FX 120 Build

[ODougbo]

I've been working on some projects using the full range FX 120. I made some trial runs/mock ups and these have been the best so far.

The Onken design: (who thought of this) very clever. I smiled when building them, not really a puzzle, pretty straight forward ~ once you get into it. The compact design is nice.

They sound great, full body sound; with this box tuning, the F3 will be approx. 55Hz and F10 will be approx. 45Hz.

The tall red ones, DBR: Most noticeable, the bass, there's plenty, no eq needed there. I did turn down the mid, -4db; they were sounding pretty good; they put me out by the 2nd track, that's always a good sign (relaxing).

[only the top 1/2 section is the speaker box]

The FX 120 in general: hard to tell where the music is coming from, can't tell which speakers are playing. They seem very sensitive with eq settings; type of sheet goods, damping, etc. Also the high end is all there, they sound like tweeters and woofers at the same time.

I didn't like the sound when both were playing at the same time; I assume there was a lot of cancellation was taking place.

They fill the room with sound, no problem. I did pull out an old Sansui 7070 from the 70s (that I bought new), it sounds better than ever.



"The possibilities are endless" Dr. Walter Bishop

[vinylkid58]

Originally Posted by ODougbo

The Onken design: (who thought of this) very clever. I smiled when building them, not really a puzzle, pretty straight forward ~ once you get into it. The compact design is nice.

Although, not the creator of the "Onken", Dave (Planet_10) gets 90% of the design credit for this "Fonken" derivative.

Nice work Doug, they look great.

jeff

[planet10]

Doug,

That looks like a set of FF85K in the (far too big) boxes below Jeff-san's miniOnken variation?

Fonken-steen next?

dave

[ODougbo]

The small 3" Fostex woofers? I don't remember, I'll have to pull one out and look at the model number. I do remember they sounded pretty nice, i.e for a small, simple ported box. No way near the what the 120s can do.

I need a speaker project, I really enjoyed the Onken design and looking forward to the next build. Yes, I'll have to go with a 8 vent, Fonken-steen pair next.

[planet10]

Originally Posted by ODougbo

The small 3" Fostex woofers? I don't remember, I'll have to pull one out and look at the model number. I do remember they sounded pretty nice, i.e for a small, simple ported box. No way near the what the 120s can do.

If it is FF85K i'd class it as better than the FX120 if used as a mid-tweeter -- definitely not a woofer. The new ones are even better.

No need to remove them to look, the surrounds are pretty distinctive...



dave

[ODougbo]

I've been switching back and forth with the A/B switch and had a chance to compare the DBR vs. Onken. There's not much difference in the bass that I hear. And the tall red DBR's have the advantage of being tight in the corner.

A lot of positive reactions from people that have heard them. I showed them to a A/V buddy, he got a good laugh, he didn't know what was going on, i.e. one speaker, small cabinet, big sound.

I will go back to them and try different damping material, maybe reinforce the back (I have a few crazy ideas). However, going to build more sets, with better material.

Ordered the Fostex FF125WK yesterday, not sure what cabinets to use.

[chrisb]

Originally Posted by ODougbo

I've been switching back and forth with the A/B switch and had a chance to compare the DBR vs. Onken. There's not much difference in the bass that I hear. And the tall red DBR's have the advantage of being tight in the corner.

A lot of positive reactions from people that have heard them. I showed them to a A/V buddy, he got a good laugh, he didn't know what was going on, i.e. one speaker, small cabinet, big sound.

I will go back to them and try different damping material, maybe reinforce the back (I have a few crazy ideas). However, going to build more sets, with better material.

dude, you're hooked - tried them with the Luxman yet?

Ordered the Fostex FF125WK yesterday, not sure what cabinets to use.

I think you do

[ODougbo]

Oh gosh...that Luxman is heavy. I wrapped it up and tucked it away today. However, it's not far and I'll use it for the next full range build.

Hooked? Being a newbee, I think I was reeled in..but thanks gentleman for showing me something I never would have know about, thought to build.

[ODougbo]

Okay...but I had some help and also started up an old computer with Perfect Box.

Going to make up some mock-up 11liter boxes, with a 20 square inch port, (that will be a deep rectangel).

There's a way to semi-build and box and clamp it temporarily for fine tuning ~ by sliding the baffle and "port" at the same time.

I'll tune the box w/ a generator/voltmeter to 56hz.

I think the supplier was low on FF125wk speakers, however, I hope they are here this week.

Originally Posted by chrisb

I think you do

[minhaj]

May be it not important to some people. None of the above boxes are onken. Painfull to me but many other members here call these boxes 'onken' -I wonder why?

I request Dave to explain whis is onken and which is Fonken/mini onken etc. We should not be confused.

Regards