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Old 14th September 2021, 09:33 AM   #591
vdB is offline vdB  Netherlands
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Quote:
Originally Posted by Ivo View Post
I want to try that JBL diffusion slot that was shared.in another thread. It has a special shape to reduce some of the negatieve effects and should reduce beaming in at least part of the bandwidth. A 60x40 pattern is claimed, but I suspect that will not be at 15kHz. Worth a try though.
Saw that one too. I also read good things about a foam ring in front of the driver to improve dispersion. Rear mounted my Fanes to make room for this in advance.
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Old 14th September 2021, 09:34 AM   #592
KaffiMann is offline KaffiMann  Norway
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Location: Grua, not far from Oslo.
New 15" full range- FANE
Quote:
Originally Posted by Ivo View Post
I want to try that JBL diffusion slot that was shared.in another thread. It has a special shape to reduce some of the negatieve effects and should reduce beaming in at least part of the bandwidth. A 60x40 pattern is claimed, but I suspect that will not be at 15kHz. Worth a try though.
Very interested in any findings.

IMO the most problematic area is with the various resonances 1-8khz.
Two relaxed shelving filters (One low-ish to dampen and another up over 10khz to regain) and a few dip notches take care of most of it.
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Old 14th September 2021, 07:37 PM   #593
fabricadetabaco is offline fabricadetabaco
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Originally Posted by vdB View Post
Nice!

What makes you want to open them up? Have you considered aperiodic vents?
I think with this small sealed volume (150l each for two drivers, 75 each) I feel like I’m holding back low end and introduce uneccessary heat to the coil with bass eq, especially after burning one it seems to be the case. Wondering if I can somehow increase the low end sensitivity so I don’t need to boost with eq but rather use a subsonic filter to protect over excursion. Sonically I need to buy an eq to tame the mids but was hoping to avoid eq boosting in the low end and rather achieve somewhat deeper bass and less booming midbass by opening up. Have no idea what size diameter or lengt would fit here though. 45Hz-50Hz tuning would be great. I’ve connected the drivers in series to see if the amp behaves a little better but not sure if 16 ohm is good for the amp? The sensitivity is definitely not a problem these play load with minimum gain even when serial connected. The amp doesn’t get as hot now so that must be a good sign. No melting coil smell either so far so good but sonically not perfect.

Last edited by fabricadetabaco; 14th September 2021 at 07:41 PM.
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Old 15th September 2021, 06:13 AM   #594
vdB is offline vdB  Netherlands
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I see.

Have you tried to model your question

inputs: fixed box dimensions, two drivers with given parameters, 45-50Hz tuning target
output: BR tube diameter/length

with software?

Also, your use case as I understand it, i.e. playing outside at driver-frying levels, does not appear to call for skimping on box size. Does it?

I vaguely remember having seen a simmed enclosure design (not Ivo's) that might be an interesting starting point, should you be open to letting go of the first two constraints. Might actually be somewhere in this thread. Will try and find it.

Last edited by vdB; 15th September 2021 at 06:19 AM. Reason: Removed some parentheses, fixed grammar
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Old 15th September 2021, 06:40 AM   #595
vdB is offline vdB  Netherlands
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A quick update.

Last night I finished the other box, now with the 6mm felt carpet underlay.

This seems to work a bit better. However I think I could still get a lot closer to Hartley's outcome if I had access to the stuff that he used himself. Which would be about 10mm felt on a burlap core. Maybe there are modern materials that would work even better. Carpet tiles? How does one in general suck up backwaves in 2021?

First listening impression, with essentially two different speakers, is that some of the magic is back again. So that's good. Some obvious flaws still remain, for instance quite a pronounced resonance with male voices. Expecting these (and more) to clearly appear in my first measurements.
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Old 15th September 2021, 09:13 AM   #596
fabricadetabaco is offline fabricadetabaco
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Quote:
Originally Posted by vdB View Post
I see.

Have you tried to model your question

inputs: fixed box dimensions, two drivers with given parameters, 45-50Hz tuning target
output: BR tube diameter/length

with software?

Also, your use case as I understand it, i.e. playing outside at driver-frying levels, does not appear to call for skimping on box size. Does it?

I vaguely remember having seen a simmed enclosure design (not Ivo's) that might be an interesting starting point, should you be open to letting go of the first two constraints. Might actually be somewhere in this thread. Will try and find it.
I have not done any simulation for this design no, we designed it as a sealed box to limit xmax, achieve tight mid-bass and smooth roll-off to fit the primary user musical taste within classic rock, blues etc from the 70s and 80s where the need for the lowest few octaves are of less importance.

At first we made only one cabinet and wanted to keep the footprint at minimum but realized the next year we wanted to cover a larger outdoor area with sound and build another.

Id wish I made the baffle 10cm taller and the depth 10cm higher increasing volume from 150 to 240l, I'm sure that would allow us to not use any eq boost in the low end and only focus on mid-taming but there is no science which is more exact than hindsight we are not starting over but we have to option put some ports below.

Ill definitely install some software and play around as I'm building some other speakers now that I decided to port for the same reasons as above.

The frying of the driver might be an accident from some of the kids playing Drake, these drivers nor the current amp are built for that kind of music at the level we play 80s stuff.

People think that just because they are large they tolerate anything, they do not. If you see it moving from distance you are pushing its limits and I can hear it distorts easily. I guess the kids didn't know that but now they do. Good thing the drivers are cheap.
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Old Today, 06:47 PM   #597
vdB is offline vdB  Netherlands
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O no, I'm sorry to hear about the accident. Somewhere in this thread a couple of breaking in methods are mentioned from which I had the impression that the drivers are quite indestructable. Apparently not so. Good to know.

I hope you'll be able to find the required port dimensions. Most interested in your findings.
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