JVC speakers and HK amp

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Ilianh

Ilianh

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Joined 2002
#1
I recently aquired a PM645Vxi Harman Kardon amplifier,

And I replaced my old JVC amp with it, its driving 2 JVC speakers that are rated 120 watts RMS

they have a 12" woofer ,5" mid and a 2" tweeter.

The strange part? the amplifier is 60 watts per channel, the speakers are rated at 120 rms (i know ive said that) but i cant turn the volume more than half, otherwise
1. my ears will bleed
2. Reaching the speaker's drivers xmax.

did they calculate 120watts rms by summing all the drivers rms? or what?

but even using a pair of speakers i made, that are 100 watts rms (and i made em, therefore i know that they can easily handle 100 watts)

i still cant turn the volume more than half before
(same conditions as above)

is the HK amp simply rocking or what?
 
#2
Ilianh said:
is the HK amp simply rocking or what?
Click to expand...

Yes your HK amp is rocking, just like my kick a** HK amp. We both have god like amps.😛

Seriously though, power ratings for speakers I've noticed don't mean anything, esspecially JVC I'm thinking. Depends what frequencies your sending to the speaker. Speakers have different power handling at different frequencies. Just like a tweeter to use a simple example. If you send 60 watts to a driver at it's fs almost any driver will blow. This never happens though cause the drivers impedance is relatively high at this point.

I also have a 60 x 2 channel rating on my HK amp (AVR20II).
 
#4
Re: Re: Re: JVC speakers and HK amp

SkinnyBoy said:


Yeah, by causing the amp to clip and burning out the voice coils.. 😛 very usefull... you are less likely to destroy a 100watt speaker with a 200watt amp, than a 200watt speaker with a 35watt amp.....
Click to expand...

Yeah, that was pretty stupid thing to say that's why I editted it out, but not before you read it. Also sometimes I just like to guess and act like I know what I'm talking about.:clown:
 
#6
"but i cant turn the volume more than half, otherwise
1. my ears will bleed
2. Reaching the speaker's drivers xmax."

The input sensitivity of most integrated amplifiers is setup such that with cd line level input, the output stage will clip at around 11.00 o'clock os so.
Rotation past 12.00 o'clock is unusable usually, unless you have a low level line input signal.
H-K's have always made my ears bleed, and the hot running and lousy soldering causes them to blow up after a few years.
More likely the H-K is clipping in the bass first.

Eric.
 
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