Philips AD4000M Cabinet Suggestion;

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starbender

starbender

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Joined 2012
#1
As title says, I need cabinet suggestions for my 10" AD4000M alnico full rangers.

I made 139liter closed box filled with fiberglass by myself to test drivers. Final result is quite nice, for my ears at least. These drivers are spec'ced for max 10W. But ofc I don't have any driver measurement data to build proper box.

Sound character is lively, fast, bass is not boomy, but it's poor. Hf is sometimes edgy, especially vocals. As I read, this is the result of whizzer cone.

I found old official philips box suggestions, but there is no closed box design, only ported. For a second experiment I made official ported design. At ported design bass notes are somehow boomy, drivers loses its pace and balance.

Found this;

High sensitivity class, these 10-inch broadband speaker has a 8000 gauss magnet, 97,600 Maxwell and a double cone. Return is 6%. This speaker was part of the Philips Crown Series.
Originally, the diameter of the treble cone was 86 mm, 96 mm later. The sound was so different and the sensitivity decreased some.
In 1969, this type is replaced by Philips AD1050 / M7 .


Resonance fq : 50
Response : 50-18000hz
Impedence : 7ohm
Pdiss : 10
​


I'm planning to build another box. I know, there is not enough measurement data. But I think these drivers can do a lot better with proper box. I don't have a chance to build open baffle because of WAF issues..

Any suggestions? Or experience?

Thanks
 
#2
Most Philips drivers tend to do well enough in sealed alignments. That 139L sealed box sounds like a good enough shot in the dark guess if I may say so; sounds like you were enjoying it for the most part. About that weak bass, did you run any baffle-step compensation? That and room placement could be all you need. About the "edgy" vocals, perhaps listening a bit more off-axis could help with this, as these driver often have an elevated HF plateau that I've found to give such an effect when listened to dead-on.
 
#3
Sure, I'm enjoying 4000M's.. Sounds incredibly lively. That's why I'm searching for 'more' suitable box design.

I never heard that 'baffle-step compensation'. I read Mr.Murphy's article. It's interesting. Looks easy to test&check.. Thanks 😉
 
#4
Yeap, a simple little passive circuit can help a ton towards making a fullrange sound fuller. This can also be done at line-level before the amplifier.

If you'd be willing to go to a much larger enclosure, some sort of old-school Voigt-TQWT type box might be awesome. I've always had this in the back of my mind for the 9710 and AD7060 I used to own, but never went for it.
 
#5
IG81 said:
Yeap, a simple little passive circuit can help a ton towards making a fullrange sound fuller. This can also be done at line-level before the amplifier.

If you'd be willing to go to a much larger enclosure, some sort of old-school Voigt-TQWT type box might be awesome. I've always had this in the back of my mind for the 9710 and AD7060 I used to own, but never went for it.
Click to expand...


If I go for a much larger enclosure, my wife probabbly put me in another enclosure 😀

Will try baffle-step conpensation.. and report 😉
 
#7
Here are T/S Parameters for the AD 4200M (AD 1050/M7):

Re: 5.218
Fs: 50.47
Qts: 0.842
Qes: 0.972
Qms: 6.3
Le: 0.928
Mms: 23.86
Vas: 70.25

Someone can use those to help you create a suitable enclosure. If it's like other Philips drivers of that type, it will have an Xmax of about 0.9mm
 
#11
starbender said:
GM, I have the complete factory cabs book. There is no closed box for 4000m. Maybe there is a reason for no closed box. Don't know. Open baffle out of the question (sadly).. Waf issues..
Click to expand...

Cool! I didn't look at the drawings, just the titles, but if your specs are typical from when they were new, then I'm surprised.

Bummer, WAF has never been an issue for me WRT my various huge horn speaker systems, though one did take exception to using the living/listening room to repair/prep/store the cycles over the Winter in anticipation of Daytona Bike Week back when the garage was a race shop.

Frankly, I didn't have a clue what SAF, WAF, S.O. meant when I got on-line as I didn't/don't know anyone with this issue. Guess I 'run' in all the 'wrong' crowds, though of course most needed to be finished to complement the decor or hidden behind decorative screens like I did. 'Man caves' of course was the exception.

GM
 
#14
GM said:
Cool! I didn't look at the drawings, just the titles, but if your specs are typical from when they were new, then I'm surprised.

Bummer, WAF has never been an issue for me WRT my various huge horn speaker systems, though one did take exception to using the living/listening room to repair/prep/store the cycles over the Winter in anticipation of Daytona Bike Week back when the garage was a race shop.

Frankly, I didn't have a clue what SAF, WAF, S.O. meant when I got on-line as I didn't/don't know anyone with this issue. Guess I 'run' in all the 'wrong' crowds, though of course most needed to be finished to complement the decor or hidden behind decorative screens like I did. 'Man caves' of course was the exception.

GM
Click to expand...

Regarding of WAF;
maybe because I had gear all over the place in da house 🙂
Not every one of us lucky as you. :headbash:
 
#16
starbender said:
Regarding of WAF;
maybe because I had gear all over the place in da house 🙂
Not every one of us lucky as you. :headbash:
Click to expand...

I did/do too and yes, lucky WRT being born in a locale where even apartments tend to be a bit larger than the average home around the world, so larger systems don't take up as much living space, but luck had nothing to do with me choosing friends, mates that share my passion for musical reproduction at near live levels over room decor/whatever.

Times are changing around here though, newer apartments, house rooms have been shrinking in the past decade and HTiB systems have become the norm, so apparently I'm part of a dying breed in more ways than one.

GM
 
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