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Altec 416z remag/recone/replace

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Posted on January 20, 2016 at 03:43:56
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 I'm using a pair of 416Z (liberated from Valencias) in my Model 19-style enclosure/biamped system. GPA 902 hf drivers.

In an effort to improve the system, I am considering selling the 416's and buying new GPA units or send the 416's to GPA for a recharge or having GPA recone my units.

Any thoughts would be appreciated.

 

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RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 05:16:34
ultraficables@gmail.com
 The Alnico woofers sound better.

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 05:54:15
kyle
Audiophile

Posts: 1839
Location: London Ontario
Joined: September 29, 1999
 GPA can recharge the magnets without doing a recone.
Why do you think they need recharging? In home use they likely won't see the kind of abuse that would discharge the magnets unless you have dropped them.
What kind of crossover are you using to bi-amp?

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 05:59:43
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 I'm using a minidsp crossing at 1200hz, 24db L-R.

I have no idea if they need recharging. I guess couldn't hurt, may help. Maybe?

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 06:12:54
kyle
Audiophile

Posts: 1839
Location: London Ontario
Joined: September 29, 1999
 Can you add CD/horn compensation with the DSP? A straight crossover won't sound correct.
I have models 19s as well and also have a number of Altec 416 variants(8B, 8Z, 8C, 421s reconed with 416 cones, all 16" frames). To my knowledge none of them have been severely abused and they all measure within the normal spec range on my Woofer Tester II device. Just suggesting that you may not need to have your 416s recharged but you do need to incorporate the horn compensation in order to have the system sound balanced and correct. Are you using 811s with your 902s?

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 06:15:31
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 Thanks Kyle. The minidsp takes care of the HF boost. Yes I am using an 811b horn.

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 10:44:20
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005
 Unless you have heard vintage alnico, against the very latest GPA ferrite motors, one can't say that for sure.

All I am saying is, you should say " IME " .

Its fun to interact with you kiddo. I mass loaded my Type 45 amp with six bricks on end, last two nights, with neat results, can't go back to stock any more ~!! :-)

LowMu

 

RE: Altec 416z remag/recone/replace, posted on January 20, 2016 at 11:25:18
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 How can you tell if a driver needs a remag?

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 04:12:44
Scott L
Audiophile

Posts: 353
Location: Knoxville
Joined: February 2, 2001
 Measure the specs and compare them:

1) to each other
2) to the original published specs (if possible)

Alnico------ a mystic blessing, yet a known curse.

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 08:40:54
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 I found it can be calculated BL= Sqrt(2*pi*Fs*Mms*Re/Qes)
My calcs show a BL of 22 which I think is good. So no recharge is in my future.

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 08:46:47
Scott L
Audiophile

Posts: 353
Location: Knoxville
Joined: February 2, 2001
So, did they BOTH measure the same ?

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 08:52:35
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 The t/s parameters that govern the BL calc were close when I measured them a bit ago using a partsexpress W-2.

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 09:48:46
Salectric
Audiophile

Posts: 1358
Location: East Coast
Joined: February 23, 2003
 If you like the sound with the vintage cones, stick with what you have. I suppose a remag would not hurt anything (although I don't know for sure), but a new cone from GPA will sound different and probably for the worse. At least that's been my experience.

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 11:43:32
kyle
Audiophile

Posts: 1839
Location: London Ontario
Joined: September 29, 1999
 BL=(2*Pi*Fs*Mms*Re/Qes)^1/2 That last missing part of the equation would alter your BL product of 22 considerably.

Also, Altec's spec sheet shows a BL of 16 for the 416-8B, which is arguably the best sounding version of that speaker. Of the ones I have sitting around, they all seem to measure between 15 and 18 on a Woofer Tester 2, which you mention that you have used. Rather than calculate BL, why not just read the number off the results page. You used the numbers from WT2 for calculating anyway.

 

RE: Altec 416z remag/recone/replace, posted on January 21, 2016 at 12:30:16
altecboy
Audiophile

Posts: 404
Location: Northern NJ
Joined: May 29, 2004
 Yeah, I meant "sqrt" to be square root.
I did read them off the results, but the bl was higher than expected, so I ran the calc and got to the same place.

 

Bl, posted on January 22, 2016 at 22:49:11
djk
Manufacturer

Posts: 6135
Joined: June 17, 2000
 The 416Z is 16Ω, so the Bl should be 1.414 times the 8Ω version.

 

Recharging alnico, posted on January 28, 2016 at 18:54:10
bare
Audiophile

Posts: 1879
Joined: April 14, 2009
 is for Fools Alnico doesn't need rechgarging unless they have been abused to the point where their voice coils have vapourised.
But urban myths and naive folks seem to flock together... a marriage made in Salesman's heaven.

 

RE: Recharging alnico, posted on January 28, 2016 at 22:33:29
djk
Manufacturer

Posts: 6135
Joined: June 17, 2000
 I mentioned nothing about recharging, but since you bring it up............

Only a fool would not have a dropped Alnico compression driver re-charged.

 

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