Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Pretty standard figure for quoting watts for in car entertainmentAre they serious?
http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"
10% THD sounds like a lot.
THD typically increases with frequency (due to falling open-loop gain) soOn Apr 8, 8:44 pm, BobG <bobgard...@aol.com> wrote:
But the waveform that gets clipped and produces the 10% distortion
probably occurs less than 1% of the time... when the car crashes or
the tank cannon fires, etc, so you probably cant tell if the KaBoom!
is distorted or not... 99.9% of people have never heard a live tank
cannon at a range of less than several miles anyway.
Well, for nearly the same price ($130 at Wal-Mart), you can get this
instead:
http://www.sherwoodusa.com/prod_rd6500.html
"100 Watts per Channel x 2 in Stereo Mode with less than 0.9% THD,
40 Hz-20 kHz, 6 Ohms"
The THD for a range 40Hz-20kHz should be greater (summed) than the THD
for a single frequency (1 kHz in the JVC above), right?
Are they serious?
http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"
10% THD sounds like a lot.
That would be normal.Eeyore wrote:
mrdarr...@gmail.com wrote:
BobG <bobgard...@aol.com> wrote:
But the waveform that gets clipped and produces the 10% distortion
probably occurs less than 1% of the time... when the car crashes or
the tank cannon fires, etc, so you probably cant tell if the KaBoom!
is distorted or not... 99.9% of people have never heard a live tank
cannon at a range of less than several miles anyway.
Well, for nearly the same price ($130 at Wal-Mart), you can get this
instead:
http://www.sherwoodusa.com/prod_rd6500.html
"100 Watts per Channel x 2 in Stereo Mode with less than 0.9% THD,
40 Hz-20 kHz, 6 Ohms"
The THD for a range 40Hz-20kHz should be greater (summed) than the THD
for a single frequency (1 kHz in the JVC above), right?
THD typically increases with frequency (due to falling open-loop gain) so
a 20kHz figure will be more than a 1 kHz figure.
And the THD should be higher at 4 or 6 ohms than at 8, right?
Yes you can.I dont think you can see the difference between 0.1% and 3% distortion
in a sine wave.
Absolute nonsense. You can easily see clipping on a sinewave on a scope atBut 'visible clipping' is
about 10%, and is surprisingly inaudible.
But the waveform that gets clipped and produces the 10% distortion
probably occurs less than 1% of the time... when the car crashes or
the tank cannon fires, etc, so you probably cant tell if the KaBoom!
is distorted or not... 99.9% of people have never heard a live tank
cannon at a range of less than several miles anyway.
mrdarr...@gmail.com wrote:
On Apr 8, 8:44 pm, BobG <bobgard...@aol.com> wrote:
But the waveform that gets clipped and produces the 10% distortion
probably occurs less than 1% of the time... when the car crashes or
the tank cannon fires, etc, so you probably cant tell if the KaBoom!
is distorted or not... 99.9% of people have never heard a live tank
cannon at a range of less than several miles anyway.
Well, for nearly the same price ($130 at Wal-Mart), you can get this
instead:
http://www.sherwoodusa.com/prod_rd6500.html
"100 Watts per Channel x 2 in Stereo Mode with less than 0.9% THD,
40 Hz-20 kHz, 6 Ohms"
The THD for a range 40Hz-20kHz should be greater (summed) than the THD
for a single frequency (1 kHz in the JVC above), right?
THD typically increases with frequency (due to falling open-loop gain) so
a 20kHz figure will be more than a 1 kHz figure.
Graham
I've heard 3-inch naval rifles from aboard the firing ship, and tank mainBut the waveform that gets clipped and produces the 10% distortion
probably occurs less than 1% of the time... when the car crashes or the
tank cannon fires, etc, so you probably cant tell if the KaBoom! is
distorted or not... 99.9% of people have never heard a live tank cannon
at a range of less than several miles anyway.
BobG wrote:
But 'visible clipping' is
about 10%, and is surprisingly inaudible.
Absolute nonsense. You can easily see clipping on a sinewave on a scope at
less than 1% and it's CLEARLY audible due to the high harmonic content.
Graham
horrible distorted clipped hash coming from and amp, but was that .5%,� �I have seen 2% THD described as sounding like a barrel of nails in a
cement mixer.
============================But in court, this would be objected to as hearsay. We have all heard
mrdarr...@gmail.com> wrote in message
news:8b5083e5-4d3e-4117-86d6-a3213396f804@s39g2000prd.googlegroups.com...
Are they serious?
http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"
10% THD sounds like a lot.
Michael
It is a lot. Most likely a misprint. Nobody in their right mind would spec.
an amplifier with that distortion nor would they rate an amplifier at its
clipping level as has been suggested.
Since getting less than one percent even less than 0.1% THD is trivial these
days with modern semiconductor circuitry it would seem that this spec sheet
is probably in error.
Most likely the printer or web master left out a decimal point and nobody
caught it. Call JVC and ask.
On Apr 9, 11:20 am, "Bob Eld" <nsmontas...@yahoo.com> wrote:
mrdarr...@gmail.com> wrote in message
news:8b5083e5-4d3e-4117-86d6-a3213396f804@s39g2000prd.googlegroups.com...
Are they serious?
http://av.jvc.com/product.jsp?modelId=MODL027647&pathId=5&page=2
"100 watts per channel, 8 ohms at 1kHz, with 10% THD"
10% THD sounds like a lot.
Michael
It is a lot. Most likely a misprint. Nobody in their right mind would spec.
an amplifier with that distortion nor would they rate an amplifier at its
clipping level as has been suggested.
Since getting less than one percent even less than 0.1% THD is trivial these
days with modern semiconductor circuitry it would seem that this spec sheet
is probably in error.
Most likely the printer or web master left out a decimal point and nobody
caught it. Call JVC and ask.
I downloaded the manual, and it also has 10% THD...http://resources.jvc.com/Resources/00/00/90/LVT1507-001A.pdf
Support info:http://support.jvc.com/consumer/support/index.jsp
I called their 800 number, and heard an amazingly distorted
recording. Maybe distortion is company policy? ;-)
I'll try e-mailing them (but won't hold my breath).
Well, if it does end up a mistake, this would be a pretty good
product...http://www.walmart.com/catalog/product.do?product_id=5301826
Thanks,
Michael
On Apr 9, 12:55�am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
� �I have seen 2% THD described as sounding like a barrel of nails in a
cement mixer.
=============================
But in court, this would be objected to as hearsay. We have all heard
horrible distorted clipped hash coming from and amp, but was that .5%,
5%, or 50% THD we were hearing at the time? Anyone can hear a diff in
an AB comparison with a graphic EQ in and out, but few can characteris
it quantatatively and within about an octave. Unless they have a
couple decades experience in live sound reinforcement like me and a
couple of buddies. They could win a bet in a bar if you took in a
signal generator and a spectrum analyzer. Perfect pitch.
formula is something like wave[n]=350.0*sin(twopi*n/1024.0) + (350.0BobG wrote:
�But 'visible clipping' is
about 10%, and is surprisingly inaudible.
Absolute nonsense. You can easily see clipping on a sinewave on a scope at
less than 1% and it's CLEARLY audible due to the high harmonic content.
Graham
===========================================================Lets generate a test waveform with 1khz fundamental and 3% of 3khz...
I got a response that this is utter nonsense, and its easy to see 1%** Hey Bob,
take a breath - �you are not talking about the same topic as others here !!
=============================================I claimed that one cannot see 3% distortion in a sine wave on a scope.
On Apr 8, 9:58 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
BobG wrote:
But 'visible clipping' is
about 10%, and is surprisingly inaudible.
Absolute nonsense. You can easily see clipping on a sinewave on a scope at
less than 1% and it's CLEARLY audible due to the high harmonic content.
Graham
Perhaps you have better ears than the rest of us. ;-)
There's a cellphone ringtone that supposedly only teenagers can hear,
no one over thirty - so if they get a call, their parents/teachers are
none the wiser.
Michael