The "usual" way would be like in the help file mentioned:
Of course you can do a backloaded horn and shape the horn like the vent.. This way you can do vents with different Shapes..
And a double tapered vent can have some very interesting benefits when correctly applied.
I worked on this type of venting quite a bit. And never really found any significant benefit of using a damping material. No benefit in the low end. But in the damping materials range, it could make a difference in midband coverage.
I worked on this type of venting quite a bit. And never really found any significant benefit of using a damping material. No benefit in the low end. But in the damping materials range, it could make a difference in midband coverage.
Now I have a request.
Up till now I have always plotted a horn contour by good old hand drawing.
Is there any method to produce a drawing to scale using the data that Hornresp provides?
That would make my life so much easier. I t can take quite a while to plot a large horn flare.
Up till now I have always plotted a horn contour by good old hand drawing.
Is there any method to produce a drawing to scale using the data that Hornresp provides?
That would make my life so much easier. I t can take quite a while to plot a large horn flare.
So Excel is the answer.
I have tried this. And never end up with a graph that looks like a horn profile.
Please enlighten an Excel moron.
Second question is say that a correct horn profile can be generated as a graph. I know this is possible as I have seen them displayed by Master McBean.
How to take said graph and print it full scale to create a profile I can make a horn with?
I have a few drafting programs, all open source.
Sad to say where my limitations are, but don't ask, don't get!
I have tried this. And never end up with a graph that looks like a horn profile.
Please enlighten an Excel moron.
Second question is say that a correct horn profile can be generated as a graph. I know this is possible as I have seen them displayed by Master McBean.
How to take said graph and print it full scale to create a profile I can make a horn with?
I have a few drafting programs, all open source.
Sad to say where my limitations are, but don't ask, don't get!
I have measure the hornresp advised filling in the subwoofer box and get this outcome.
I think it looks very good, it have afcourse some room modes, I did post this also on bjorno place but have not answer yet.
Strange is that I have to put the isobaric subwoofer out of phase to get it right, when in fase I get a big fase error see last photo, I did see that the 24dB low pass do this, maybe the coils? who I made myselfs.
David, thanks for your answer about the fillings, it will be very nice if i can simulate with crossovers and the filling to get a complete picture.
regards
kees
I think it looks very good, it have afcourse some room modes, I did post this also on bjorno place but have not answer yet.
Strange is that I have to put the isobaric subwoofer out of phase to get it right, when in fase I get a big fase error see last photo, I did see that the 24dB low pass do this, maybe the coils? who I made myselfs.
David, thanks for your answer about the fillings, it will be very nice if i can simulate with crossovers and the filling to get a complete picture.
regards
kees
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Hi Andrew,
If I had known before I started how long the Hornresp journey would be, I doubt that I would have taken the first step 🙂.
Kind regards,
David
Hi Brian,
The design can also be modelled as a conventional 3-segment horn-loaded vented-box enclosure (albeit with a very large rear port tube cross-sectional area Ap). The combined response results should be identical to those generated by your compound horn model.
Kind regards,
David
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Is that the parabolic expansion I can see in the not quite straight flanks of the flares?
Post4173 also shows the "curves"
How could I have mistaken par for parallel?
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I am a bit puzzled about the system efficency plot. I did a simple vented Enclosure with a 15" PA Driver. When doing "multiple enclosures" with 2p2s, I get this:
From my understanding, efficency never can go beind 100%, or am I mising something?
From my understanding, efficency never can go beind 100%, or am I mising something?
Bjorno's sims in #4176 are almost the complete inverse of the Voice of the theatre, which uses a short front load horn, a huge back chamber and a port depth of 3/4" inch (the plywood thickness).