Hi !
I know there's been some talking about this but I
cannot seem to find any workable conclusions...
So my question is;
Can a J-bin / Scoop as used in PA, be made with a 12" driver ?
Off coarse it can, but will it work ?
Now I'm posting this in the Fullrange-forum, as I intend to make
a hifi-sorta scoop using the ol' Philips AD12202.
A terrific fullrange 12" although I'm a little worried of the high-ish
total Q (being somewhere in the range of 1.2 I guess)
My thoughts are as follows;
If I were to scale down the original J-bin, I'd alter the hornlength,
pushing the lower horn cut off frequency up.
But isn't it smarter to just narrow the design,
so keeping the hornlength the same ?
And if this is a way to go, how much would it be narrower ?
Maybe some of you backloaded-horn-masters can help me with
this please ?
Cheers,
Empee
I know there's been some talking about this but I
cannot seem to find any workable conclusions...
So my question is;
Can a J-bin / Scoop as used in PA, be made with a 12" driver ?
Off coarse it can, but will it work ?
Now I'm posting this in the Fullrange-forum, as I intend to make
a hifi-sorta scoop using the ol' Philips AD12202.
A terrific fullrange 12" although I'm a little worried of the high-ish
total Q (being somewhere in the range of 1.2 I guess)
My thoughts are as follows;
If I were to scale down the original J-bin, I'd alter the hornlength,
pushing the lower horn cut off frequency up.
But isn't it smarter to just narrow the design,
so keeping the hornlength the same ?
And if this is a way to go, how much would it be narrower ?
Maybe some of you backloaded-horn-masters can help me with
this please ?
Cheers,
Empee
Attachments
Hi !
hmmm, ok, I get your point
Seems there is no alternative then to try to measure Qts myself
Do you have any methods you'd like to recommend ?
I got some more speakers I'd like to measure so it would make
a nice session. Next weekend I'll have the time to do this...
By the way;
the "recomended enclosure" by Philips is "bassreflex or hornloading",
so I guess Qts isn't that high afterall...
Cheers,
Empee
hmmm, ok, I get your point
Seems there is no alternative then to try to measure Qts myself
Do you have any methods you'd like to recommend ?
I got some more speakers I'd like to measure so it would make
a nice session. Next weekend I'll have the time to do this...
By the way;
the "recomended enclosure" by Philips is "bassreflex or hornloading",
so I guess Qts isn't that high afterall...
Cheers,
Empee
Huh?! I see it as a white background with large enough, high contrast black characters in Mozzilla Firefox.
Anyway, no, I don't believe it will perform well in a BVR, at least not by my standards, so as always YMMV.
I'll have to get back to you later with a design if no one else helps in the meantime.
GM
Anyway, no, I don't believe it will perform well in a BVR, at least not by my standards, so as always YMMV.
I'll have to get back to you later with a design if no one else helps in the meantime.
GM
Empee said:
Greets!
You're welcome!
Well, after looking at the specs I'm not sure how much help I can be due to the way they spec'd Qes, Qms, Qts since I don't know how to convert them to free air measurements.
For sure if I use the 80 L (presumed) sealed box measured specs, the TL will be fairly large at ~10.514 ft^3, but I assume the free air specs will be less, though I don't have a clue how much less, so FWIW (all dims i.d.):
L = 66.5"
CSA = ~324"^2 (recommend 22.875" W x 14.125" D)
zdriver = 26.56"
port = CSA at bottom
stuffing density = 0.6 lbs/ft^3 simmed
GM
Attachments
Hi GM !
as always, thank you very much for your reply and sims !
However,
I decided to store these drivers until I got the room for a
pure open baffle, like all people I ask advise me.
I think the BIG Jalabert baffle will be the way to go, like
here
They are actually smaller than the Hemp BiB's I got now
I guess I'll take on another speaker-project to keep me buissy...
I got some Philips AD1065's but these also show a high Qts.
Last week I also obtained two 8" fullrangers by a German
brand called EAL (Electro Acoustic Leipzig), but I do not have
their specs yet...
They sound pretty good in a cardboard box (quick testbox) so
maybe they can be impemented in a BVR/horn like these
Cheers !
Empee
as always, thank you very much for your reply and sims !
However,
I decided to store these drivers until I got the room for a
pure open baffle, like all people I ask advise me.
I think the BIG Jalabert baffle will be the way to go, like
here
They are actually smaller than the Hemp BiB's I got now
I guess I'll take on another speaker-project to keep me buissy...
I got some Philips AD1065's but these also show a high Qts.
Last week I also obtained two 8" fullrangers by a German
brand called EAL (Electro Acoustic Leipzig), but I do not have
their specs yet...
They sound pretty good in a cardboard box (quick testbox) so
maybe they can be impemented in a BVR/horn like these
Cheers !
Empee
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