Any ideas for DIY build with these Philips? - diyAudio
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Old 15th February 2014, 08:52 PM   #1
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Default Any ideas for DIY build with these Philips?

Picked up a similar pair of these at a church rummage sale for $5. Who has any ideas/ plans on what type of small 1st time project I could do with these drivers, OB, fullrange etc.?

http://www.canuckaudiomart.com/detai...shelf_speakers[
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Last edited by folkie13; 16th February 2014 at 04:01 PM. Reason: tried removing broken link
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Old 15th February 2014, 08:59 PM   #2
sreten is online now sreten  United Kingdom
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Hi,

Never cut and paste a link with dots in it, it never works.
Use the link and cut and paste the full address from the bar.

rgds, sreten.
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Old 15th February 2014, 09:00 PM   #3
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Your link is broken. Just post what they are, size, model numbers etc.

jeff
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Old 16th February 2014, 01:34 PM   #4
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My apologies. I thought that link worked fine .

They are a small bookshelf type speaker, even have a hole on the back to hang them on a wall. They say Type 22 RH 491 made in Holland the mid/woofer is AD7065/W8 It is a paper cone with a rubber surround.

I thought they felt quite heavy for the size of speaker so took a chance and got them that I might try a 1st time build and see if the DIY bug will infect me.

Thanks in advance

PS.I will attach a couple photos from my old cell phone.(sorry about quality)
Attached Images
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File Type: jpg hifi2.jpg (97.8 KB, 199 views)
File Type: jpg hifi1.jpg (110.4 KB, 198 views)
File Type: jpg hifi5.jpg (304.8 KB, 196 views)
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Old 16th February 2014, 03:53 PM   #5
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Remember being a newbie I am learning about things like ideal cabinet volume, dampening materials etc. My goal is DIY and not just using something off the shelf but to modify and have the enjoyment of building something myself.

So with that in mind. Any ideas then if I keep them as 2-ways(if the drivers aren't suitable for FR or OB) on a new cabinetry designs(something more interesting visually and sonically equal to or an improvement on the present boxes)? This way I can at least get my hands wet in building speakers and learning from my mistakes in an economical way.

Second, is there a downloadable program that you guys recommend for taking measurements of your projects sonic specs by using a good mic and recording playback through your speakers?

Last, since I posted this in fullrange is there a way it should/can be shifted to the proper forum if the best suggestions are to keep using these drivers in a 2-way config?
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Old 16th February 2014, 04:31 PM   #6
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Default Philips 22 RH 491 specs

Specifications:

Load: 20 Watt
Impedance: 8 Ohm
Frequency response: 55 - 20,000
Crossover frequency: 1.500Hz
Resonant Frequency: 70Hz
Speaker Units: AD0160 / T8, AD7065 / W8
Capacity: 7 liters
Dimensions: 300 x 230 x 180mm

Also mentioned was the following which is above me and is in French

the Thiele-Small parameters for AD7065/W8 are at:


Paramètres haut-parleur de THIELE et SMALL, sans filtre ni ampli
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Old 17th February 2014, 02:36 AM   #7
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That french page looks like a " spreadsheet" and it's very long indeed.
All of that data are derived from the data taken by measuring the driver alone, which needs a set like sweep generator for finding the Fs, but with Pcs it's much easier, and with a Dayton DATS even more.
So from the data reported on the back you have a 70 Hz box which usually means the F3 point...also 20 kHz will predictably be played at -3 dB
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Old 19th February 2014, 05:39 AM   #8
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I see that the F3 point is 55 Hz ! Which is the same as in the tables shown in that site.
Going bigger 8-12 l can lower the resonant frequency and using a port adds an extra octave. Going much bigger, also...
I usually design the box around the woofer leaving the tweeter external, which can be put even below the woofer, and usually in axys.
A quick ear test if the tweeter performs satisfactorily and an eye on the parts of the crossover, or viceversa
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Old 19th February 2014, 07:22 AM   #9
DrBoar is offline DrBoar  Sweden
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The Q of 0.3 and a Fr of 41 Hz strongly suggest a bass reflex box. The various tunings of a bass reflex box give a box volume of 7-10 L. With the serial resisistance of the coils a box a bit larger. Philips paper cone woofers are generally good with no nasty peaks in response that need a complex crossover. The tweeter is not bad either, the problem with that one is that it is very easy to mount them wrong and get bad results
WWDT
So flush mount is the thing you need one way or the other.
I would keep the crossover values but replace the electrolytic caps with the same values using cheap plastic film caps from Parts-Express or a similar vendor. I am sceptical about those fancy expensive caps in general and especially in the context of a budget project.
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Old 19th February 2014, 08:24 AM   #10
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@folkie,

my english is not the best. but what´s about with an Open baffle? these drivers work´s very good with it.
In the german HiFi-Forum are a lot projects HiFi-Forum - größte deutsche Community für Unterhaltungselektronik
if you need there some help,write and ask.
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