Philips AD12202M8 cabinet questions - diyAudio
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Old 27th September 2015, 09:51 AM   #1
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Join Date: Jan 2012
Location: Leersum
Default Philips AD12202M8 cabinet questions

Right now this Philips driver is sitting in an open baffle but space is limited in my room so I want to make some room. (so I can put more projects in de same place..haha).

There are lots of cabinet design out there and I get a bit confused by them so I decided to pick two possibilities. I Want to build a Closed box or MLTL, but I ran in to some questions.

The driver specs for the AD12202 are measured in a closed 80L box.

Now I know there is something like virtual volume due to filling the box with isolating damping material. So the question is do I build a 80L closed box and fill it up or do I make a smaller box which ends up with a virtual volume of 80L?

Than there is the MLTL enclosure. I can't simulate or design this myself unfortunately. On the Dutch forum the is a design for the AD12100 version but my driver has different specs.
The questions here are: Is there a need for a filter using the MLTL and maybe more important is this a better option than the closed one?
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File Type: jpg AD12202 specs.jpg (241.9 KB, 476 views)
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Old 27th September 2015, 08:12 PM   #2
knarfor is offline knarfor  United States
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I owned a pair of 12202/M8. I used them in an open baffle. BUT!!! I did take measurements. Here they are, the average of the two drivers:

Re.........7.49 Ohms
Fs........43.74 Hz
Qts........0.456
Qes........0.55
Qms........2.665
Le..........0.189 mH (10k)
Mms.......35.19 g
Vas........135.7 L
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Last edited by knarfor; 27th September 2015 at 08:15 PM.
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Old 28th September 2015, 02:40 AM   #3
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Probably doesn't help you very much, but I'm putting together a BR (145L) for a pair of these.
Philips ad12202 M8 port length?
and
Philips AD12202-M8
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Old 28th September 2015, 04:43 AM   #4
ICG is offline ICG  Germany
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The AD12202/M8 doesn't perform that well in a closed enclosure. Yes, precise bass but an f3 of 69Hz isn't that great. I've used the AD12202/M8 in a vented box with 85l, port 10cm diameter and 15cm length. Not ideal but that's what I had laying around at that time. Together with a supertweeter I used that combination for several years and enjoyed quite a lot. If you'd go for a vented enclosure I'd recommend you'd go for ~100l and a 10cm/d and 20cm length port though.

Click the image to open in full size.
(comparison 80l cb vs. 100l br)
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Old 28th September 2015, 07:49 AM   #5
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Hi guys,

I know your are busy with a BR micro dub I replied in your thread asking about the end result and dimensions..

The picture is very small ICG but the message is clear...bigger is better.... 100L is not a problem. So I will look in to that.

R.
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Old 28th September 2015, 08:39 AM   #6
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Quote:
Originally Posted by Xerxes75 View Post
Hi guys,

I know your are busy with a BR micro dub I replied in your thread asking about the end result and dimensions..

The picture is very small ICG but the message is clear...bigger is better.... 100L is not a problem. So I will look in to that.

R.
Not finished yet (its a long way down on the to-do list atm)! The cut-down tannoy cabs ended up being 85x45x39 cm (HxWxD) (internal).

However, I've decided to build some similar in dimensions to those in the second link (~109x34x39~ish cm). I think they built to 147 or 148L with slot port. I'll reduce volume slightly to 145L and keep round port. The reason being is to move the driver up a bit higher - I don't like where it is placed in the tannoy cabs - I'm finding it too low and it will also reduce the overall footprint slightly (a bit narrower and shallower with an increase in height).

I vaguely remember finding a thread on MLTL - perhaps it is the one you are referring to?
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Old 29th September 2015, 07:57 AM   #7
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Hi microdub, I like the the looks of the build of the 148L one out the second link. It that just a straightforward rectangular box? With this rectangular opening it looks like a TQWT or mltl.

An 100L version is tempting because you can create the looks of a big monitor, which I like very much. But if you guys say 140+Litre is even better I will go for that.

My question about "virtual volume" still stays open.. Because if this is the case I can build smaller with the same result.

R.
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Old 29th September 2015, 10:31 PM   #8
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Default AD12202

Hi there
I think a vented smaller box (with damping) will sound better (not measured better) than a bigger closed box
Damping can be altered
No true measurements just ears
Succes
Enjoy
Ronny
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Old 2nd October 2015, 07:52 PM   #9
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Since I can't simulate cabinet designs I took your advice and designed around the mentioned parameters.

But there is a slight problem. The size for the port in your advices is 100MM, I would like to use PVC pipe and the standard size is 90MM outside with a 3mm thickness or 110MM outside with a 3.2mm thickness.
I would like your advice on this slight issue...

In the attachment is my design.. the internal volume of this design (without damping) is 104L With the mentioned port of 100mm diamater with a length of 200mm.
I hope I am not over asking but would like to read your comments.

R.
Attached Files
File Type: pdf Ad12202 BR cabinet.pdf (6.4 KB, 72 views)
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Old 3rd October 2015, 02:55 AM   #10
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So for a 104L cab - tuned to 40Hz - try 9cm pipe (8.4 cm internal) and 10 cm long.
If you want to tune it lower - 30Hz ~ 18cm long.
If you are using PVC pipe - you can easily alter the vent/pipe length - just wait till you are happy with the sound before gluing it in.
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