Cyburgs-Needle for Tangband W3-871S

[Solve]

Thanks Bjorn for your effort!
Would be very nice to try your design with this driver.

Solve

[Solve]

Hmm...just found an old discussion with W4-657SC .
Maybe its an bad idea?
To many noth filters?
If i put a some more money and go for W4-1320SA
Better idea?

Solve

[kristleifur]

A question about the Needles:
I'm building an 41hz Amp6 for eventual use with Needles (and probably TABAQs as well ...). This is a Tripath amplifier, and it requires use of input capacitors, creating an RC filter on the input.

In its stock configuration, the filter has a corner frequency of 2.2 Hz. As the Needles and TABAQs have a useful frequency response starting from around 50Hz, I understand that the filter frequency could be raised a bit. This could enable use of "fancier" capacitors. Also a benefit of a smaller coupling cap in these amps is that turn-on thumps are lessened.

A possible benefit, if I understand correctly, is that frequencies below the speakers' frequency response range are attenuated. If I were to raise the filter's corner frequency to somewhere around 5-8Hz, the amp's output at 50hz should be free of phase distortion, while lessening output to the spekakers in the range below 50hz. My question is really whether it would be beneficial. What do speaker cones do when asked to reproduce signals below their frequency range? For example, what happens when a 20hz signal is fed to a Needle? Does the speaker just 'ignore' it, or does it have a detrimental effect on the rest of the frequency spectrum to ask the speaker to reproduce this 'impossible' signal?

Also, how close to the 50hz mark could the filter's rejection range be put? From the frequency graphs, there is *some* output below 50hz. A thought experiment: what if there was a "brickwall" filter that removed EVERYTHING below 50hz going to the speaker? Would there be an audible loss of anything, or would it just serve to clean up the signal, allowing the speaker to do its job better?

I hope I'm making myself clear The question, in its simplest form: would aiming the filter's response at an unspoiled frequency response above 50hz be useful? Should I go lower, and aim for clean output at ~40Hz and up?

Regarding the TABAQ speakers, I'm very interested. I'm planning to build both Needle and TABAQ boxes, and try 871 cones in them. I'm not sure how to read SPL/frequency graphs, but it seems that the TABAQ has a flatter response, but is quieter. I'd actually say that the TABAQ design warrants its own thread here on diyaudio, for easier reference and to help the discussion from getting tangled up with Needle issues.

[Bjohannesen]

Kristleifur, yor are right. Sorry I have inerrupted the Neelde discussions. I will start up a new thread for TABAQ.
Bjorn

[gychang]

Originally posted by lohk
I finished my new Cyburgs Needle a few days ago. I implemented the Tangband W3-871S.

I used the Tangband without the much recommended notch filter. Well all loudspeakers (and amplifiers) do actually sound so different one from the other, I do not hear any unbearable emphases with this one.
Thanks Bernt for that one.

Klaus

Klaus, I may be buying the W3-871S and plan to use it with t-amp, where can I get the demension/size and plan, is there a website?

thanks

gychang

[gychang]

Originally posted by Landroval

Hi gloss white is great. Here's my JX92's

how did u make the grill?, like to do the same.

thanks

gychang

[gychang]

Originally posted by ervington
I plan on building a pair of needles very soon. I'm trying not to overstep my own abilities, so I ordered the TangBand W3-871S so I don't have to reinvent the wheel and can follow in others' footsteps.

Once I get them built, though, I know I will want to experiment and try other things. The option I find most interesting after reading this thread is the bipole arrangement. I know this is a newb question, but I'm a newb, so it's ok.

How do you wire the speakers as bipole? Do I need four sets of speaker outputs, or can it be done with just two?

I can find how to wire things in series, in parallel, etc, but my internet search skills are apparently lacking since I can't figure out something that it seems everyone else knows how to do. Sorry for my ignorance.

~erv

planning on doing exactly same, let us know what u think about the sound.

gychang

[greenie512]

Here's a pic of a pair of needles I built a few weeks ago and for more construction pics follow link below

http://www.greenie512.net/greenie512/html/needles.html

Great little design - thanks Cyburg

[hm]

Bipole is interesting:

http://www.hm-moreart.de/105.htm

http://www.hm-moreart.de/7.htm

feedback ??

[lohk]

gychang, just in case you did find the according pdf yet, here a copy to gif of the w3-871 datasheet: