Which is also interesting if we take the low distortion addiction and anxiety into mind.
I have seen quite some compression drivers that outperform very expensive tweeters with ease when it comes down to distortion.
Like around 94dB or so, just only 2nd order distortion at very low levels, while other higher order distortion is basically totally gone even.
Barely or not at all.
The addition material needed for a waveguide vs a tweeter isn't that substantial.
Especially in higher quantities we are talking cents.
It's a bit different for aluminium. Which is just eye candy to begin with.
Quite some manufactures have a special front panel anyway.
So you might as well just change the mold for that with a new design with a waveguide.
With a waveguide it's actually much easier to get a flat frequency response AS WELL as a good directivity.
Good directivity (constant you mean I assume) : ok ! But flat ?! >How is that simple for you or others ? (VS simple tweeter w/o WG; we already have ripples due to the front baffle whatever WG or not !
Any tips, please ?
I was talking about the combination of both.
A good flat response on-axis depends mostly on diffraction.
So get that as good as possible and it will be beneficial on both cases.
Getting a good directivity with just a plain tweeter, is nearly impossible.
Especially if you want a higher angle of directivity.
But how do you deal (passivenetwork) with the V shape null the WG is introducing ? How looks like a passive high pass of a wave guided tweeter ?
V shape null?
In general:
That depends on your design, it's not hard to filter a waveguide.
In fact, because the tweeter is a bit deeper, it often matches better with the woofer.
There are so many examples of this out there.
SB26 ADC in 5" WG
Here an illustration of a 1" tweeter in a WG (courtesy of SOMASONITUS, augerpro's WG)
How equalizing that deep with passive please, anyone?
For my low skill at passive EQ job and such a deep null, seems to me I should ask at minima to Denzel Washingthon !
Here an illustration of a 1" tweeter in a WG (courtesy of SOMASONITUS, augerpro's WG)
How equalizing that deep with passive please, anyone?
For my low skill at passive EQ job and such a deep null, seems to me I should ask at minima to Denzel Washingthon !
Are you referring to the 0 degree or 60 degree response? There is more than one mechanism at work and only one is specific to waveguides.
I get this for the 6" waveguide (from Erin's Klippel) with C1=2.1, L1=.42, C2=8.4. I have not matched those to standardized values, this was just 5 minutes in crossover CAD.
Thanks augerpro... I am bad at those passive filter skill.
I'd like to use the 5" WG with the sb26 cdc from 1500 or 1700 hz thanks to the WG help behavior in the low to have good enough thd.
But the dip in the measurement with the sb26 adc + WG always intimadates me.
I'd like to use the 5" WG with the sb26 cdc from 1500 or 1700 hz thanks to the WG help behavior in the low to have good enough thd.
But the dip in the measurement with the sb26 adc + WG always intimadates me.
Exactly. with - 5 tdB at circa 15 k hz between on axis to 20° off axis. https://static.wixstatic.com/media/b0fc88_963bb7ae384a4db0a5dcaa98467184c4~mv2.png/v1/fill/w_750,h_368,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/5xpoint75 J SB26ADC noPS_PNG.png
The best way to deal with this (IMO) is a simple electrical high-pass that acts initially as an eq. circuit that "flattens-out" the response at higher freq.s (..really it's padding-down the lower-end response).
From there you look to see what the high-pass result is and where you would have your actual low-pass for the midrange or midbass driver.
This means you can just use one smaller cap (series) along with any electrical compensation for tweeter (parallel filter) in a parallel network.
Ex. low point of the depression is around 13.5k for the 5" waveguide link with SB ADC so look to an octave below that for your cap or around 6.5-7 kHz respective of the driver's Impedance at that freq.. This would be in inverted phase relative to the mid-bass driver.
HOWEVER you need to be very careful with matching the mid-bass driver's dispersion relative to what the waveguide is doing at that actual crossover freq. (above and below it) and the expected depth of the driver and its acoustic center around the crossover region relative to the physical off-set of the waveguide/tweeter.
Goran goes through this with several of his designs that use the common DXT from Seas (which is slightly smaller and inferior to Brandon's waveguide profiles), and this one has more detail:
https://www.diyaudio.com/community/...cd-gb-dxt-prestigious-two-monitor-dxt.214366/
As I've stated before - I don't think this is something a Novice would just start doing, particularly considering the fact that you are effectively creating your high-pass filter BEFORE even selecting your midbass driver (and in large part choosing your midbass driver based on it's dispersion character where you have already determined your crossover freq. and slope will be).
From there you look to see what the high-pass result is and where you would have your actual low-pass for the midrange or midbass driver.
This means you can just use one smaller cap (series) along with any electrical compensation for tweeter (parallel filter) in a parallel network.
Ex. low point of the depression is around 13.5k for the 5" waveguide link with SB ADC so look to an octave below that for your cap or around 6.5-7 kHz respective of the driver's Impedance at that freq.. This would be in inverted phase relative to the mid-bass driver.
HOWEVER you need to be very careful with matching the mid-bass driver's dispersion relative to what the waveguide is doing at that actual crossover freq. (above and below it) and the expected depth of the driver and its acoustic center around the crossover region relative to the physical off-set of the waveguide/tweeter.
Goran goes through this with several of his designs that use the common DXT from Seas (which is slightly smaller and inferior to Brandon's waveguide profiles), and this one has more detail:
https://www.diyaudio.com/community/...cd-gb-dxt-prestigious-two-monitor-dxt.214366/
As I've stated before - I don't think this is something a Novice would just start doing, particularly considering the fact that you are effectively creating your high-pass filter BEFORE even selecting your midbass driver (and in large part choosing your midbass driver based on it's dispersion character where you have already determined your crossover freq. and slope will be).
5-25k is where 5" WG does not have much effect, it does not boost SPL. It makes boost ~3kHz area.
Usually no special filter, topology, or RLCs etc are needed. Boost compensation is done by the first capacitor in the filter, very simple. So in this regard it is not difficult for the novices.
Full WG + system design is more complex, but let's not look at it as something that anybody wanting to try WG should be scared off.
First step is to choose well designed WG+tweeter combination. Robust tweeter will give a freedom in choosing FC, and usually 1500-2500Hz is the right area. The second step is to choose the right midwoofer which should have no problems with Fc up to 2500Hz.
Usually no special filter, topology, or RLCs etc are needed. Boost compensation is done by the first capacitor in the filter, very simple. So in this regard it is not difficult for the novices.
Full WG + system design is more complex, but let's not look at it as something that anybody wanting to try WG should be scared off.
First step is to choose well designed WG+tweeter combination. Robust tweeter will give a freedom in choosing FC, and usually 1500-2500Hz is the right area. The second step is to choose the right midwoofer which should have no problems with Fc up to 2500Hz.
Just for fun, what sensitivity we would expect with such a filter applied to the SB26ADC + WG? There is -12 dB from the filter at 10 kHz and the SB26ADC + WG start with 86 dB sensitivity in this area without filter. So we end with an approx 74 dB sensitive tweeter section. 🤓