Conical Horn with Markaudio Alpair10 FR

[Henkjan]

I mentioned it already in some other threads, I have put the Markaudio Alpair10FR in a conical horn. and it is that good imho that it deserves its very own thread

this combination is bull's-eye in any way, for it combines the lively sound of a horn, the 'pure' sound of a full range without any corrections, and the tonal accuracy and true full range, flat response usually only found in good multyway speakers.


some quick measurements... under 400Hz is nearfield (2"), under 100Hz I deleted the graph for I was too lazy to include the horn output.
some slight non-flatness above 4kHz which might be diffraction (again, lazyness causes the lack of off-axis measurents) but in any case do not colour the sound in any way

and a sketch:

and guess why I have not made a proper drawing

[EUVL]

No BSC, no notch ?
Looks great.


Patrick

[Scottmoose]

Given that the majority of the horn output will be below 100Hz it's a shame it hasn't been shown, as the graph is effectively giving very little, if any, information about how the cabinet is behaving.

[Henkjan]

Originally posted by EUVL
No BSC, no notch ?

no, just the driver and a horn

Originally posted by Scottmoose
Given that the majority of the horn output will be below 100Hz it's a shame it hasn't been shown, as the graph is effectively giving very little, if any, information about how the cabinet is behaving.

yes, I know. when I fix my own measuring gear I will do some close range of driver and port, for normal measurements will only represent my listening room. I could dig out the sims if you are interested?

based on my ears, I would guess that f3 is somewhat below 50Hz

[GM]

For the moment, stick the mic ~ 1mm ~centered inside the port and horn mouth to get a near-field measurement to take enough of the room's effect out of their respective response.

GM

[_henry_]

Henkjan,

Did u try Jim's style ML-TL? if no need for bsc for this conic horn it will be superb.

[Henkjan]

Originally posted by GM
For the moment, stick the mic ~ 1mm ~centered inside the port and horn mouth to get a near-field measurement to take enough of the room's effect out of their respective response.

I know the theory, the prob is that I need to fix my own measuring gear first...

Originally posted by _henry_
if no need for bsc for this conic horn it will be superb.

there is no need for a bsc with this horn

Originally posted by _henry_
Did u try Jim's style ML-TL?

no, already suffering from the "too many projects, so little time" syndrom.

[_henry_]

henkjan, any updates on your conical horn?

im sure u're enjoying too much

[Henkjan]

sorry, no updates yet... I did buy all the stuff I need to get my measuring gear working again (mic, USB-preamp, usb hub) so when i find the time and courage to install everything, I will post it here...

[madawasca mike]

The shaded area at the top left of the right hand view, I take to be the driver mounted. I just wondered since it's shown as a box if that is what is meant or does it simply represent the driver installed onto the baffle.

And lower down on the right above the opening, I take the squiggly
red lines to be suspended dampening held in with a mesh?

I have order the Alpair 10's and hope to make this my first build.