What to do with a Philips AD9710 fullrange

[boessenkool]

Hi,

I'm in the proces of buying a Philips AD9710 fullrange driver.
I have found some information on this driver at:
http://www.sitecenter.dk/otc/nss-fol...lipsfullrange/
http://www.dhtrob.com

AD 9710 parameters:
Diameter: 8.5", 20.3 cm
Efficiency: 97 dB SPL @1m, 2.83v, 8R
Re: 5.2R
Z: 7R
Fs: 46 Hz
Qms: 2.28
Qts: .63
Qts: .49
Vas: 3.55 ft^3, 100 l
Pe: 15W
Xmax: +- .7mm

My goals are, at least for now:
1 - Fulrange: about 50 Hz to 10-15 kHz
2 - Perhaps later a tweeter (after hearing the first trial)
3 - Not to big a box (about 100 liter inside)

The possibilities as far as I see and after using Boxplot etc:

A - Closed box: Not enough bass respons (System compliance .707 => 140 liter)
B - Ported 1: Standard alignment results in a 190 liter enclosure!
(system compliance .527)
C - Ported 2: put it at 100 liter and a resonance frequency of
aprox. 40 Hz. Seems ok, but as far I understand the transient response suffers a lot.
D - Open baffle: Result in a large room-devider (WAF!)
E - TQWP / TML Seems to be very promising: But..............
I do not know how to make a educated guess for a design. I've
been to t-linespeaker.org (great site!) and the only not emperical stuff are the models of Martin King
(also great stuff, difficult though).
But the demo version of the Mathcad 8 won't properly
work on my computer.
Furthermore applying the essence of his Mass Loaded TQWP FE164 design, will result in this case in a very
large box, because of the needed end surface.

So I need some help, what to do with this driver?

Luuk Boessenkool - NL

[planet10]

Originally posted by boessenkool
Vas: 3.55 ft^3

It has a big Vas, it is going to want a big box.

dave

[halojoy]

For those, who not know:

Philips AD9710 is a real classic woofer.
Has been around for a long long time!!!
Gives a lot of sound pressure out: 97dB SPL (at 1 kHz I would think)
This driver is often used by Musicians.

A very interesting Loudspeaker Element
And the cost is very low, at least in comparision

[halojoy]

And into the 70ies.

First in this "kol-box", kol=carbon
History of OA Carlsson Speakers - kolboxen

OA (Carlsson) build the most sold Loudspeaker EVER in Sweden!
in the 1960ies
I know, for my brother had them. You could see those boxes in
nearly all Swedish homes. Standing in the corners.
My brother had this white Type II :
SONAB OA5 Type II

SONAB OA5 - it had 9710, 8 ohm variant, and 4 diskants, tweeters, radiating at all 4 sides
SONAB OA5
--------------------------------------------------------------------

Imaging this Fullrange Driver was around in the Beginning of 1950ies.
50 years later, a guy is going to use it in a speaker system.

How many will use Windows XP, 50 years from now?????????????
Or listen to Britney Spear Music???

/halojoy - will never know the answer, unless he will become very old

[Jaap]

Try to find the Philips publication: "luidsprekerbehuizingen voor zelfbouw" (loudspeaker-enclosures for diy).
It has several designs for the 9710.

You can also stick the 9710 on an open baffle: not bad at all.

Jaap

[halojoy]

Originally posted by Jaap
Try to find the Philips publication: "luidsprekerbehuizingen voor zelfbouw" (loudspeaker-enclosures for diy).
It has several designs for the 9710.
You can also stick the 9710 on an open baffle: not bad at all.
Jaap

Jaap should know rather good,
Philips is A Netherland company
from the beginning
Now, it is more multi-national.

Am I right, Jaap?

halojoy - is not always right

[LaMa]

Originally posted by halojoy

Jaap should know rather good,
Philips is A Netherland company
from the beginning
Now, it is more multi-national.

Am I right, Jaap?

halojoy - is not always right

I would call it a Dutch multinational

[sangram]

Can I see pictures?

I think I just picked up one of these units for my guitar combo amp, and I've seen this in systems from the 70s onwards. I suspect the ones we get around here have ceramic magnets, with hexagonal sheet metal chassis. Not the round chassis as shown in some links.

But is a full range driver with a whizzer cone, very nice sound for instruments. I have also seen these used with some mid-fi systems in the early 70s. 93-94 dB sounds about right, these guys can play LOUD!

Haven't used them in a while, though might again, they're really cheap, play well and are a good FR option.

One more question. All applications I've seen recommend that the driver be mounted from the rear of the baffle, as opposed to the front. Any particular reason why? There is a very thick rubber washer for this purpose. I do not like to have removable rear panels. Unless it's open baffle. I find the speaker in open baffle such as in my small combo cube, have decent lows, enough for bass guitar maybe so I may consider similar WM configuration for monitoring purposes.

[Pjotr]

Hi,

The Philips AD9710-M (M = extra mid cone or dual cone) is a real classic. It is one of the best speakers Philips has ever made. But I have never seen these with ferrite magnets. All have Alnico magnets.

One of my first big projects was a Karlson resonator (NOT Carlsson!) with a AD9710-M. This Karlson box was build according to the plan in the book “Luidsprekers”. A more than 30-year-old book from “De Muiderkring”, publisher of a Dutch radio DIY magazine “Radio Bulletin”.

This was a really good sounding box that could produce powerful deep bas with a moderate 15W amp. But in the mids and highs it produced a fair amount (but not unpleasant) coloration. Later I build several other ones for small PA. But nowadays it is not worth the effort to build such a complex box IMHO.

Here is the plan of the Karlsons I build with de AD9710-M those days (430 kb):

http://home.student.utwente.nl/e.j.j...ns/new12in.gif

It is from the Karlson Homepage

If you Google on karlson+loudspeaker, there is a load of information about this remarkable design.

But for music instrument use I would suggest to mount the AD9710-M on an (folded) open baffle nowadays. But if you build a Karlson resonator according to the plan given, you will not be disappointed if you put an AD9710-M in it.


Cheers

[Jaap]

I am glad to see that you all talk about the Philips company.
Most yankees are constantly talking about a certain Phillips company I have never heard of

Jaap,
who is of course of Dutch origin and thinks that certain Philips product were underestimated in the past, and who tells you that the recent Philips DVD 963SA is a killer machine for the price they ask for it.