0]

Two part answer to your headunit question. The first part is simple Physics and the other Psychoacoustics. Your volume control knob does have a pretty exponential output, in the sonic world they call it an audio taper potentiometer but really it is pretty much just straight exponential. Part of the reason why 8v outputs are completely unnecessary on a headunit since no one runs them full throttle anyways. To talk about the other reason, we need to extrapolate on the 3dB perceptibility point. In back to back comparisons an average human can actually hear 1dB differences, but once you add the time factor and memory to be involved 3dB is better than what the average person can tell this timeblock of course is completely dependent on the individual but has been shown with nearly any other stimulation that it is pretty short. The caveat is of course a trained ear can be significantly better, typically this requires years of study on an instrument and has been proven that Musicians can regularly exceed these ranges, but the opposite is also true.

whoa. interesting chit right there.

one quick question though (dont mean to jack this thread). what do you mean by the whole time factor and memory?

[MKader17 332]

so the headunit does almost double its output with every notch of volume?

By time factor and memory do you mean that if someone heard 120db then 5 minutes later heard 121.5db they wouldn't be able to tell the difference but if they were listening then someone turned up the volume a 1.5db notch the person would percieve the change in volume?

[///M5 2,833]

so the headunit does almost double its output with every notch of volume?

By time factor and memory do you mean that if someone heard 120db then 5 minutes later heard 121.5db they wouldn't be able to tell the difference but if they were listening then someone turned up the volume a 1.5db notch the person would percieve the change in volume?

Basically, but of course it would also depend on how much "ear training" that person has had. I leave ear training in quotes so it varies by a lot depending on the individual. Even back to back hearing better than 1dB is pretty much a farce so in a lot of cases that 1.5dB wouldn't be perceived as different either.

There is another pyschoacoustic phenomena that occurs as well. Almost always people pick the "louder" option as better, part of the reason I am not keen at all on subjective amplifier or headunit reviews/comparisons. I really don't think all the variables are normally equal.