Which FRS 8 for Needle?

muispluis

Member
2016-02-24 8:08 pm
Hello everyone on this forum. I'm currenly building a set of Cyburgs' Needles from some old wood as a way of creating a budget speaker. I would like to use the low-cost Visaton FRS-8 as driver, however, I'm confused about the multiple forms this unit comes in:

- FRS 8, 8 ohm version
This one has the highest Qts of 1,04 and a large impedance peak between 100 and 200 hz. I read some forum posts of people stating this is the best of the three, but with little support of arguments.

- FRS 8, 4 ohm version
Smaller impedance peak, Qts is also smaller at 0,69. This value is the closest to the more desireable drivers such as the Peerless 35F and the Tangband TB-871, but I don't know if this says anything as the other parameters are different.

- FRS 8M, 8 ohm
Higher sensitivity and even lower Qts. Supposedly smaller Xmax (not in the specs, however) and therefore less desireable.

Also see FRS 8 - 8 Ohm
for the freq. response charts.

Can anyone help me make a choice?
 
Are you using just one driver per cabinet ? If one driver then 4 ohm
if two drivers per cabinet then the FRS 8,8 ohm.

A zobel network, may assist, at the speaker end of the cable.
http://www.diyaudio.com/forums/multi-way/190300-best-place-put-zobel-network-2.html#post4050539

Full range drivers are by nature not needing a dedicated crossover, however there are attributes
of using the high pass ability of a crossover -usually just a capacitor, where in this case the manufacturer states a
low frequency start point. You may want to factor this into the design.
 
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sayrum

Member
2011-06-11 8:01 pm
Hey
i have built with both the Vifa TC9FD18-08 (PeerlessFR35) and the Visaton FRS 8.
The Vifa is another league completely!
I would only use the FRS 8 if no other option were possible, it sounds not so good to my ears.

The Vifa TC9FD18 in the Needle improves with a BS-Network like:
0,33 mH (0,71mm air core) + 15 µF Cap + 3,3 Ω resistor all paralel and put that package in series with / to the driver.

Regards
 

muispluis

Member
2016-02-24 8:08 pm
I prefer FRS8-8 to the others.

Maybe you can try vifa TC9FD18-08 (PeerlessFR35), for me is the best cheap driver for Needle. Doesn't need bsc filter, smooth and detailed sound. Easier to fix to the box. Just 12-14 $€/each.

The Needle design is really good. Nice sound, elegant, easy to finish. I've made 4 pairs :D.

Out of curiosity: have you had the chance to listen to both the 4 and the 8 ohm?
And yes, the Peerless/Vifa seems indeed to be a better choice, but unfortunately I haven't been able to locate a supplier in The Netherlands yet.
 
muispluis,

I`ve check Needle with:
visaton F8SC - bad
visaton FRS8M - bad
visaton FRS8-8 - just ok
monacor SP-8/4 - as good as visaton, supercheap, happy owner
vifa - pretty good
markaudio alpair 6p - very good

Sorry, no direct comparison between 4 and 8 ohms. I got tired of visatons :p. To me there is better alternatives for small money.

Hey
i have built with both the Vifa TC9FD18-08 (PeerlessFR35) and the Visaton FRS 8.
The Vifa is another league completely!
I would only use the FRS 8 if no other option were possible, it sounds not so good to my ears.

The Vifa TC9FD18 in the Needle improves with a BS-Network like:
0,33 mH (0,71mm air core) + 15 µF Cap + 3,3 Ω resistor all paralel and put that package in series with / to the driver.

Regards
Agree with sayrum. If placed against back wall I dont feel the need of bsc filter.

Many vendors can send you vifa TC9: Breitbandlautsprecher und mehr - SpectrumAudio

Victor