I had to put a light coating of diluted rubber cement on my pair since the paper pleating looked quite tired. I managed not to shift Fs doing so. Not certain if it was necessary in your case, unless the paper is really dry and in danger of crumbling, but if the guy did a good job, it should help them last.
IG
IG
they are in very well condition but surrounding paper but I wanted to strengthen their life and preserve them more... I think they will serve another 30-40 years now on
actually I want something not very big because right now I got two pairs of king size horn loaded speakers and I want to build a Trio-like horn in near future
for now I put them into prototype boxes and they sing pretty well. I may build a 3-4wpc 2A3 SE amp for them to use. if you think a certain plan is better I'm all ears
actually I want something not very big because right now I got two pairs of king size horn loaded speakers and I want to build a Trio-like horn in near future
Small is opposite what these drivers ideally want. Philips recommends a 40L reflex and I tried them in a 49L one, tuned to 40Hz IIRC. That worked decently, with a ~2-3dB mid-bass hump that may work in certain rooms, not so well in others. Impulse response might be compromised a bit.
For a sealed box, Qtc=0.707 happens a bit over 100L and Qtc=1.0 is 30L, for the specs of my driver at least. Anything in between could be built and made aperiodic to lower system Q to your taste, but bass will be lean with a high f3, so some kind of helper woofer will be needed.
IG
what about a box with following dimension:
W: 30cm
H: 50cm
D: 30cm
total volume would be ~45L
what is the proper size of the port for this enclosure?
Here is the 45 liters box simulated as both vented to 40Hz (green) and sealed (blue).
May I suggest golden ratio dimensions of 22cm x 35.5cm x 57.5cm for this enclosure? It's better to avoide the two 30cm dimensions, at least in theory. I don't know what is easily available to you for making ports, but I'd go with a 3" ABS pipe, which would require 5.25" of lenght, or a 4" pipe that would then need to be 10.325" long.
Here's these 49L boxes I made, don't mind the tiny front port, which was quickly replaced by a 3" pipe in the back.
IG
May I suggest golden ratio dimensions of 22cm x 35.5cm x 57.5cm for this enclosure? It's better to avoide the two 30cm dimensions, at least in theory.
I don't know what is easily available to you for making ports, but I'd go with a 3" ABS pipe, which would require 5.25" of lenght, or a 4" pipe that would then need to be 10.325" long.Here's these 49L boxes I made, don't mind the tiny front port, which was quickly replaced by a 3" pipe in the back.
An externally hosted image should be here but it was not working when we last tested it.
IG
Attachments
Here is the 45 liters box simulated as both vented to 40Hz (green) and sealed (blue).
May I suggest golden ratio dimensions of 22cm x 35.5cm x 57.5cm for this enclosure? It's better to avoide the two 30cm dimensions, at least in theory.
Here's these 49L boxes I made, don't mind the tiny front port, which was quickly replaced by a 3" pipe in the back.
An externally hosted image should be here but it was not working when we last tested it.
IG
Uh thankyou very much
I really appreciate youvery useful info
it would be a pretty big bookshelf but a nice-sounding oneI don't listen to music at wall-shacking levels and most of the time Jazz, Blues, Folk and some Soundtracks
so I don't think an additional woofer is necessary. I can crack up my Cornwall if I need some earthquake 
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