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Day Two in the Life of a 4 Pi [message #35102]

Tue, 12 February 2002 13:41

Garland
Messages: 269
Registered: May 2009

Grand Master

Last night I set up the speakers at work out of phase and facing each other an inch apart and ran moderate FM hiss through them for what I hoped would be all night. This morning I arrived to at work to find the speakers spread apart and a Madonna CD in the player. I asked the guy who works in my room what the deal was with the speakers since I had left a note on them saying what I was doing with them. He said that one of the architects upstairs had come down and wanted to listen to them so they never got the over night break-in.

To make a long story short (if it's not too late), the speakers continue to sound good though they are facing a work table three feet away and are sitting right next to each other. I was playing Stan Getz and Joao Gilberto at Carnegie Hall and they were right there in the room with me. Enough for now, will submit a review in a week or so and again when the Paramours are finished! I'm still Psyched!

Garland

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Re: Day Two in the Life of a 4 Pi [message #35105 is a reply to message #35102]

Tue, 12 February 2002 15:26

mikebake
Messages: 243
Registered: May 2009

Grand Master

I'm sure I'll get the angry bees buzzing at me, but I still don't buy the "break them in" idea, at all. I'm in the camp of "it ain't been shown to be so" ......my perception is that nothing supports this idea. I frankly believe we are simply "learning to hear" the new speakers and appreciate them. Okay, everyone, buzz on............

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Re: Day Two in the Life of a 4 Pi [message #35106 is a reply to message #35105]

Tue, 12 February 2002 15:41

Adam
Messages: 419
Registered: May 2009

Illuminati (1st Degree)

Well I think breaking in does do something (there is documentation of specs being different before and after break in) especially with these woofers with stiff suspensions, but I don't think I would ever bother with the reverse phase and test tones. Might as well just break them in on music. But then again, I can play mine loud.

Adam

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I'll admit that 24 Hrs. at 2.83 vrms at 30 Hz. [message #35107 is a reply to message #35105]

Tue, 12 February 2002 15:55

Sam P.
Messages: 307
Registered: May 2009

Grand Master

had zero effect on the measured Fs of my pioneer 8's. But I really am pretty sure that the bass became fuller, more natural sounding after about 2 weeks use with my jbl 4648A-8's. Could be a learning curve, sure, but when I broke in the second pair...they sounded noticably less full in bass response until they also hit around 2 weeks use. But one set is short wall, the other long wall. Diff. xover points, but same LF systems. Same amp. Different wire. (buzzzz) They now sound the same to me. Sam

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Re: Day Two in the Life of a 4 Pi [message #35112 is a reply to message #35105]

Tue, 12 February 2002 17:03

BillEpstein
Messages: 886
Registered: May 2009

Illuminati (2nd Degree)

JBL believes:

The Thiele-Small for the M-115 woofer are for before and after a power test as follows:
Fs 46, 42
Re 5.3, 5.3
Qms 5.1, 4.6
Qes 0.42, 0.39
Qts 0.39, 0.37
Vas 225L, 275L
Mms 53g, 53g
Cms 222uM/N, 271uM/n
Bl 14TM, 14TM
Rme 37, 37
Sd 845 sq cm, 845 sq cm
Le 1.3mH@1kHz, ditto
Rg 0.91 degC/W, ditto
Rt 1.56 degC/W, ditto

Power test 50-500Hz 40V RMS (250W) Free air for 100 hours

Hey Garland, tell the creep from upstairs that if he doesn't keep his hands off you're speakers, you've got a blue collar friend that's going to kick his effete eastern establishment architect ass! Madonna! Yeesh!

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Re: Day Two in the Life of a 4 Pi [message #35113 is a reply to message #35102]

Tue, 12 February 2002 17:09

Garland
Messages: 269
Registered: May 2009

Grand Master

Normally, I'd not bother with the break-in process if the speakers were at home but since they are at work and I can run them over night with a bit of noise, I said what the heck! Music is my preferred use for loudspeakers!

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