Being rounding up if waveguides were passive, that releases some channels for bass management.
Today tried end fire system, kind of. delayed front played fullrange and 1m back played to 100hz. 1ms gaps multiple measurements and listening what it does.
if i hook speakers front and back it might be only 30cm between voicecoils.
yeah i have to think about it all
I've thought about using the same waveguides. The price is right and the performance looks excellent. Could probably use some damping material to get the best out of them.
I have bitum on midhorns back, i might use stp black gold on high guide. High guide is not yet on that simulation. i´ll bet those polars is PIA to measure indoors, can´t go outdoors cause it´s freezing outside. speakers this size what is even correct way to measure?
Suspend it on a crane facing the floor and lift it up at least 5m. Put the mic in the ground with only tip being out. Measure.
Yes there are many levels in diy audio.
It would be cheaper to rent anechoic chamber and pay for some one for exact measure.
Or put that money to room acoustic and do it like allways.
It would be cheaper to rent anechoic chamber and pay for some one for exact measure.
Or put that money to room acoustic and do it like allways.
I once made an indoor test with cardioid bass system. Two boxed woofers back to back and minidsp variable delay. By theory this kind of system has only narrow band for cardioid response, because of physical separation of sources.
Indoor measurements didn't give me much reasonable. So, go outdoors! Bass close to front wall or in-wall is very good but room modes are always there!
Indoor measurements didn't give me much reasonable. So, go outdoors! Bass close to front wall or in-wall is very good but room modes are always there!
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No matter is it outdoor or indoors im gonna measure to simulated listening spot.
Might end up using that rear 12" as infra, my lowest fir xo is 62.5hz
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It all depends on level of precision that you want to achieve. Of course measurements can be done indoors too. It takes a little (or a lot) longer to get things right but it's not impossible.
Outdoor measuring is not expensive, it's just a bit complicated becuse it demands that everything is battery powered. Other than that i keep geting the cleanest and most resolving results outdoors. With anechoic chambers there are always problems with lower end of the spectrum. They are great for distortion measurements and all other types of measurements where the climate is/can be harsh.
Outdoor measuring is not expensive, it's just a bit complicated becuse it demands that everything is battery powered. Other than that i keep geting the cleanest and most resolving results outdoors. With anechoic chambers there are always problems with lower end of the spectrum. They are great for distortion measurements and all other types of measurements where the climate is/can be harsh.
can this be simulated versus straight baffle? On straight baffle there not seems to be lobing problems on 400hz x-over
Been rounding up with EDGE woofers on the box.
jbl 5674 array seems best, so no need to desing it from scratch. jbl did it already
simulated polars from just 4x12" on front. those jbl waveguides should give me DI >9 from 400hz, its quite good match but my audio friend noticed directivity rise up quickly from 100 to 500hz
what we could do is on both side to the box another 12", 6x12" on one box two active channels.
we can bend directivity on needed area, area aint big and not wide but there is things happening.
Thanks ville for helping me with vituixcad
that diamond shape 5674 woofer arroy i cannot do, height goes over 180cm with that one
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More simulations done, that quad 12" would give nice punch but seems that 400hz is too much for that setup directivity wise.
So i lowered my output capacity to 12" on rear and 12" on back.
rear driver gives me this, i hope it kills front wall reflection
driver height looked well after jbl factory, midrange height is just above floor reflection and woofer can be placed under that reflection.
Does anyone know high playing 18" which could do well 400hz
I only know phl audio which genelec use their largest monitor.
this is issue with 4x12" on front.
upper woofers needs to be 190mm back them to match lower woofers, its just about limits to reference axle.
picture of all being on and just 2row uppers with same eq, lower woofers slightlty cancelling output allready
i have two sealed speakers, today i listened them to be endfired.
does not do much against the wall, but what it do it kind of accurate 70hz area but everything around kind of level up.
might be that these type of speakers need more space to work better
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Bass boxes are playing!! F1 on top cause jbl high horns are delayed.
Cardioid setup made 100% vituixcad diffraction tool, i believe quite true under 100hz.
Bass is definitely most different i´ve had in this room.
12" on baffle aint that good as inlow 135hz horn was.
This setup sounds quite good for my inner basshead
rear polarity is reversed as in true cardiod but theres high pass which makes it in phase but gains only +1 to 2db. does not need much room correction.
First sounds from jbl plastics.
Havent used to LR4 xo, seems i have to reverse tweeter polarity to get it right, i dont know if is right or not.
LR4 should be same polarity. Might be acoustic center/delay problem causing that. Then some drivers just have polarity marked wrong way...
