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Multi-Way Conventional loudspeakers with crossovers

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Old 14th April 2014, 10:19 AM   #2521
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So, I thought I would post a brief write up of my latest build incase anyone was interested. I have based it around the ATC scm50, with a few little mods to the cabinet design. My idea was to try and aproximate an asymetrical cross section in the cabinet whilst not making the cabinet too hard to build. I did this by mounting panels internaly that would break up the cross section. This also doubled up as bracing for the cabinets. Hopefully this should become more obvious when looking at the pictures I also decided to make the baffle double skinned, with a layer of neoprene in between. The bass drive unit actually bolts the baffle to the cabinet, making a very sturdy connection and helping the baffle to stay nice and firm. The boxes are built out of 25mm thick mdf, and lined with bitumen. I did also line with some very high density "egg box" shaped rubbery foam, but seeing as the cabinet is only handling frquencies from 380Hz and below I am not sure that it really does too much. So far, I haven't ported them. ATC tune their ports to support the cone at its reasonance, but I am currently not using these in a room large enough to have to worry about that just yet. I am running them actively crossed over with a DBX crossover, and some 'off the shelf' amps, but I am also currently building some amplifiers and crossover for them, photos to follow. The midrange dome by ATC is a nominal 16ohm load, so I am designing an amplifier specifically to run at this impedence (off the shelf amps which can put enough power into 16 ohm to drive the mids, will be huge as pretty much all amps are also designed to run 8ohm loads).

As with all my builds, I am struggling to 'finish' them, ie paint them and get them looking half decent. I have never been one to care about aesthetics, and my ADHD means I just want to get them playing as soon as possible, so once the drivers are bolted in, its hard to bring myself to take them apart to paint or veneer! Fortunatly I have a very understanding girlfriend, who also knows that they are moving into my studio at some point soon, so she won't have to look at them in our bedroom much longer! For the record though, she loves music and she loves the sound they make, and by dating me, I am pretty sure she can't be that bothered by aesthetics either

Finally, I would like to take this oppertunity to say thank you to ATC who have been tremendously helpful throughout this build. They really are a fantastic bunch

*edit* having difficulties uploading, so here is a link to the facebook album

https://www.facebook.com/media/set/?...1&l=2204274c07
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Old 15th April 2014, 06:03 PM   #2522
felixx is online now felixx  Romania
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@Marco.....Great work.....
Be careful with high volume level at the middle Fostex driver diaphragm.
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Old 16th April 2014, 09:03 AM   #2523
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@Marco.....Great work.....
Hi and thanks!

Quote:
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Be careful with high volume level at the middle Fostex driver diaphragm.
Sure - my goal with this system was dynamics and effortlessness, not sheer deafening volume.

Marco
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Old 17th April 2014, 05:30 AM   #2524
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monster miniOnken for Tannoy 12" Gold. My design, Chris' execution.

Click the image to open in full size.

dave
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Old 17th April 2014, 06:05 AM   #2525
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Some very nice looking cabinets! The tannoy drivers are somewhat of a classic. The 'gone with the wind' of the speaker world perhaps? How do they sound?
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Old 17th April 2014, 06:49 AM   #2526
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How do they sound?
They sound quite good. The weak spot now i think is likely the 40+ year old xo components.

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Old 17th April 2014, 05:33 PM   #2527
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monster miniOnken for Tannoy 12" Gold. My design, Chris' execution.

Click the image to open in full size.

dave
Those are beautiful looking cabinets Dave! You mentioned they sound quite good. But would you care to elaborate on their sonic pluses & minuses?


I'm listening to: Latin Color by Armi Grano

Thetubeguy1954 (Tom Scata)
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Old 17th April 2014, 06:22 PM   #2528
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You mentioned they sound quite good. But would you care to elaborate on their sonic pluses & minuses?
Here, Tom.

dave
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Old 23rd April 2014, 03:54 AM   #2529
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Default My system and DIY speakers

Anthem CD 1 tube CD player
Audio Research SP16 tube preamp has two preout
Audio Research D-115 tube amp powers Tweeters and Midrangs
Pass Threshold Stasis 2 Power amp powers woofers.
Marantz 6370Q turntable
All Casas cables

Big tower speakers 3.5 way design. ScanSpeaker tweeters and midrange , 2x12" Dynaudio woofers. Separate cabinet for xover. Weights 180 lb each, 5 feet tall.

My HT system is a totally different system that has 9 speakers (all 8" 3 ways) plus 4 of 12" passive subs. The receiver is Onkyo 818 and the sub amp is Mcintosh MC2105. PS3 and HTPC. TV is Toshiba 57" LCD cost me more than $6000 about 7 years ago, now less than 1000. I am thinking about a HD projector.
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Last edited by Nhe261; 23rd April 2014 at 04:13 AM.
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Old 24th April 2014, 04:41 AM   #2530
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Default 10 liter bookshelf rough build

car mac audio 4 ohms midbass and unknown tweeters crossed at 3500hz 6db tweeters recently burned out on party but whatever here are pics...all built using household materials nothing pro like others here but sounded very good what was only point ... used bass box pro for design aid and t/s parameters measured not precisly but measured
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