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We blew 4no. PD1850's

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rosssss224 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosssss224 Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 7:20am
Got some images - nothing obvious and no smells etc...tried a signal and nothing. Cones moves freely as it should

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 8:45am
my guess is the generator did something bad and in turn the proline did something bad - 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosssss224 Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 9:03am

Further image just for context....!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 9:21am
Cut the dust caps off and look at the coils. They’re buggered anyways so you might as well look at the inside.

One thing I would suggest is to make sure the subs are stacked two high two wide, or on end vertically four wide to make sure the horn mouth is large enough to help reduce excursion at the lower end of the response in future too.

With FLH it’s a fine balance between excursion for cooling and excursion for thermal compression especially in smaller stacks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 2:56pm
Originally posted by Hemisphere Hemisphere wrote:

The article ypu linked to makes clear in the introduction that an amplifier that produces DC output (or anything close enough to behave similarly) is a special case and it's referenced as such throughout.
Quote 3.0 - Conclusion

There is no doubt that a clipped asymmetrical waveform will generate a DC component in the output of an amplifier. There is equally no doubt (as evidenced above) that a fully DC coupled power amp is the worst possible case. Since there is no requirement whatsoever for an audio amplifier to reproduce DC, it follows that designs that are fully DC coupled are of no benefit to the listener, and indeed may cause far greater problems than they are supposed to 'solve' (according to those who insist that DC reproduction is somehow 'better').

I think it's safe to say the amp powering your system will not be DC coupled, which sounds like something reserved for bizarro-audiophile setups.

The article is also full of completely open ended terms like 'given enough clipping the driver may be damaged' (well, yea, but how much is 'enough'?), and 'will generate a DC component'. Again, sure, but how much? A fraction of a milisecond? More than a milisecond? The mention of voice coils hitting the backplate was made with reference to a DC coupled amp driven to heavy clipping.



he looks at three different cases. the DC coupled case is the worst but all three there is significant DC current of several volts. Have you tried putting 9V battery across a driver and seen how much the cone moves? and he doesn't even try to use a particularly problematic waveform. clipping will cause driver offset which may make the coil hit the backplate or make it's cooling so inefficient it burns out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2018 at 7:03pm
Get generator and play sin 40hz. Than play square 40hz. Compare behaviour Embarrassed
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BASSHORSE Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 9:33am
pd cones dont give no warning,.blapps or flaps..they just go silent ,..if you are getting them reconed i would use rmj cones,,tryed & tested,,plenty stronger than the original pd in my opinion,..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosssss224 Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 1:02pm
Originally posted by BASSHORSE BASSHORSE wrote:

pd cones dont give no warning,.blapps or flaps..they just go silent ,..if you are getting them reconed i would use rmj cones,,tryed & tested,,plenty stronger than the original pd in my opinion,..

Prices seem to good to be true. whats the catch?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote spongebob Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 7:26pm
Originally posted by rosssss224 rosssss224 wrote:

Originally posted by BASSHORSE BASSHORSE wrote:

pd cones dont give no warning,.blapps or flaps..they just go silent ,..if you are getting them reconed i would use rmj cones,,tryed & tested,,plenty stronger than the original pd in my opinion,..


Prices seem to good to be true. whats the catch?


They're not the same driver (think T/S params, i.e. the whole reason the driver is suited for your application) as he doesn't use OEM recone kits
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Post Options Post Options   Thanks (0) Thanks(0)   Quote concept-10 Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 8:12pm
Originally posted by spongebob spongebob wrote:

Originally posted by rosssss224 rosssss224 wrote:

Originally posted by BASSHORSE BASSHORSE wrote:

pd cones dont give no warning,.blapps or flaps..they just go silent ,..if you are getting them reconed i would use rmj cones,,tryed & tested,,plenty stronger than the original pd in my opinion,..


Prices seem to good to be true. whats the catch?


They're not the same driver (think T/S params, i.e. the whole reason the driver is suited for your application) as he doesn't use OEM recone kits
This
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PauliePaul Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 8:26pm
Originally posted by rosssss224 rosssss224 wrote:

Got some images - nothing obvious and no smells etc...tried a signal and nothing. Cones moves freely as it should


It looks like you already have a set of RMJ reconed PD.1850’s there, this probably gives you the answer the question you initially asked of ‘why?’... (hint, they are not PD.1850’s any more).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2018 at 9:07pm
Ok lets put it to rest then

who favours Roy???

who favours OEM ??
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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