Woofer Burn In Question

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caleb105
Posts: 27
Joined: Thu Apr 13, 2017 9:57 am
Location: Oshkosh, WI

Woofer Burn In Question

#1 Post by caleb105 »

I recently ordered the recommended Dayton RSS390 HF-4 for my first THT build. I've read everything I could find about the break-in procedure, but still had a couple questions.

What breaks in the driver best is the longest possible excursion with the lowest possible input voltage - Bill Fitzmaurice

For the RSS390 HF-4 driver.... Excursion peaks at about 22-23Hz, dropping below and above that. - Bill Fitzmaurice

I can download a 22 hz test tone. My questions center around what voltage to drive at. I've heard some people recommend "turn up the volume until you just reach peak excursion"... which in the case of the Dayton is 14mm xmax. How do I know I'm reaching xmax?

I also read a thread where Bill indicated that a full 28v could be used (even at 22hz) without damaging the sub. I'm assuming this is referring to an RMS value read from a voltmeter?... and the peak voltage would therefore be SQRT(2) or ~1.41x higher (39.5 volts)!?

If it doesn't take 28v to reach xmax, then it sounds like this isn't necessary & should be avoided?

Is there a way to calculate the voltage that produces xmax?


Sorry for all the questions, and thanks in advance for any advice!

-Caleb
"There's nothing wrong with plate amps, and nothing right with mounting them on the sub" - Bill Fitzmaurice

David Raehn
Posts: 676
Joined: Tue Apr 30, 2013 5:56 pm
Location: Colonial Beach VA

Re: Woofer Burn In Question

#2 Post by David Raehn »

If you have your plans handy:

25 - 30 Hz
10 volts
12 hours.
BFM rig:
6 OT12
4 T48
4 WH8
Other:
56 box Electrotec LabQ rig
Way too many cables
:noob:

jimbo7
Posts: 849
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: Woofer Burn In Question

#3 Post by jimbo7 »

Whatever the plans say, follow that. I don't have the THT plans, but Dave sounds around right.
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

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Bill Fitzmaurice
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Re: Woofer Burn In Question

#4 Post by Bill Fitzmaurice »

caleb105 wrote: I also read a thread where Bill indicated that a full 28v could be used (even at 22hz) without damaging the sub.
When mounted in the cabinet, not in free air. Always go by RMS, never peak. Peak is only useful in advertising.
I've read everything I could find about the break-in procedure,
Apparently not Page 8 of the THT plans. :cop:

caleb105
Posts: 27
Joined: Thu Apr 13, 2017 9:57 am
Location: Oshkosh, WI

Re: Woofer Burn In Question

#5 Post by caleb105 »

Darn It! I tried so hard not to ask something that was in the plans... and I've already failed! :wall:

Thanks for the quick replies!
"There's nothing wrong with plate amps, and nothing right with mounting them on the sub" - Bill Fitzmaurice

David Raehn
Posts: 676
Joined: Tue Apr 30, 2013 5:56 pm
Location: Colonial Beach VA

Re: Woofer Burn In Question

#6 Post by David Raehn »

Don't beat yourself up about it.

There are bigger and better things to beat yourself up over. :roll:

Look at it this way: At least you knew where to ask!

:clap:
BFM rig:
6 OT12
4 T48
4 WH8
Other:
56 box Electrotec LabQ rig
Way too many cables
:noob:

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DJPhatman
Posts: 5412
Joined: Mon Aug 14, 2006 5:08 am
Location: Warren, MI
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Re: Woofer Burn In Question

#7 Post by DJPhatman »

David Raehn wrote:Don't beat yourself up about it.

There are bigger and better things to beat yourself up over. :roll:

Look at it this way: At least you are willing to ask!

:clap:
Fixed that for ya, David! :lol: 8) :twisted:
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

David Raehn
Posts: 676
Joined: Tue Apr 30, 2013 5:56 pm
Location: Colonial Beach VA

Re: Woofer Burn In Question

#8 Post by David Raehn »

Indeed. Well put. 8)
BFM rig:
6 OT12
4 T48
4 WH8
Other:
56 box Electrotec LabQ rig
Way too many cables
:noob:

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