Less coloured sound but serious Localization & Integration issues?
Well the die-hard cardiotics are still dancing around their golden calf
You can't have it all .. no free lunch!
If you want to get a very narrow band cardioid response at quite low frequencies, yes you can. If you want midrange cardioid or a wider range of frequencies affected, no the distance between sources is too much.
On the topic of cardioid……I’ve used it extensively in live installations and touring……keeps the low end from building on the performance stage where it pollutes the microphones, stage volume and induces low end feedback. At home, the only need for such low end directivity has been in the nearfield for monitoring, creating that same headphone experience only outside of my head…….it allows me to work quicker and make better decisions first time around.
Other than that, for home recreational use…..I don’t see a place where it’s practical.….. nor desirable from a subjective standpoint. What 3 identical subs and one additional out of phase can do with DSP is astonishing.…..I suggest it here as often as I can for those who are non believers. Fans of orchestral music take note….THIS is how you bring the concert hall into your space.
Other than that, for home recreational use…..I don’t see a place where it’s practical.….. nor desirable from a subjective standpoint. What 3 identical subs and one additional out of phase can do with DSP is astonishing.…..I suggest it here as often as I can for those who are non believers. Fans of orchestral music take note….THIS is how you bring the concert hall into your space.
Cardioid in the low bass, say below 100Hz where a separate sub operates is not really the point for home use (indeed it is very inefficient), rather maintaining directionality from the baffle step frequency down to about 100Hz is very beneficial, keeping RT60 lower in that difficult to treat range. I think of it as having a virtual wide baffle speaker without the practical issues of a 1m wide speaker.
P.S. I'm not convinced the benefit of cardioid is the ability to place a speaker close to the front wall. The more of your room that is placed behind a cardioid speaker, the less your room is being driven for the same SPL at the listening position.
P.S. I'm not convinced the benefit of cardioid is the ability to place a speaker close to the front wall. The more of your room that is placed behind a cardioid speaker, the less your room is being driven for the same SPL at the listening position.
Do you mind expanding on the 4 subs arrangment?
One use for it could be to prevent feedback from a turntable, set behind the speakers ?
I'm not familiar with this, have any links?
I'm familiar with the Geddes multisub approach, but haven't heard of using four and inverting one.
https://www.audiokinesis.com/the-swarm-subwoofer-system-1.html
Audiokinesis introduced a retail system/solution around a decade ago building on the work of Geddes and Harmon. I don‘t know how robust the DSP was back then or if they’re since improved it. The single out of phase sub is optional and works in some rooms better than others……..it would be dependent on placement limitations of room volume of course…..each situation will be unique. My personal experience is that I’ve always experienced a benefit from the single out of phase combined with 3 in phase.
Now if one were to combine say a 2x4 DSP with four independent subs each with their own plate amp equipped with variable phase control…..well…..the potential would be limitless……lots of wiring as well but in the struggle and strife for perfection?
Audiokinesis introduced a retail system/solution around a decade ago building on the work of Geddes and Harmon. I don‘t know how robust the DSP was back then or if they’re since improved it. The single out of phase sub is optional and works in some rooms better than others……..it would be dependent on placement limitations of room volume of course…..each situation will be unique. My personal experience is that I’ve always experienced a benefit from the single out of phase combined with 3 in phase.
Now if one were to combine say a 2x4 DSP with four independent subs each with their own plate amp equipped with variable phase control…..well…..the potential would be limitless……lots of wiring as well but in the struggle and strife for perfection?
Multisubs and cardioid don't conflict. Multisubs for 100Hz down combined with cardioid for 100 hz up works. If you've got a dedicated room with multisubs, you are probably free of space and placement constraints that would otherwise lead you towards cardioid to complete the solution. If on the other hand, you are footprint and placement constrained, cardioid from 100 hz up might be just what you need.
there is a free mult-sub optimizer will help you get the most of your subs, i.e. generate optimal filters for that 2x4 DSP:
multisub optimizer link
there is a free mult-sub optimizer will help you get the most of your subs, i.e. generate optimal filters for that 2x4 DSP:
multisub optimizer link
The cardioid implementation in the Sigberg Audio Manta does not have any meaningful loss of capacity / increase in THD.
Hi all,
i am no good with VituixCAD but very quick with Visaton's BoxSim
simulating real quick something similar like the Blade construction like this
i can see that there might be issue with the directivity changes between 200 and 500 Hz and with the frequency response directions that you will not get with front mounted woofers
So far - so good, Stefano
P.S.: for correctness also the on axis estimated frequency response
active crossover
LR4 330 / 270 Hz woofer to midrange and PEQ 30 Hz / Q=1 / A=6db for CB enclosure bass EQ for free field simulation
LR4 3300 / 4300 Hz midrange to dome with waveguide
i am no good with VituixCAD but very quick with Visaton's BoxSim
simulating real quick something similar like the Blade construction like this
i can see that there might be issue with the directivity changes between 200 and 500 Hz and with the frequency response directions that you will not get with front mounted woofers
So far - so good, Stefano
P.S.: for correctness also the on axis estimated frequency response
active crossover
LR4 330 / 270 Hz woofer to midrange and PEQ 30 Hz / Q=1 / A=6db for CB enclosure bass EQ for free field simulation
LR4 3300 / 4300 Hz midrange to dome with waveguide
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