Question regarding the B&G RD75's

[pk]

I have heard truly great reviews abou the B&G RD75 planers and have seriously considered going for these. However, now and then I would like to be able to play loud and I am somewhat sceptical towards their output capabilities. Hence this crazy (and expensive) idea:

Would it be possible to use 2, 3, or 4 pcs per side mounted just next to each other without compromising the sound?

I would imagine that lobing might be an issue, but then I saw that Wisdom Audio seem to use 3 units next to each other in their Wisdom Infinity series


High performance in-wall and on-wall architectural products and subwoofers with Audyssey Room Correction - Wisdom Audio

What do you guys think?

Thanks a lot!

Best regards
Peter

 

[WrineX]

its not verry usefull to put them besides eachother, it will screw up ur dispersion i believe. and you get a narow sweet spot. tha gain is also limited ,, addig few hundred dollars to gain 3 dB? or put them paralel to gain 6 , but you amp wont like that i think.

i really woudl suggest not to sped so much money on them if you just want it to go loud. i recon they play really loud as they are.

 

[63781]

How loud do you want to play, and at what distance?

Using several drivers is not very effective, and will screw up the dispersion horizontally. Increasing the XO point is a far better solution if max SPL becomes an issue I think.

 

[jcx]

the real dimension you want to consider is the low frequency requirement - displacement increases at least as the inverse square of frequency, higher order for dipole

so just cross over a octave higher to the subs and the BG will be plenty loud

 

[pk]

Dear WrineX, StigErik, and jcx,

Thanks a lot for your replies!

At the moment I sit fairly close to the speakers (3-4 meters), but I may be moving in the not too distant future, and I really would like to preserve the posibility to play really loud at times (I used to have a fully horn loaded 3-way system with straight 29 Hz bass horns...).

So, I quess the RD75's are not for me.....

Thanks a lot for responding, though🙂

Best regards
Peter

How loud do you want to play, and at what distance?

Using several drivers is not very effective, and will screw up the dispersion horizontally. Increasing the XO point is a far better solution if max SPL becomes an issue I think.

 

[bikmakr]

Multiple RD75 drivers

I am currently playing with the same idea (See pic) for the same reason (more SPL's) After a lot of testing, 3 RD75's at 1 degree delta creates a wonderful sound stage without lobing. Any more and impedance gets interesting. I am struggling with mid-base matching with 2 Velodyne Sig 1812. My theory was having many RD75's, I could lower my XO to 125ish without stressing the ribbons. I have 6" wide airfoil baffles that I am going to tune to hopefully get more mid-base from reducing back-wave cancellation. Any comments are welcome, as I am a novice at building speakers. I am after better performance than my Genesis 201's had and the airiness of my old Infinity BETAS.