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Old 7th October 2009, 08:49 PM   #11
Zigis is offline Zigis  Latvia
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FRS8 is really good FR, I have it in Needles.
Why you choice to use 2 FR per channel? I reed somewhere, sound from one point is preferable, and FRS8 is enough "loud", especially with bass support.

BTW, I am thinking about Tysen style with inexpensive Visaton bass too. Maybe with this W170S:
http://www.visaton.de/en/chassis_zub...n/w170s_8.html
How large closed box it require? Dave, Chrisb ?

Last edited by Zigis; 7th October 2009 at 09:11 PM.
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Old 7th October 2009, 09:02 PM   #12
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Welcome to the forum Chris' dad

dave
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Old 8th October 2009, 06:34 AM   #13
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The FRS8 is 82dB at 1W/1M. (8 ohm)

Parallel that and get 88dB 1W/1M (4 ohm)

I considered the W170S, but at nearly 70L per box, I decided to leave it.

The bass performance is exceptional, with a modelled f3 of 26Hz, when tuned to 28Hz. The problem with using such a small driver is this: you use excursion really quick. Getting to 40Hz is easy enough, but after that, you need big drivers and lots of travel. The W170S is a small driver with not a huge amount of travel (the +/- 10mm shown on site is actually 10mm p/p.

At 10W, you hit Xmax at 40Hz (this is above tuning - below tuning, you run out quick), which, like I mentioned earlier, is the place of the bass drum - so you'd definately have problems.

Sealed, you get 30L, with the option of an LT circuit.

Using two per side would improve things, as you'd end up with the effective cone area of a 12", which is more capable of the bass modelled.

Chris
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Old 9th October 2009, 06:34 AM   #14
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Done some more modelling for you.

Basically, you W130S uses a box around 1/4 the size of the W170S, and the difference is around half an octave. I believe multiplying the box size by 4 to get that bit lower isn't a good, idea, but I am limited on space. You get more SPL from two of the W130s, in a box still half the size (and more power handling).

Chris

PS - am I right in thinking that if I point the speakers directly at my listening position, it will help to eliminate the comb filtering which is usually mentioned at this point.
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Old 9th October 2009, 01:18 PM   #15
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Hi everyone, interesting thread

Chris. Well done! Your designs are to be congratulated.

I hope you don't mind me dropping in and asking a few questions about the FRS8...

Its stated manuf spec is Qts 1.04 so I'm wondering if it is an Open Baffle candidate?

Has anyone tested its T/S parameters? Published specs may be shonky.

It looks like a great FR driver for the the price, but is it a tad ragged sounding
after 9kHz and is the 10kHz peak audible?

Grant .. I really appreciate any replies..
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Old 9th October 2009, 02:01 PM   #16
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Quote:
Originally Posted by chris661 View Post
PS - am I right in thinking that if I point the speakers directly at my listening position, it will help to eliminate the comb filtering which is usually mentioned at this point.
I think the closer you can mount them to each other the better or maybe try the "Calhoun" approach and mount one on the front baffle and the other on the side. http://www.frugal-horn.com/spawn-plans.html
What do the FRS8 cost? As I remember it, the CSS SDX7 was the expensive part of the Tysen component list.
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Old 9th October 2009, 03:07 PM   #17
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I'd prefer to keep them front mounted, and yes, the sepakers are as close together as they reasonably can be (7 or 8mm between them).

The price of this driver is £9, and the paremeters certainly match up (used winISD, let it auto-calculate), and yes, the Qts is high enough for OB use. I tried several different baffle sizes, but in the dn I ended up with one FR on an OB, one sealed behind it, to cancel the rearwaves.

The problem with these drivers is efficiency. While they sound good, 82dB requires a lot of oomph to get anywhere. The peak around 10kHz isn't audible, I think this is due to several factors: 1 - my ears aren't perfect at analysing sound, 2 - it's not in the sensitive hearing range.

Thanks for the interest + compliments

Chris
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Old 9th October 2009, 04:40 PM   #18
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Hi planet10, thanks for the welcome. I have limited interest in speakers these days - I don't seem to have time for my own - can't think why

Bri.
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Old 9th October 2009, 06:11 PM   #19
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Found the link for the OB design I used

new idea? to eliminate need for BSC

Chris
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Old 10th October 2009, 11:08 AM   #20
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Found where I can get a more efficient version of the FR I'm using: http://www.visaton.com/en/chassis_zu...d/frs8m_8.html they're a little more expensive, with a bigger impedance peak, but they are 6dB more efficient, meaning I only need one per side.

What do we think?

Chris
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