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Old 10th March 2004, 10:47 PM   #1
tktran is offline tktran  Australia
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Default My DIY Proac Response 2.5 pics

Hello all,

Haven't veneered the plinth yet... but just couldn't wait to show her off.

What I liked most about the original ProAc Response 2.5 were it's modest dimensions, equisite veneers, and D-tapered grills. Of course the sound was surprisingly good for a 2 way, but my own clones would also have to have a furniture fit and finish.

But I'd never built a loudspeaker before. So this turned out to be a 3 month labour of love undertaken over my summer (university) break.

I used page 2 of the 1996 Stereophile review as a reference for my own grill design.

What do think?

PS. More construction pictures can be found at my website. I like to call it the TroelAc 2.95 because it uses Troel's XO design for the D2905/9500 tweeter.
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Old 10th March 2004, 10:52 PM   #2
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c'est très bon, except for the plinth!

You've good the looks nailed, what about the sound?

Cheers,
Bas

Edit after I posted: Mmmm..just finished...ok...then there is not a sensible thing that can be said about the sound? Unless you ran the drive units in before mounting them in the box?
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Old 10th March 2004, 11:03 PM   #3
tktran is offline tktran  Australia
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I was shocked that it sounded great without any further modifications. (I was very careful about wall damping and lining and followed the DIY website's directions exactly) I'd agree with Troels description of them-

"Coherence... transparency... but robust midrange...close to getting it all from this modest 2 way...quite amazing"

Certainly the treble is still sweet, but not raspy. Plucked strings are less amazing than the original, but pianos and violins are more realistic.

Woofer were run in (free-air) for about 100 hrs prior to installation. Tweeters however were not.

I'm very lucky to live close to Al. M's place, and will soon be able to compare with his original DIY ProAc. I know how acoustic instruments are supposed to sound, but am not so good at describing it in hi-fi terms. I hope he'll have a few words to wirte about the sound.
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Old 13th March 2004, 04:03 AM   #4
tktran is offline tktran  Australia
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Default Some more pics

Here's some more pictures.

Neutral, laid back. Sometimes you even miss the excitement and crispiness of the original 2.5.
But I haven't found one piece of music that's intolerable or even "average" sounding. This speaker will never be fatigueing, but has enough detail to keep you interested.

I think it was Darryl Nixon that said that Troel turned the ProAc Response 2.5 from a "Wow, listen to that!" to a more of a
"Sit back and have listen to this..."
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Old 13th March 2004, 04:14 AM   #5
tktran is offline tktran  Australia
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I had a 3 friends over last night to critique these speakers. They all have different equipment and listening tastes, but all agree that it's a very good speaker.
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Old 13th March 2004, 04:16 AM   #6
tktran is offline tktran  Australia
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Someone please stop me... I'm getting addicted to posting pictures- admins- I hope i'm not breaking any rules...

The problem with veneer splitting is not obvious unless during close inspection. However, because adjacent veneer leaves run in opposite direction, some lighting conditons will clearly reveal this.

I tried sanding it, but next time I will make sure my veneer grains run in the same direction.

2nd last pic... I promise!
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Old 13th March 2004, 04:25 AM   #7
tktran is offline tktran  Australia
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I flared the port, but did not change it's dimensions.

The difference is probably minimal in terms of port tuning and of no significance in reducing turbulence (it was a non-issue in the first instance)

I did it for 2 reasons- a) much more secure way than just running PVC straight through MDF b) it looks much nicer.

Idea by Wayne Jaeschke

That's it! Off to listen to them. If anyone's interested, I can post a final picture once I've finished the plinth. Actually, even if no-one's interested, I'll still post.
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Old 13th March 2004, 05:40 AM   #8
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Is that cherry veneer?
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Old 13th March 2004, 07:38 AM   #9
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Hello,

These speakers look reallly good! Excellent job.

Now, go build yourself an amp, preamp and CD-player!!

Regards,

Jarno.
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Old 13th March 2004, 09:08 AM   #10
tktran is offline tktran  Australia
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MITMechE,

the veneer is Tasmanian Myrtle, sometimes called Australian Cherry or Myrtle Beech. It starts out pink and I wanted to redden it to become a darkish mahogany colour like this:

http://www.tastimber.tas.gov.au/species/myrtle_01.asp

but it turned out this cherry colour.

I tried staining it but my piece looked stained, if you know what i mean. So I just used Danish oil (Rustin's) and a good quality paste wax (Liberon)
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