Calling upon all residential loudspeaker engineers.
I am considering using the C25 tweeter and C90 midrange, but I am facing a dilemma. The diaphragm's are more or less on the same vertical plane when placed on a flat baffle. Nothing wrong with that per say, but it creates an interesting problem I would like to highlight and potentially get some input on. The issues is dispersion. I know first hand how a well implemented waveguide sounds and it is pure magic for the XO point and transition from midrange to tweeter. Since the Accutons are on the same acoustical plane, to time align the tweeter is never done. I've not seen any Accuton speakers with a waveguide and so, one run into the "issue" of loosing out on that extra level a waveguide offers.
The fix could be something like moving the tweeter and midrange to the woofer's acoustical plane, and give the tweeter a waveguide size corresponding to midrange size (5") and give the midrange waveguide size corresponding to the midwoofer size (6-7").
Anyone out there who have a similar experience or wana chime in ????
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(While writing this thread, I found one commercial company who did use waveguides with Accuton, namely Audiograde, but their website is for sale, so maybe the business is no longer operating.)
I am considering using the C25 tweeter and C90 midrange, but I am facing a dilemma. The diaphragm's are more or less on the same vertical plane when placed on a flat baffle. Nothing wrong with that per say, but it creates an interesting problem I would like to highlight and potentially get some input on. The issues is dispersion. I know first hand how a well implemented waveguide sounds and it is pure magic for the XO point and transition from midrange to tweeter. Since the Accutons are on the same acoustical plane, to time align the tweeter is never done. I've not seen any Accuton speakers with a waveguide and so, one run into the "issue" of loosing out on that extra level a waveguide offers.
The fix could be something like moving the tweeter and midrange to the woofer's acoustical plane, and give the tweeter a waveguide size corresponding to midrange size (5") and give the midrange waveguide size corresponding to the midwoofer size (6-7").
Anyone out there who have a similar experience or wana chime in ????
****************************************
(While writing this thread, I found one commercial company who did use waveguides with Accuton, namely Audiograde, but their website is for sale, so maybe the business is no longer operating.)
Yes it is a good idea. Making the tweeter waveguide that diameter is just one of the properties to adjust.
I think waveguiding the midrange would become a complication for the upper cross. It may be better to try to run the tweeter as low as you can to cross to a woofer that is as large as you need.
I think waveguiding the midrange would become a complication for the upper cross. It may be better to try to run the tweeter as low as you can to cross to a woofer that is as large as you need.
Hi Allen 🙂
I do see your point and at the same time, crossing with a 6.5-7" woofer at something like 2kHz is often the less ideal since you want to stay at least 1 octave bellow the first cone breakup issues or a decrease in off-axis dispersion, and for 6-7" woofer, that often mean bellow 1.5kHz which already is lower than many tweeters like to be crossed at, since they are best crossed at least 1 octave above their Fs and for the C25 that happens at 810Hz which mean a minimum XO-point of at least 1620Hz with a steep filter (24dB/oct). And that is why we use at least 3 drivers in a loudspeaker 🙂
See, I knew that taking the Accuton drives to the next level was going to be difficult. But maybe, if I keep the C90 5" midrange and pair it with a plasma tweeter for even lower distortions than the ceramic tweeter can achieve, I bypass the waveguide issue between the C25 and C90... hmm, something to think about there.
Waveguides are paramount between tweeters and midranges, perhaps even between the midrange and woofer as well. It's difficult to go back to no waveguide once you have experienced the of so sweet benefits.
Hey, thanks for chiming in 🙂
I do see your point and at the same time, crossing with a 6.5-7" woofer at something like 2kHz is often the less ideal since you want to stay at least 1 octave bellow the first cone breakup issues or a decrease in off-axis dispersion, and for 6-7" woofer, that often mean bellow 1.5kHz which already is lower than many tweeters like to be crossed at, since they are best crossed at least 1 octave above their Fs and for the C25 that happens at 810Hz which mean a minimum XO-point of at least 1620Hz with a steep filter (24dB/oct). And that is why we use at least 3 drivers in a loudspeaker 🙂
See, I knew that taking the Accuton drives to the next level was going to be difficult. But maybe, if I keep the C90 5" midrange and pair it with a plasma tweeter for even lower distortions than the ceramic tweeter can achieve, I bypass the waveguide issue between the C25 and C90... hmm, something to think about there.
Waveguides are paramount between tweeters and midranges, perhaps even between the midrange and woofer as well. It's difficult to go back to no waveguide once you have experienced the of so sweet benefits.
Hey, thanks for chiming in 🙂
My pleasure 😉
Sometimes you need to go right up to the first breakup mode, or even include it, to get the right directivity. Maybe some dome tweeter waveguides do wider than 45 degrees.. but a polar plot on each driver will give you the answer on where to cross.
Sometimes you need to go right up to the first breakup mode, or even include it, to get the right directivity. Maybe some dome tweeter waveguides do wider than 45 degrees.. but a polar plot on each driver will give you the answer on where to cross.