Here is a new one...

skrol

Pair of POLK AUDIO Liquid Cooled Floor Speakers

http://baltimore.craigslist.org/ele/2455874362.html

"They are liquid cooled so they go mono instead of blowing right away. You just turn the volume on your tuner all the way down and they reset themselves."



Not affiliated by the way...

newrival

liquid cooling drivers, specifically tweeters, with ferrofluid has been around for a long time ad is hardly "a new one." I dont understand the switching to mono part, but liquid cooling is a real thing. are the SL2000 (or perhaps sl3000, in this case, i dont know) liquid cooled? I'm not sure, but I would say they probably are.

Lowell_M

I think it's the quoted comment that he's pointing out. Good stuff.

skrol

I'm aware of the ferrofluid. It just struck me strange; conjuring images of hoses and radiators (passive of course).

I believe the SL-3000 has ferrofluid. He has the SL-2000 and I am not sure if it does.

Going mono... I figure he is really talking about the polyswitches kicking out to protect the tweeters.

The passive radiator design is described as "Fluid Coupled" in the literature. He may be confused thinking that this means that the system is intended for cooling.
Stan

newrival

skrol wrote: »

I'm aware of the ferrofluid. It just struck me strange; conjuring images of hoses and radiators (passive of course).

I believe the SL-3000 has ferrofluid. He has the SL-2000 and I am not sure if it does.

Going mono... I figure he is really talking about the polyswitches kicking out to protect the tweeters.

The passive radiator design is described as "Fluid Coupled" in the literature. He may be confused thinking that this means that the system is intended for cooling.
Stan

good points. It is certainly a strange description.

Polkersince85

Apparently only driven by a little old lady on Sunday mornings.

skrol

Polkersince85 wrote: »

Apparently only driven by a little old lady on Sunday mornings.

And Friday night Bingo.

[Deleted User]

I can remember a person calling me when I worked in CS asking if they needed to change the fluid in their speakers. If you were a fairly casual audio owner I can understand how you would think that. I explained that the air inside the cabinet was behaving like a fluid to produce low bass information. Nice person, as I remember.

civilian

Nice looking, ask them if they have checked to see if the fluid is full.:biggrin:

Schurkey

I think I know where the dipstick is.

gdb

There is/was no fluid in the 2 or 3 SL2000s that I've dismantled.

[Deleted User]

skrol wrote: »

I'm aware of the ferrofluid. It just struck me strange; conjuring images of hoses and radiators (passive of course).

I believe the SL-3000 has ferrofluid. He has the SL-2000 and I am not sure if it does.

Going mono... I figure he is really talking about the polyswitches kicking out to protect the tweeters.

The passive radiator design is described as "Fluid Coupled" in the literature. He may be confused thinking that this means that the system is intended for cooling.
Stan

The SL3000 was the first tweeter to have ferrofluid. That began production in 1989, it was one of the first projects I worked on there. The SL2500 also had ferrofluid and began production a little later on. They began production of the 3000 first because it had greater power handling capability (vs the SL2000) and wanted to get it into the flagship SDA series as soon as possible. Now regarding the "fluid coupled" passive radiator. Yes, its true they used that terminology in the literature without too much, scratch that, any explanation. As it turns out it was a little marketing-manship by Sandy Gross. If you called customer service the explanation given was that air was the fluid. If you open any physics book it will list air as a fluid with a transfer coefficient of one. I am paraphrasing here so no hate mail please. I hope this helps. Cheers. :cool:

nadams

nap wrote: »

The SL3000 was the first tweeter to have ferrofluid. That began production in 1989, it was one of the first projects I worked on there. The SL2500 also had ferrofluid and began production a little later on. They began production of the 3000 first because it had greater power handling capability (vs the SL2000) and wanted to get it into the flagship SDA series as soon as possible. Now regarding the "fluid coupled" passive radiator. Yes, its true they used that terminology in the literature without too much, scratch that, any explanation. As it turns out it was a little marketing-manship by Sandy Gross. If you called customer service the explanation given was that air was the fluid. If you open any physics book it will list air as a fluid with a transfer coefficient of one. I am paraphrasing here so no hate mail please. I hope this helps. Cheers. :cool:

Cool history on the tweeters... Didn't know that any of the SL series were ferro-fluid cooler.

And, we've been over the fluid coupling subject here a few times, but it's also cool to know who came up with the term... :cool:

skrol

Those must have been some fun times for Polk Audio with all the design tweaks and new models. I guess to day with the Blackstone and LSiM design and production release it has also been pretty exciting.
Stan

Tony M

Nice speakers but maybe somebody can get them to sell them cheaper.


I've never commented on the FLUID topic yet so this is my thing.

That "TERM" made me think Polk audio was full of it and passed on buying they're flagship,which I did audition. I thought it to be a sales scam of a sort. I then passed on hearing any more affordable models because of it.:redface:

I wish I auditioned a monitor 10 or 7 or even the 5 or 5jr. at that time. I would've been 15 years ahead of my game.

F1nut

Schurkey wrote: »

I think I know where the dipstick is.

Hehe....:biggrin:

[Deleted User]

skrol wrote: »

Those must have been some fun times for Polk Audio with all the design tweaks and new models. I guess to day with the Blackstone and LSiM design and production release it has also been pretty exciting.
Stan

Stan,
You hear the expression "these are the good old days", well it was hard to realize it at the time but they were. Polk Audio was truly like no other work place and it had quite a cast of characters to boot. Cheers. :cool:

Joe08867

Johnherpes, reported. Bye bye...

comfortablycurt

I'm going with the fluid coupled radiator theory here.

skrol

They are listed again...

http://baltimore.craigslist.org/ele/2675931933.html

No affil.

Stan

SDA1C

yea, I was going to go that route but to get aftermarket high flow filters and synthetic every 3000 miles was just too darned expensive.

skrol

If you go synthetic then I think you can extend the change interval. Just change the filter.

Mine leak enough that I just top them off once in a while and don't bother changing. It just makes a mess on the floor but I blame it on the cats.

mhardy6647

Polkersince85 wrote: »

Apparently only overdriven by a little old lady on Sunday mornings.

Fixed that for you...