FR125S post break-in T/S parameters - diyAudio
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Old 19th September 2005, 03:29 PM   #1
Vikash is offline Vikash  United Kingdom
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Default FR125S post break-in T/S parameters

The FR125S drivers have been running in for 65 hours (15Hz sine wav at max exursion). Here's the post break-in T/S results.

Driver A
Fs: 64.6
Vas: 6.3 l
Qts: 0.65
Qms: 4.2
Qes: 0.78

Driver B
Fs: 62.8
Vas: 6.8 l
Qts: 0.72
Qms: 5.4
Qes: 0.83

How are you getting on with yours Dave?

Anyone else have comparable results?
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Old 19th September 2005, 03:51 PM   #2
MJK is offline MJK  United States
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What were the pre-break in, right out of the box, measured parameters?
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Old 19th September 2005, 03:54 PM   #3
Vikash is offline Vikash  United Kingdom
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Sorry Martin, I didn't take any I can for the next pair if you're interested.

They're generally not of any importance IME.
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Old 19th September 2005, 04:21 PM   #4
MJK is offline MJK  United States
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I have measured many drivers before and after break-in and not seen any significant shifts. Just curious for more data.
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Old 19th September 2005, 04:27 PM   #5
Vikash is offline Vikash  United Kingdom
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These results may be of interest to you then:
http://www.vikash.info/audio/audax/break-in.asp
http://www.vikash.info/audio/xls10/

The other FR125S driver pair straight out of the box:

Driver C
Fs: 77.6
Vas: 4.6 l
Qts: 0.79
Qms: 5.80
Qes: 0.92

Driver D
Fs: 75
Vas: 4.7 l
Qts: 0.82
Qms: 6.00
Qes: 0.95
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Old 20th September 2005, 12:45 AM   #6
theNoid is offline theNoid  United States
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Another testers results...

http://www.diymobileaudio.com/forum/...read.php?t=832

Noidster
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Old 20th September 2005, 05:00 AM   #7
soongsc is offline soongsc  Taiwan
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I wonder if you get different results with different signal amplitudes or whether you use sine seeep or MLS signals.
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Old 20th September 2005, 07:35 AM   #8
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Interesting article on the subject:
http://www.audioholics.com/techtips/...kerBreakIn.php

When you've burned in the 2nd pair of drivers for the same amount of time as the first, and chance you could post the, er, post burn in measurements of these too. It'd remove the sample variation factor and give another interesting set of comparisions.

Cheers
Scott
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Old 20th September 2005, 10:12 AM   #9
Vikash is offline Vikash  United Kingdom
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Quote:
Originally posted by Scottmoose
Interesting article on the subject:
http://www.audioholics.com/techtips/...kerBreakIn.php
Quote:
Required break in time for the common spider-diaphragm-surround is typically on the order of 10s of seconds
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Old 22nd September 2005, 02:26 PM   #10
Vikash is offline Vikash  United Kingdom
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Post break-in:

Driver C
Fs: 63.1
Vas: 6.6 l
Qts: 0.65
Qms: 5.01
Qes: 0.75

Driver D
Fs: 61.7
Vas: 6.7 l
Qts: 0.68
Qms: 5.24
Qes: 0.78

Modelled differences in 10l sealed enclosure:
Click the image to open in full size.

Fs has dropped nearly 15Hz across the board, and VAS is up by 2 litres. Regardless of this, the modelled bass response doesn't show huge differences.
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