New cabinets for Altec 416a

angeloitacare · 11:27 AM

i got recently a good deal of two pairs of altec 416a's. Since i heard Onken W's in italy, it was my wish to try out something similar in my system. Today i came up with this drawing. With these dimensions, internal cab volume is about 300l.

Any comments ?

Pano · 4th January 2012, 08:40 PM

Is it a sort of rear loaded horn?

angeloitacare · 4th January 2012, 08:43 PM

Quote:

Originally Posted by Pano

Is it a sort of rear loaded horn?

Yes, something between a backloaded horn, and bassreflex.

Pano · 4th January 2012, 08:47 PM

OK, that what it looks like - a combo. Maybe GM will have something to say. I have no idea how well it would work.

cyclotronguy · 4th January 2012, 09:27 PM

Hmmmmm Altec meets RCA.

Jmmlc · 5th January 2012, 07:01 AM

Hello Angelo,

Without numbers it is hard to say but the frequency at which the vents tune the box seems to be very different than the cut-off of that truncated horn. I'll imagine the horn will provide no acoustic load at that tuning frequency.

In conclusion apart the shape of inner volume of the box which seems good in reducing internal reflections, the enclosure as it is designed will act purely as a bass-reflex.

(But it is a nice Onken-Jensen style bass-reflex) .

Best regards from Paris, France

Jean-Michel Le Cléac'h

angeloitacare · 5th January 2012, 07:25 AM

Quote:

Originally Posted by Jmmlc

Hello Angelo,

Without numbers it is hard to say but the frequency at which the vents tune the box seems to be very different than the cut-off of that truncated horn. I'll imagine the horn will provide no acoustic load at that tuning frequency.

In conclusion apart the shape of inner volume of the box which seems good in reducing internal reflections, the enclosure as it is designed will act purely as a bass-reflex.

(But it is a nice Onken-Jensen style bass-reflex) .

Best regards from Paris, France

Jean-Michel Le Cléac'h

Hello Jean-Michel

the primary idea is to use it indeed as bass reflex, just in a different shape than the regular Onken enclosure, to meet my demands. Which are wider vertical dispersion through the vents , and mantain the internal volume of the Onken, to get similar performance. In that case would you suggest to take off the internal wave guiding walls, which would give a shape similar to a horn ?

Angelo

cyclotronguy · 5th January 2012, 06:02 PM

Angelo

Given the tuning of the vents, I would expect very little if any vertical dispersion enchantments. Unless of course you make the thing tall enough with respect to it's environment to gain boundary loading effect... and then only at low frequency.

Then again we are discussing the mighty 416a, which while a very fine device; it is my no stretch of the imagination a low frequency transducer in the modern sense.

Cyclotronguy

4th January 2012, 11:11 AM	#1
angeloitacare diyAudio Member Join Date: Sep 2006	New cabinets for Altec 416a i got recently a good deal of two pairs of altec 416a's. Since i heard Onken W's in italy, it was my wish to try out something similar in my system. Today i came up with this drawing. With these dimensions, internal cab volume is about 300l. Any comments ? Last edited by angeloitacare; 4th January 2012 at 11:27 AM.

4th January 2012, 09:27 PM	#5
cyclotronguy diyAudio Member Join Date: Sep 2001 Location: Northern California	Horn Hmmmmm Altec meets RCA.

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4th January 2012, 08:40 PM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Is it a sort of rear loaded horn?

4th January 2012, 08:47 PM	#4
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	OK, that what it looks like - a combo. Maybe GM will have something to say. I have no idea how well it would work.

5th January 2012, 07:01 AM	#6
Jmmlc diyAudio Member Join Date: Oct 2005	Hello Angelo, Without numbers it is hard to say but the frequency at which the vents tune the box seems to be very different than the cut-off of that truncated horn. I'll imagine the horn will provide no acoustic load at that tuning frequency. In conclusion apart the shape of inner volume of the box which seems good in reducing internal reflections, the enclosure as it is designed will act purely as a bass-reflex. (But it is a nice Onken-Jensen style bass-reflex) . Best regards from Paris, France Jean-Michel Le Cléac'h

5th January 2012, 06:02 PM	#8
cyclotronguy diyAudio Member Join Date: Sep 2001 Location: Northern California	Angelo Given the tuning of the vents, I would expect very little if any vertical dispersion enchantments. Unless of course you make the thing tall enough with respect to it's environment to gain boundary loading effect... and then only at low frequency. Then again we are discussing the mighty 416a, which while a very fine device; it is my no stretch of the imagination a low frequency transducer in the modern sense. Cyclotronguy

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