Frequency Modulation distortion is a common characteristic of all loudspeakers

[sharkeeper]

Frequency modulation; that is when F1 modulates F2 either via doppler shift due to active radiator area sharing or modulus by (acoustic) wavefronts, is a serious setback to any listener!

Does your system/playback room handle the crunch?

Here we have two torture tests! Playback volume: 0dB. Where 0dB on the recording is 2.0V on standard unbalanced equipment.

Test One

This is fairly intense and not too hard on amplifiers and bass bins if your system is so equipped. If you have a two way system look out though! Choir "oh's" should be crystal clear with your AMPS at WOT always.

Test Two

Pure sugar! This one will melt the voice coils in inadequate setups. The horns should NEVER flutter and should sound crystal clear while the bass shakes your bowels until you have to take a trip to the can and rid yourself of built up bile. High end setups with 50kW+ worth of LFE can cause cardiac arrest at the upper end of their capabilities. Nice roll at the end gives a 45 degree tilt to the listening room. Hold on tight and enjoy the flight.

LOWER playback volume is highly recommended until you can verify your system caps. These particularly the second one are NOT for apartment dwellers.

 

[ribbon13]

Solution: listening room is in golden ratio dimensions and walls and ceiling are covered

Are those originally MIDIs? Sure sounds like it 😛

 

[sharkeeper]

When LFE SPL hits higher levels room must be vented to prevent excessive compression. Otherwise you become coupled to the system. This is exactly why bass sounds very inaccurate in a car.

I am also very biased. I'm an organist and have a very critical ear for hearing loud pedal notes and reeds at the same time. Most loudspeakers cannot reproduce this at live levels without seriously colouring the output.

 

[Eli]

There is no way I'm turning that up all the way .... LOL

My neighbors would think I'm having a Cinco De Mayo celebration or something.

 

[sharkeeper]

You could always try it with your cans - connected to your speaker amp!

:laugh:

 

[AgaBoogaBoo]

Originally posted by: Eli
There is no way I'm turning that up all the way .... LOL

My neighbors would think I'm having a Cinco De Mayo celebration or something.

lol, i've never heard that date used like that in a conversation!

 

[Howard]

http://sound.westhost.com/doppler.htm

There may or may not be an error in his calculations... but if there is, he should have caught it long ago.

ribbon13 - a room with dimensions following the Golden Ratio is better than many, but there are far better ratios to use.

 

[thomsbrain]

it's ALWAYS a good idea to test the limits of your sound system using cheap MIDI files! they definetely reveal the most subtle nuances of your system's character. :roll:

and furthmore, any time you have doubled/chorused bass parts you will get massive phase issues, no matter what your system or room is like. that's why no one ever does it. it only works in complete seperate stereo pairs played back on headphones.

anyway, i'm not risking the embarrasement of playing those on my room setup, but my HD-580's are not having any trouble, even at jaw-spasming levels (i'm serious about the spasming).

 

[Eli]

Well, I embaressingly turned it up to just past half way..

It was rattling the windows in the living room.

Probably the loudest I've taken my Dynaco SCA-80Q so far. Sounded great!