I have a pair of Philips AD12202 M8 which I plan on installing in a pair of re-purposed modified Tannoy cabs with a volume of 100L (were 200L) and internal dimensions of 85 (h) x 45 (w) x 26 (D) cm.
I also slightly flared PVC ports 9 cm internal diameter and 20 cm long.
Now, I've calculated port length using some on-line tools and given tuning of 30Hz have had results ranging from 13.6 to 21 cm long for the port, although most were at the lower end (~14.6 cm ish)
Which one should i believe?
I also slightly flared PVC ports 9 cm internal diameter and 20 cm long.
Now, I've calculated port length using some on-line tools and given tuning of 30Hz have had results ranging from 13.6 to 21 cm long for the port, although most were at the lower end (~14.6 cm ish)
Which one should i believe?
The "M" in the unit indicates that it's a "full-range"/mid loudspeaker.. The maximum exursion the conus can make (Xmax) is very limited compared to a real bass unit (indicated by "W"). The unit will be able to produce some bass but only at very limited levels...
I'd take care using these kind of units, especially when very low bass is applied. The conus excursion increases fast underneath the resonance frequency of the port due to an acoustical short-circuit....
I'd take care using these kind of units, especially when very low bass is applied. The conus excursion increases fast underneath the resonance frequency of the port due to an acoustical short-circuit....
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Hmm, ignoring any flaring, I calc a 13.5 cm long vent with math that's accurate enough for basic vented alignments and with a slight flare it will need to be a bit longer, so I'm going with ~14.6 cm long.
GM
GM
I like 14.6 cm too.
re low bass - understood that its a full range speaker, but of the limited info that I have found, low tuning was suggested (i.e. at 30hz). If I were to raise the Hz the port would shorten, so will see how it goes in the first instance.
If anyone has better idea, happy to hear them!
re low bass - understood that its a full range speaker, but of the limited info that I have found, low tuning was suggested (i.e. at 30hz). If I were to raise the Hz the port would shorten, so will see how it goes in the first instance.
If anyone has better idea, happy to hear them!
How much bass are you expecting ?
Your voices will gargle long before you should be worried about damage.
Your voices will gargle long before you should be worried about damage.
I'm not a huge bass head so not looking to shake the house, but a little bit down low would be nice.
They'll have a large BR so can't really give them more than that. Lets see what they do!
Actually playing with them on the bench they sound pretty good all round (i haven't measured them). I definitely won't need an extra high frequency with them.
bjorno - thanks for posting!
So I should aim for slightly bigger cab (144L tuned to ~31.8 Hz) for BR?
Still learning here - slowly deciphering the hornresp information.
So I should aim for slightly bigger cab (144L tuned to ~31.8 Hz) for BR?
Still learning here - slowly deciphering the hornresp information.
Its taken a while, but I've made a start!
Cut down Tannoy cabs for 145L.
I'll make a new front baffle out of timber and glue it onto the ply. Front baffle will be around 70mm think in total. Cabinet will also be braced internally. sides and rear will be painted black and timber front panel will be left with clear varnish.
Cut down Tannoy cabs for 145L.
I'll make a new front baffle out of timber and glue it onto the ply. Front baffle will be around 70mm think in total. Cabinet will also be braced internally. sides and rear will be painted black and timber front panel will be left with clear varnish.
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Just learned about your project... I have the same very fine Philips driver. Currently I am using it in a semi open baffle. In this setting (together with a Philips AD12200w) I can't get the tuning I am searching. I also like to change the looks.
So I am searching for a cabinet just using the Ad12202. I am in for a BR, TQWT, TL, MLTL
In the Dutch DIY forum there is great succes with the AD12100m in a MLTL with a RCL network as a filter. I can't alter this design to fit the 12202 because I don't know how.
I am very curious how this project turns out...I hope you have succes!
R.
So I am searching for a cabinet just using the Ad12202. I am in for a BR, TQWT, TL, MLTL
In the Dutch DIY forum there is great succes with the AD12100m in a MLTL with a RCL network as a filter. I can't alter this design to fit the 12202 because I don't know how.
I am very curious how this project turns out...I hope you have succes!
R.
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