Naim DBL - ATC revision/upgrade - diyAudio
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Old 9th October 2012, 09:34 PM   #1
laverda is offline laverda  United Kingdom
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Join Date: Nov 2004
Location: Hampshire
Default Naim DBL - ATC revision/upgrade

Hi

New here but have been DIYing for many years and have made (built) many speakers kits. Some 12 years ago ended up building a 3 way based on the Naim DBL, though successful I have always felt the mid range was lacking for such a hi end speaker. (IMO) For some reason I didn’t get on with these speakers (I was running them passive at the time with a Naim xover) I recall doing some measurements and found the xover points IIRC were 550&2k . And packed them up not to be used again…..but a rekindled interest in hi fi and the fact that I can now run them active could revive them from retirement.

Click the image to open in full size.

They are a SB type (separate box) mechanically decoupled speaker built on a 25mm square steel chassis. The bass enclosure is supported on spikes, which are coupled to the chassis, which in turn is spiked to the floor. The bass ‘chamber’ (L shaped) is fixed to the chassis. Between the Bass Box and the chamber is a mechanical restriction (filter) Similar to that used in the SBL. Thus allowing the bass driver to act as if it’s in a small box but allowing it to resonate into the chamber as if it was in a large box.
The Mid and High drivers are in one enclosure again decoupled from the main ‘L’ chamber via a spikes sub chassis. Each of these divers are mounted on a ‘suspension system’ ….to eliminate box interaction, not sure this works??? I was trying to replicate the Naims theory at the time.

The drivers are :-
ATC 100/375 not sure of the exact model till I get them apart.
Naims own MID, know idea of model or spec & no’s
Scanspeak 2010/851300 tweeter (non ferro)

The plan is to replace the mid….and revise the xover points. The mid is Naims own driver, looks like a KEF B110 but its not with the ATC 75-150 and maybe the tweeter. The easiest way is to make an all new mid high enclosure and to replicate the ATC off set baffle layout.

I’ve already had great info and advise from a member here and another forum (PFM) Thanks Colin but any further info regarding the ATC mid unit would be of help……IE 8 or 16ohms

Graham

Last edited by laverda; 10th October 2012 at 01:57 AM.
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Old 12th October 2012, 05:37 AM   #2
limono is offline limono  United States
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Join Date: Mar 2007
Check Proac EBS (studio 3) crossover , I would start from there. I had this speaker for a while and It's a good allarounder, great with rock ,pop and competent with classical. Dome mid provides vivid. life like and very transparent (I don't like this word but it somehow describes ATC mid ) sound. Proac uses 16 Ohm version . You will probably have to adjust the tweeter level to your taste. Rgrds, L
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Old 12th October 2012, 06:04 AM   #3
laverda is offline laverda  United Kingdom
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Join Date: Nov 2004
Location: Hampshire
Many thanks.....Thats looks almost bang on and as you say a good place to start. With luck I've got/hope to get a pair of ATC 75-150 drivers....in the next few days 16Ohm's which will fit the bill real nice> I've got a pair of Scanspeak 2008's so its may well be only the bass driver I might need to look at....
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