Genelec 8351B Teardown (2nd Disassembled)

[Pearljam5000]

I'd rephrase that to "that's not the part that should be flexing" —the state of the material implies it is flexing.

Zero. That's not the part that's flexing.

Doesn't the whole driver move?

 

[Sancus]

So you have 0 worry about it?
Not even in let's say 10 years from now?

No. Why would I? Genelec has proven over and over again that they know what they're doing and an R&D Engineer from the company said it's designed to be like that. All the photo shows is that part of the woofer has a rougher texture than the rest, that's it. There's plenty of perfectly good reasons that the texture of one part of a glass reinforced fiber might be different from the other parts. The rest is all just random, uninformed speculations.

 

[Scoox]

All the photo shows is that part of the woofer has a rougher texture than the rest, that's it. There's plenty of perfectly good reasons that the texture of one part of a glass reinforced fiber might be different from the other parts.

I get what you are saying but I don't think there is good reason for randomly torn fibers to be there. If that area was cracked on purpose to achieve greater flexibility, the orthodox way to do that is to either use a different material or vary the shape and thickness until it gives the desired result. From the pic, it looks like that area is a stress riser, hence the paper cracked. I don't discount the possibility that it may not affect performance and reliability and that, once "broken in", the cracks don't progress. I'm just not used to the "breaking-in" being something I can actually see.

 

[RobL]

…I don't know, WIMA and Rubycon caps makes me say "no obvious corner cutting".

Huh?

 

[q3cpma]

Huh?

I disassembled my Genelec 8351B

I just wonder what ADC/DAC chip is in there. On the online, There is no answer about it So I opened my 8351B. After all the processes, I realized that the chip is just in back panel..But I'm satisfied to see what's in there. Anyway, the chip is AKM AK4621EF. Not so high end chip but fairly...

www.audiosciencereview.com

 

[RobL]

Seems like bad focus or something to me. The one next to it looks concave and that doesn't seem likely to be "real".

But in yeah, using 3rd tier capacitor brands is something actually worth getting worked up over.

He’s got several pics of the same cap. Definitely looks like it’s bulging. OP should get it looked at, maybe still warranty on the board?

 

[RobL]

I disassembled my Genelec 8351B

I just wonder what ADC/DAC chip is in there. On the online, There is no answer about it So I opened my 8351B. After all the processes, I realized that the chip is just in back panel..But I'm satisfied to see what's in there. Anyway, the chip is AKM AK4621EF. Not so high end chip but fairly...

www.audiosciencereview.com

Oops, missed that pic!
Lol, it’s actually a Rubycon that’s bulging.

 

[YSC]

Oops, missed that pic!
Lol, it’s actually a Rubycon that’s bulging.

O yea, and that's now surprising

 

[Pearljam5000]

O yea, and that's now surprising

Is that a defect?

 

[Trell]

Is that a defect?

A bulging cap is not a good sign but people forget that high-quality caps do have a failure rate even if it's much smaller than other lower quality brands.

 

[FrantzM]

A sample of one, One speaker… then One bulging cap in that sample and … Generalizations ensue

 

[dfuller]

Doesn't the whole driver move?

Yeah, but it moves in a more-or-less pistonic motion. The only part that flexes is the surround.

 

[Pearljam5000]

Yeah, but it moves in a more-or-less pistonic motion. The only part that flexes is the surround.

I guess there's nothing wrong with it but psychologically it's hard to swallow

 

[Trell]

A sample of one, One speaker… then One bulging cap in that sample and … Generalizations ensue

Should keep the thread going on for a handful of pages or so.

 

[RobL]

A sample of one, One speaker… then One bulging cap in that sample and … Generalizations ensue

No generalizing here. I’m sure these are excellent speakers. I’m not a fan of their chosen brand for the larger electrolytics but the bean-counters in every company unfortunately still influence decisions. Large electrolytics are one of the most expensive components filling a board so…

 

[ivity]

Just a reminder: Genelecs are one of the most frequently used (maybe even the most used) monitors in post-production/TV facilities, which (in contrast to casual/home theater applications) literally work in 24/7 hell and so proved their reliability for decades.

 

[dfuller]

Just a reminder: Genelecs are one of the most frequently used (maybe even the most used) monitors in post-production/TV facilities, which (in contrast to casual/home theater applications) literally work in 24/7 hell and so proved their reliability for decades.

Gens are all over post houses. They love them. They don't get run nearly so hard as music studio mains but they are in operation all the time, day in day out.

 

[Pearljam5000]

I guess the real test is if several different monitors drivers look the same

 

[pseudoid]

My good buddy 'Devil's Advocate' asked me to ask a simpleton question, and not directed to anyone specifically:
What really is the love affair (infatuation?) with powered/active speakers, anyways?
If I must; I can understand 'plug-in' boards, in sum rear access panel.
I fully understand (and respect) that designing a proper speaker is no walk-in-the-park and neither is designing active circuits.
Yet, stuffing a passive and a very reliable component (of the audio chain) with electronics just seems like a NO-OP failure just waiting to happen.
IMHO, AIOs = NFG!

 

[Elkios]

I guess the real test is if several different monitors drivers look the same

I guess the real test is if several different monitors drivers look the same

I had a little inspection of my 8341's when I bought them 3 year's ago and the rough edges were the same as other pics here. It's not a defect. They have not changed over time.