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Sonido SWR069 80 litres bass reflex

PostPosted: Sun Jun 10, 2018 6:19 am
by soundbrigade
Just recently I did realize how good my small horn speakers are, designed by and equipped with drivers from Hungarian company Sonido. I did find some photos from the build that started 10 years ago.
When I had a few friends over a few months ago, I had moved furniture around in order to get a good listening area and then I understood that the 5" fullrange drivers can move a lot of air even at very low frequencies.

Over the years I have proudly shown my stuff at various DIY-meetings and been writing a lot about them at various forums and I think I have managed to impress people, maybe to the level that Istvan Varga at Sonido sent me a mail asked me if I wanted to have a pair of his newly developed oval 6 by 9 drivers - SWR069.
Have?!, I had to ask, Like getting a pair for free???
Yes!

So, a package containing two of the new oval drivers and a pair of the 6,5" FR drivers for hornspeakers with the AlNiCo-magnets arrived. The 6,5" drivers were ordered by one of my friends intrigued by the heavier magnets, as he had tried out the ferro version earlier (and was very happy).

As the hole for the driver is oval (elliptical) I have out-sourced the milling job to a company outside Gothenburg. Not only will I have oval holes, but I will have the boxes built and the annoying joints that NEVER can be hidden, whatever you do. I do hope the $500 paid for the work will do me and my drivers proud.

About the drivers:
They are 6" by 9", fullrange drivers with an AlNiCo magnet. They are designed to operate in a (big) BR-box of 80 litres.

swr069-1.jpg
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swr069-2.jpg
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I have full data somewhere, but where?! (???) I did gather all diagrams and T/S-parameters with sketches of the boxes and print the lot out .... *)

Here's the T-S:
Fs: 36Hz
Mmd: 15.7599 grams
Mmms: 17.9112 grams
Cms: 1.0912 mm/N
Rms: 1.095 kg/s
Vas: 90 litre
Xmax: 2.5 mm
Sc: 241 cm2
Re: 6.1 Ohm
Le: 0.4 mH
BI: 7.8603 T/m
Qms: 3.7
Qes: 0.4
Qts: 0.361
no: 1.0181 %
SPL: 92.08 dB 1W/1m
SPL: 93.26 dB 2.83V/1m

I will go and look for the freq response.

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Mon Jun 11, 2018 7:24 pm
by Geek
Ooooo, I love oval drivers :))

Can't wait for the finished project (wine)

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Sun Jul 22, 2018 7:43 am
by soundbrigade
Here's da halvefineeshed proJekT. Boxes made by a guy outside Gothenburg. All joints are made so no "end wood" is visible. Just a dry run.

Image

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And they fit in my car (banana) ................... just :/

Image

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Mon Aug 13, 2018 4:05 am
by soundbrigade
Got keys to my work during holiday to be able to load some fire hatches on a truck for a customer. Perfect place to do the paint job. When finished and baking in my car for almost a week, I took the speakers to the old "oil quay" in our town and took some pics.

swr069-08[1].jpg
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swr069-09[1].jpg
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Three stairs, and .... well, heavy. Very heavy.

I did manage to get the wool filling in place, ports glued with some kind of goo I got from my job, and had the drivers installed. I was FULL of expaction - how would these bastards sound like??

Well ....

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Re: Sonido SWR069 80 litres bass reflex

PostPosted: Mon Aug 13, 2018 5:33 pm
by Geek
Hahaha! Memorex commercial, eat your heart out (lol)

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Wed Aug 15, 2018 12:38 pm
by jetpack
Very nice speakers and intriguing drivers. Can you say a little more about the enclosure? What is it tuned to and what is the 1/4 wavelength? Have you taken any FR measurements? Thanks!

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Wed Aug 15, 2018 2:34 pm
by soundbrigade
I haven't done any measurements, but some graphs has been plotted by Sonido and I did publish them on a thread on a Swedish forum: http://www.hififorum.nu/forum/topic.asp?TOPIC_ID=95482

Boxes are 80 litres vented cabinets, but no other info. I can check with my friends in Budapest to get more details.

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Thu Aug 16, 2018 1:49 am
by soundbrigade
Got this info this morning:

SWR096A szimu sv.pdf
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Re: Sonido SWR069 80 litres bass reflex

PostPosted: Thu Aug 16, 2018 1:54 am
by jetpack
Thanks for the info. As many on this forum, the efficiency is getting up to something usable with gsg scale power. Definitely contemplating getting a pair to try out!

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Thu Aug 16, 2018 2:05 am
by soundbrigade
I have been running them for a few days fom a 3W 5998A (a high gain 6AS7G) tube amp and I have a listening volume that is much OK. However a doubling of the power would allow me some headroom.

Next I will try to scan the drawings of the chassis, but I have mislaid the PSU for my scanner so I have to use my camera. (???)

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Thu Aug 16, 2018 9:28 am
by soundbrigade
The box:

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Re: Sonido SWR069 80 litres bass reflex

PostPosted: Wed Aug 22, 2018 3:54 am
by jetpack
Hi Magnus. In another place on the world wide web, you once posted a link to a zipped file with GU50 schematics. The link is no longer valid. Do you still have this collection? Happy to get a pm if you'd rather not share it here. Thanks! PS, I think my next speaker project will be the Sonido 6x9.

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Wed Aug 22, 2018 5:33 am
by soundbrigade
I can pack all my GU50's and upload them.

http://www.pastisch.se/HF/GU50.RAR


Playing OMD's latest album - The Punishment of Luxury - the the room is vibrating. Good bass, really. (y)

Re: Sonido SWR069 80 litres bass reflex

PostPosted: Wed Aug 22, 2018 12:42 pm
by jetpack
Thanks very much!