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Old 4th September 2006, 08:38 PM   #1
Empee is offline Empee  Netherlands
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Default Cabinets for Philips AD3800AM ?

Hello to you all!


Ive been reading your stories as a guest for a long time but today I finally hit the subscribe button.
Why ? because I am on the verge of beginning a new project and Id like some advice.

First a small and brief introduction of me and my audio-background:
I used to play with big P.A. amplifiers and ditto speakers (used to??? o.k. I still do),
I build several P.A cabinets (such like rear-loaded scoops and Keeles W-horns), but for my home situation
Ive always had standard, off-the-shelf, sort-of-like hifi stuff.

Now for a few months, I own a 1964 Philips HF306/309 amplifier-kit, a pre-amp and two 10W monoblocks.
These are end-transformer-less, so theyre driving 800ohm AD3800AM speakers.
For these speakers, I do not have the original cabinets so I mounted them in some old square boxes I had lying
around but the sound must get better than this.

So Im looking for a nice design to put the AD3800AMs in !

Anyone got suggestions ?

Thanks in advance,

Empee

Philips Ad3800AM:
Alnico magnet, 6Watts, 800ohm, 72 18.000Hz, baffle opening 180mm


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Old 28th April 2014, 11:02 PM   #2
adam2a3 is offline adam2a3  Greece
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Default cabinets

Hi, several years passed after your post regarding AD3800AM Philips drivers. Have you built the right boxes? I have some cabinet dimensions coming from Philips book (I just finished a pair).
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Old 29th April 2014, 08:15 AM   #3
Empee is offline Empee  Netherlands
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Default Several years....

Hi Adam,


Incredible, after 8 years finally a reply to my very first post on DIYaudio

Man, what a noob I was. I think I never even had heard of t/s parameters !
what I did in the meantime was learn, build, learn, build, learn.....

What I did with the AD3800AM's ?

First off, some old man tried to teach me the basics of speakerbuilding and the properties a driver has, or hasn't.
On his advice, I made some quick 'n dirty open back (guitar-amp-style) speaker cabinets.
Not much bass but really enjoyable to listen to ! These drivers have a midrange that's really very, very good.
They image quite well

later on, I wanted more bass (and still use the 800ohm monoblocks), and I build some HUGE voight pipes...
Those were fun. How low can you go with a crappy driver ?! well, build Voight pipes as large as you can and smile forever....

But, When I had to move the Voight pipes had to go. They simply didn't fit my new house.
By then I had learned something about tube amplifiers and fitted output transformers to these monoblocks,
so I could use 8ohm speakers. I sold the AD3800AM's.


BUT WHAT A COINCIDENCE YOU REPLIED TO MY OLD QUESTION:
as last week I bought a pair of AD3800M, the 8 ohm version,
just "for old times sake" (they were 5 euro's for the pair!)

...I was thinking of putting them in open baffles...

tell me all about you cabinets and what you think of the sound quality !
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Old 29th April 2014, 08:57 AM   #4
GM is offline GM  United States
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Yeah, with no specs, not much anyone can say, though I did find this design in a quick search: http://forum.zelfbouwaudio.nl/downlo...5698&mode=view

GM

edit: OB: http://diyaudioprojects.com/Gallery/...ffle-Plans.jpg
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Last edited by GM; 29th April 2014 at 09:05 AM.
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Old 29th April 2014, 06:46 PM   #5
Empee is offline Empee  Netherlands
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LOL !!

inspired by this posts, I looked for old pictures of my Voight pipes...

remind you, it's been 8 years

ah yes,
when I was single....
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Old 29th April 2014, 06:47 PM   #6
Empee is offline Empee  Netherlands
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DSC00116.JPG

DSC00125.JPG

DSC00136.JPG
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Old 30th April 2014, 06:11 PM   #7
GM is offline GM  United States
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Old 1st May 2014, 01:37 AM   #8
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This was fun to read. Those pipes are big! I'd consider OB for your drivers. I love OB. I'd suggest 19" square baffles sitting on top of H-frames for bass support. It'd be a bit smaller than the pipes.
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Old 13th May 2014, 01:18 PM   #9
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Hi, you could also find the original Philips cabinets AD5038 or, with a little modify, the AD 5045 born for the bigger 9710AM speaker. I one pair of each model Click the image to open in full size.
Attached Images
File Type: jpg DSC04578.JPG (720.5 KB, 25 views)
File Type: jpg DSC04580.JPG (671.1 KB, 23 views)
File Type: jpg DSC04581.JPG (821.6 KB, 12 views)
File Type: jpg DSC04584.JPG (689.9 KB, 10 views)
File Type: jpg DSC04585.JPG (707.7 KB, 11 views)
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Old 13th May 2014, 01:44 PM   #10
IG81 is offline IG81  Canada
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Most of these Philips drivers tend to have T/S parameters that favour somewhat large sealed enclosures (still as compact as you're likely to get with these), probably even larger if vented, or gigantic TQWP or Voigt, as per the above pictures. The larger one, 10" or 12" should give a decent account of themselves on large OB's. I like the Philips AD5200 OB design, linked to above by GM, though I've never tried it myself. I've worked with the 8" AD9710/M8 and still have the 6" AD7060/M8. Parameters for relatives of these usually seem not to stray too far; mid/hi Qt, 0.45-0.65 or so, Fs in the 40ies and large-ish Vas. Sensitivity is good and the top-end can often exhibit a shelf, so-called "hot" treble. Here's what my similar AD7060/M8 is like:

Re: 7.7 ohm
Fs: 44 Hz
Qms: 3.01
Qes: 0.62
Qts: 0.51
Vas: 50 liters (a bit fudgy to measure, should be close enough IMHO)
Sd: 133cm^2
BL: 4.75 N/A (WinISD extrapolation)
SPL: 90.4dB/W/m (WinISD extrapolation)

Click the image to open in full size.

(disregard response below ~600Hz...)

Click the image to open in full size.

The huge HF shelf does smooth-out quite nicely when ~20-30 off-axis and extension remains good.

Last edited by IG81; 13th May 2014 at 02:02 PM.
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