Driver extending way past xmax in regular use- sign of damage? - diyAudio
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Old 10th June 2011, 02:13 AM   #1
hugz is offline hugz  Australia
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Default Driver extending way past xmax in regular use- sign of damage?

Howdy

I'm using a FE206E in a Dallas II

The driver has an xmax of 0.8mm, but in regular use if I'm pumping music it will visibly move 5mm+. This is when being used WAY within the speaker's rating. I'm not clipping my 5w Firstwatt F2 and the FE206e rating is 30W ("music power" 90w).

Is this willingness to move far beyond xmax a sign of previous damage (I never had any reservation pumping 1812 overture which would move the driver 1cm+ at the cannons)

Thoughts?

Thanks
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Old 10th June 2011, 02:26 AM   #2
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I'm thinking 0.8mm is a typo. I'm not a driver expert but that seems very little for an 8 inch FR cone.
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Old 10th June 2011, 03:33 AM   #3
hugz is offline hugz  Australia
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OMost of the time you'll see no movement at all, even when played loud.. but lately I've noticed that even a bass-drum on a rock song (when played loud) will create very obvious movement when pumped.

The speakers were out of action for about 1.5 years so maybe I'm paranoid and have forgotten what they're usually like
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Old 10th June 2011, 04:04 AM   #4
BHTX is offline BHTX  United States
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hugz,

Like this, right?.. Fostex FE103E Playing Pat Metheny
(An FE103E with 0.35mm Xmax moving about unecessarily.)

BTW, your FE206E's are rated at 1.5mm Xmax IIRC, the new FE206En are 0.8mm.

I've always wondered what causes this phenomenon as well. It is by no means limited to just full rangers, either. I used to witness it on a pair of 3-ways all the time. I'm thinking it might just be related to the recording, but not entirely certain.

sofaspud,
It's common.
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Old 10th June 2011, 04:04 AM   #5
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I think if it were damaged you'd either hear it or see it at the surround or spider or both, or somewhere else. If you are not abusing your F2 I wouldn't worry over it.
I guess it's not a typo... maybe just designed for an amp such as yours. Can you tell I've never really done the FR pair hi-fi thing?
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Old 10th June 2011, 04:32 AM   #6
hugz is offline hugz  Australia
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Quote:
Originally Posted by BHTX View Post
hugz,

Like this, right?.. Fostex FE103E Playing Pat Metheny
(An FE103E with 0.35mm Xmax moving about unecessarily.)

BTW, your FE206E's are rated at 1.5mm Xmax IIRC, the new FE206En are 0.8mm.

I've always wondered what causes this phenomenon as well. It is by no means limited to just full rangers, either. I used to witness it on a pair of 3-ways all the time. I'm thinking it might just be related to the recording, but not entirely certain.

sofaspud,
It's common.
Yup thanks! my memory said 2 things.. "it's 1.5mm" and "i use fe206e. what's this fe206en business all about?".. I've been away from the internet so long that I completely missed the fe206en thing

haha as for that video.... even now the drivers only move like 5mm or something, but back in the day when I'd pump 1812 overture, the cannons would make the driver fly like in the video

Last edited by hugz; 10th June 2011 at 04:48 AM.
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Old 10th June 2011, 04:39 AM   #7
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Quote:
Originally Posted by BHTX View Post
BTW, your FE206E's are rated at 1.5mm Xmax IIRC, the new FE206En are 0.8mm.
Word is that the spec for 206e was incorrect and the only diff between it and the new is proper spec.

It sounds to me like you have some LF amp problem. If you had a TT as souce i'd say feedback.

dave
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Old 10th June 2011, 04:52 AM   #8
hugz is offline hugz  Australia
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Originally Posted by planet10 View Post
It sounds to me like you have some LF amp problem. If you had a TT as souce i'd say feedback.

dave
meaning?

(noob)
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Old 10th June 2011, 04:54 AM   #9
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Low frequency ocsillation below the box cut-off.

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Old 10th June 2011, 05:06 AM   #10
freddi is offline freddi  United States
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turntables (due to RIAA LF boost needed in phono circuit) can benefit from a highpass filter (I've a variable corner VSP Labs 4th order filter) - I know some don't want to get away from purist approach so it might be done with R&C if there's enough gain and decent Z match. FE206EN in a Karlson 12 does a pretty good bass drum at plus to minus 2mm each direction - enough to startle and say "damn!" - and that's in comparison to my Klipschorns. A BK20 rear load pipehorn sounds like its out of phase on drums and sometimes punchless. I used an AlpehJ clone on the FE206E - more power might have been better but there's compression/heating to worry about it there's more than a quick transient. Maybe you're clipping the little amp -?

0.8mm probably is the over (or under?) hang - its still usable for couple of mm each way til it audibly compresses

Last edited by freddi; 10th June 2011 at 05:08 AM.
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