my last design: 3-way/3-liters

[crazyhub]

A dwarf with a big voice (f-3 = 69Hz)
TangBand W5-876SD
Peerless 830970 (FR2")
Dayton ND20FA6


Serious sounding speaker!
Shin, FR2 uses aluminium (stiff) cone, what a shame

[ShinOBIWAN]

Interesting. So you run the Peerless fullrange and the Dayton plays along side for the last couple of octaves. I presume you did this for off axis reasons because from on axis it doesn't look like the Dayton is really needed.

Isn't there comb filtering issues between the two and what about horizontal alignment of the Peerless and Dayton. I presume you have to sit on axis otherwise nulls appear due to changing distance between the two as you move to the left or right? IMO Horizontal alignment is OK for bass but higher frequencies are better served with vertical.

[crazyhub]

Originally posted by ShinOBIWAN
Interesting. So you run the Peerless fullrange and the Dayton plays along side for the last couple of octaves. I presume you did this for off axis reasons because from on axis it doesn't look like the Dayton is really needed.

Isn't there comb filtering issues between the two and what about horizontal alignment of the Peerless and Dayton. I presume you have to sit on axis otherwise nulls appear due to changing distance between the two as you move to the left or right? IMO Horizontal alignment is OK for bass but higher frequencies are better served with vertical.

Hi Shin
Initialy I designed these tinies for low listening levels in small rooms in mind; this forces the need of increasing trebles, thus the super-tweeter way; also the 3-liters/3-way concept pleased me; I like relative unconventional ways.
As you can see on the SW sim the tweeter does help the FR2 to fill the small 4-8Khz dip and does enhance the last upper frequencies, exactly what it was intended for; I tested the FR2 alone but without a notch it doesn't work enough in the upper-treble range.
Comb filtering issues because of the horizontal placement of the Peerless and Dayton?...mmh...center to center drivers is only 5cm ...what I can say is that if I stand up or if I moove L or R at average listening distance, I find the sound well balanced.

[ShinOBIWAN]

Well 1/2 wavelength of 5cm is ~3500hz so that's what I was getting at with the comb filtering. And the horizontal mid-tweeter alignment can cause nulls in the horizontal off axis response much the same way as you would with a vertical driver alignment ala traditional design. BTW I was asking if you noticed these things as problems and not stating them as such. Curiosity if you like.

[MJL21193]

Here's a little suggestion regarding pictures: Link to the image so we don't have to klick on it and get the stream of ads that are attached to the site.
Or upload to the forum, one pic at a time.

[crazyhub]

Originally posted by ShinOBIWAN
Well 1/2 wavelength of 5cm is ~3500hz so that's what I was getting at with the comb filtering. And the horizontal mid-tweeter alignment can cause nulls in the horizontal off axis response much the same way as you would with a vertical driver alignment ala traditional design. BTW I was asking if you noticed these things as problems and not stating them as such. Curiosity if you like.

When I spoke from the 5cm C to C distance I meant mostly "relative to my listening distance" i.e. 3.5 meters from speakers; I guess this distance certainly reduces the effect of possible comb filtering problems.
Also I have to admit that I'm much more concerned by the amount of off-axis energy relative to my room acoustic than relative to my listening place; for example the poor vertical off-axis energy of my Modulus ruban tweeters don't disturb me because I don't stand up when listening to music.

[crazyhub]

Originally posted by MJL21193
Here's a little suggestion regarding pictures: Link to the image so we don't have to klick on it and get the stream of ads that are attached to the site.
Or upload to the forum, one pic at a time.

this way for example?

[MJL21193]

Excellent!


Response looks good BTW.

[crazyhub]

Originally posted by MJL21193


Excellent!


Response looks good BTW.

Thanks!
Sounds good too, particularly in the bass range which extands enough and is very tight; I already imagine 8xW5 per side in a 48 liters BR box (f-3=50Hz)...a real killer!

[inertial]

Hi crazyhub ,nice to see you here !

Very beautiful concept, I like minimonitors
What about a possible nearfield listen? I have made experiments with
2 meters or less and it sound fantastic with such minimonitors

Cheers,
Paolo