What is on your workbench right now?

[g29]

My bench

View attachment 48012

Why is the perimeter of the cone ruffled in 4 peaks ???

TIA

 

[March Audio]

Why is the perimeter of the cone ruffled in 4 peaks ???

TIA

Well, I will quote Purifi on this one.

"Low Surround Radiation Distortion

• The surround contributes to sound output. Conventional surrounds produce distortion as they deform. PURIFI’s Neutral Surround geometry avoids this mechanism without constraining motion. This reduces harmonic distortion as well as intermodulation distortion."

 

[Doodski]

Well, I will quote Purifi on this one.

"Low Surround Radiation Distortion

• The surround contributes to sound output. Conventional surrounds produce distortion as they deform. PURIFI’s Neutral Surround geometry avoids this mechanism without constraining motion. This reduces harmonic distortion as well as intermodulation distortion."

Hmmzzer.. Is that like a equal (+) and (-) force produced so they cancel each other out sorta thing due to the shape and flex?

 

[digicidal]

Hmmzzer.. Is that like a equal (+) and (-) force produced so they cancel each other out sorta thing due to the shape and flex?

Either that or it's like a rear wing on a FWD compact car... doesn't do anything useful... but it looks "cool" so you pay extra for it.

 

[March Audio]

Hmmzzer.. Is that like a equal (+) and (-) force produced so they cancel each other out sorta thing due to the shape and flex?

I believe it is to provide equal compliance on outward and inward movement. I can see how normal surrounds may be different in this respect.

 

[Doodski]

I believe it is to provide equal compliance on outward and inward movement. I can see normal surrounds may be different in this respect.

Looks trick and tricky to manufacture.

 

[March Audio]

Looks trick and tricky to manufacture.

https://purifi-audio.com/transducers/

 

[Doodski]

https://purifi-audio.com/transducers/

wowow +/- 14.5 mm max throw for a 6.5" driver.

 

[Deleted member 65]

My bench

View attachment 48012

Nice!
Abandoned AMT’s in favour of that expensive Bliesma?

 

[pma]

Seas drivers (on the floor )

 

[SIY]

Is Jan going to make the design available?

Almost certainly. I was impressed at how he was able to get me almost 20dB more distortion measurement performance with the APx525.

 

[March Audio]

Nice!
Abandoned AMT’s in favour of that expensive Bliesma?

Abandoned no, I really like the Mundorf AMT, however the Bliesma has the capability to crossover at a much lower frequency which is important for a 2 way and matching directivity of the woofer / tweeter at crossover.

 

[March Audio]

wowow +/- 14.5 mm max throw for a 6.5" driver.

we will see how close we get to the model, F3 at 50Hz. Testing starts next week.

 

[solderdude]

I am curious what what is on your workbench right now.

Nothing exciting... a HD650 with a pressed in dome (to see if it measures differently) and a K702. Missing component: time

 

[LTig]

My tip of the day for working on turntables: 3 toilet rolls. They are just the right height, soft but strong and can be placed over bearings, slid around to support the deck upside down, whatever.
View attachment 48020

Sounds like a real shit job.

 

[pma]

Measuring influence of speaker cable to amplitude response.
Blue - at amp output terminals
Brown - behind speaker cable, 6m of 2x4mm2 zip cord, at speaker terminals
Audible or not?

 

[graz_lag]

... My tip of the day for working on turntables: 3 toilet rolls. They are just the right height, soft but strong and can be placed over bearings, slid around to support the deck upside down, whatever ...

But the most important advantage of it is that you do not get the hyperstatic structure, which all of us - audiophiles, want to avoid ...

 

[restorer-john]

Looks trick and tricky to manufacture.

Nah, they just leave it out in the sun and it melts like that.

 

[restorer-john]

Seas drivers (on the floor )

No Pavel, the rules are clear, the topic is "what is on your workbench right now". No off topic posts please, and that includes the floor, lounge-room carpet or kitchen table etc.

 

[LTig]

Just remeasuring the ONE Little Bear according to @MC_RME's hints.