Well, I dont know what they told you Chris. I have just stated facts I know. In the active SCM50/100 you find 16 ohm mids (Super), in passive SCM35/40 - 8 ohm (non-Super). The reason behind that was my guess. I know that you can buy on the market both 8ohm and 16ohm version but in Standard, as Super is reserved for ATC actives only.
I did quite a lot of research into it so I knew they were 16 ohms in both. Eventually I would like to get hold of some active units to fit to mine.
Regards
Chris
I am going to build the active "clone" with DEQX crossover and 6 channel amp. DEQX gives you a lot of possibilities to check out diffrent crossover points and slopes. You can also change tweeters and adjust that in DEQX easily. I think future belongs to active DSP designs. So if you have trouble with passive xover go active with cheap miniDSP instead and D class amps like Hypex.
The only chance is to ask sb with the right equipment and knowledge to come to your place, unplug the drivers from the passive xover, connect them directly to the binding posts and use electronic xover. I did that with my DIY project based on Scan Speaks drivers I had bought second hand and the diffrence was night and day. As I said the future belongs to active DSP designs and their cost is going down.
It is so easy to choose between diffrent filters, xover points, slopes. You can EQ frequency response, it is easy to blend the sytem with extra subwoofers. Really I cant see any disadvantages apart from the cost. And you dont have to know how to design passive xover although you do have to own a measurement equipment to see the changes.
It is so easy to choose between diffrent filters, xover points, slopes. You can EQ frequency response, it is easy to blend the sytem with extra subwoofers. Really I cant see any disadvantages apart from the cost. And you dont have to know how to design passive xover although you do have to own a measurement equipment to see the changes.
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This weekend I am finally changing my x-over in my clone (currently a modified Proac xover) to the ATC version shown here: http://www.diyaudio.com/forums/mult...atics-clone-atc-scm-100-a-13.html#post3026299
Very curious to see the differences. The only thing I will have to fiddle with is the T-Pads for the mid and tweeter, since I have the less efficient mid - I may even not need it for the mid! Would rather avoid having the signal go through resistors...
Very curious to see the differences. The only thing I will have to fiddle with is the T-Pads for the mid and tweeter, since I have the less efficient mid - I may even not need it for the mid! Would rather avoid having the signal go through resistors...
I have my own passive versions with the crossover to the mid at 700hz and the tweet at 3.5k and I can tell you they sound better that the Active's I have done side by side comparison with 2 other friends and the vote was unanimous. The midrange is the best I have ever heard form any speaker. I use the Scan BE tweeter up top and the highs are sublime. The speakers also sound great with just 80 watts of valve power and just get better as you climb the amplifier chain.
Anyone interested in this thread might also be interested in my two ATC boards on Pinterest.....
First, a board that holds my collection of research on ATC speakers (and a few other bits and bobs):
https://uk.pinterest.com/TheTrike/atc-my-inspiration-for-my-atc-pa65-scm150aslt-conv/
Second: my build project:
https://uk.pinterest.com/TheTrike/atc-loudspeakers-pa65-atc-scm150asl-recording-stud/
First, a board that holds my collection of research on ATC speakers (and a few other bits and bobs):
https://uk.pinterest.com/TheTrike/atc-my-inspiration-for-my-atc-pa65-scm150aslt-conv/
Second: my build project:
https://uk.pinterest.com/TheTrike/atc-loudspeakers-pa65-atc-scm150asl-recording-stud/
Hi Hugo
I built the Wilmslow Audio K50 kit earlier in the year (based on the SCM50) and the bass is plentiful. I really don't see what a subwoofer would add - the bass extension is superb.
My kit was purchased before they switched to using a Volt mid-range driver. It would be worth contacting them to see if the crossover has been revised as the Volt and ATC mid-ranges have different recommended crossover frequencies.
Thanks
Chris
Hi Chris,
thanks, I already got hold of a pair of those ATC mid drivers second hand and ATC 12" bass driver.. so I should come close
gonna listen to some SCM100ASL in out local hi-fi shop next week.
from there I'll take my decision if I give it a go or sell the chassis and keep looking .. thank you
have you ever had the chance to compare to real ATCs SCM50?
does the Wilmslow Kit come close?
no i got all drivers and filters from atc ,filters are upgraded with Jantzen silver z caps and superes resistors ,with that upgrade it sounds better than the active versions
You're lucky.. they don't do that anymore nowadays.
Would you mind to share pictures? Maybe you even have schematics of this?
Highly appriciated
No I haven't been able to compare. I'd be surprised if they sound significantly different given that the K kits were designed with input from ATC.
The mid driver and tweeters are both closed-back units so I would think the cabinet has minimal influence on the performance of those. The positioning and alignment of all drivers looks to be similar to the SCM50.
It would be interesting to compare the crossover schematic with that of the genuine article.