Proac 1sc/Response One Clones

[b_online]

Hi,

I am planning clone the Proac 1scs and I have a couple of doubts regarding the cabinet construction.

I was thinking of making the cabinets deeper but keeping the same internal volume for the cabinet. The idea of doing so is to have a separate internal cavity for the crossover to minimize vibrations.
Im not going to lie either: I want to make the cabinets in plywood a la Penaudio Charisma (www.penaudio.fi), and they will also look nicer eing a bit deeper.

The doubt I have is regarding the port for the bass reflex system:

If I add the extra depth and move the port tube further, will that affect the cabinet tuning or performance in onay other way??

I have attached an image with both options included:
On top - the original construction (dimensions are not final yet)
Below - the optional deeper cabinet


Any help will be appreciated, and BTW, if anyone has the precise dimensions of the original PROAC 1sc Id appreciate it a lot if they could pass them on to me... !

Thanks for the help,

B

[John Sheerin]

It looks like your deeper box will move the port out of the box (the part the woofer sees). This will change the tuning. A secondary effect would be that the port inlet would now be baffled, and that would have some influence on the acoustic length of the port. So you would have to look at what the box tuning would change to and see if that would negatively influence the design. It could be that the volume change is insignificant.

John

[b_online]

Yes, to tell the truth, this are my first diy speakers, and although I don't understand many things yet, I had the impression that box tuning would probably change....

To tell the truth, I really liked the deeper cabinet: it looks nicer and the speaker would probably be a bit heavier and tend to rock less on the stands.

I anyone else has any comments, here I am.

Thanks again for the tip,

B

[Eccu]

Hi b_online!
I guess you might want see these pictures (This is not ProAc clone but same idea in capinet:

http://koti.aina.fi/helmi/aw-6i.html
http://www.hifitalo.fi/rak/aw6.htm


By the way, this page is not mine. Unfortunately these pages are only in Finnish but I can translate some text if you want.

[b_online]

Yes, that is exactly the look I am looking for my speakers.

The only detail I am not so sure about is how the guy placed the veneer on the top and bottom and the speakers. It doesn't look bad, but it doesn't look as good as the Penaudio charisma speakers. ( www.penaudio.fi )

I was thinking of leaving a plywood solid plank on the top and bottom so it looks like the speakers are carved out of a solid piece of wood. I hope you more or less get the idea....
I think that in this way I will not get the difference in tonal colour from the sides to the top.

I wanted to ask you a question: could you please translate the text in the picture where you can see the products he has used to finish the wood?
I have never worked plywood in this way and I don't really know what the best option will be....
The finish of the speakers looks very nice: matte and very natural.
I'll probably place an order for the products and try them on a small sample to evaluate the results and if they are positive I will apply the products to the cabinets.


Thanks very much for the feedback!


B

[b_online]

I guess that to do that I will need to use Birch Plywood.

That way the sides of the cabinets will have the same tone (colour) as the top and i will not need to veneer either the top or the bottom.

Thanks again for the tip !

B

[Eccu]

This image name is in english 'top glueing' but I guess there must be also some kind 'tenon jointing' or similar.
http://koti.aina.fi/helmi/kannen_liimaus.JPG

Maybe it does not look as good as commercial speakers, for reason!
I guess Charisma have some additional veneer on top!


Did you mean these pictures ?
http://koti.aina.fi/helmi/vahauksen_jalk.JPG
http://koti.aina.fi/helmi/vahauksen_jalk2.JPG
http://koti.aina.fi/helmi/liima_ja_vahat.JPG
Vaha is finnish and means wax in english.

Words from those OSMO COLOR cans:
LÄPIKUULTAVA means translucent in english.
I don't know what is right english word for PUUVAHA but I guess it woodwax.
KASVIÖLJY POHJAINEN means vegetable based oil or something

So that guy have been use OSMO COLOR woodwax.

[Eccu]

These are nice Finnish speakers too...
Made from (soap)stone


http://www.flinkstone.fi/hifi.html


Or how about speakers with 100% humidity and 120°C heat endurance for sauna?

[jim]

b_online ,

Do you know where I can find the plans of the 1SC-clone ?

I'm interested in a small DIY two-way system, does anyone have some other recommendations. Only drawback is that the efficiency must be equal or higher than 88dB/1W/1m.

Thanks,
Jim

[b_online]

To do the Proac clones you will need to midbass driver that is specially manufactured for Proac and not available to the public.

I have allways tried to be supportive to other members of the forum. The people that have received the 40 mb files for the Heil Loudspeaker that won the Ciare loudspeaker competition can give good faith of this.
However, with the 1sc crossover it is a different story. Not because I wouldn't like to share it in the forum, but because the person that gave it to me asked not to give it away on the internet. (and I gave him my word) There are many good diy loudspeakers around. The reason that I am buiding the 1scs is due to the fact that my amp was designed with the 1sc in mind and the combination is really magical in terms of synergy.

If you can't get hold of the drivers you could visit the Tony Gee website and have a look at the Proteus. It looks very interesting.
Wilslom audio (UK distributor of ScanSpeak) has also very nice kits (if that is what you are looking for).

I hope this didn't dissapoint you.
However, if you need any further help, please don't hesitate to send me an email and I will send you a list of all the research I have done on the internet so you can check all of the speakers I have evaluated building. I am sure that many of them are much, much better than the Proac 1sc and you will be able to build them for a similar cost the 1sc will be.

What I would advice you to do first is to research the internet looking for reviews on you amplifier, recommended system setups, what the manufacturer used to demo it at hi-fi shows, etc etc, so you can more or less have a rough idea of what will work with it in terms of synergy. Then you can try to find something that will work properly with your setup from all the links I will give you.
And please, if you have any doubt , do not hesitate to ask me, eh?