question about 6th bandpass front tuning

[manninen]

i got all the plywoods, tomorrow start building

YouTube
mika vainios sonar festival set. bit hard to subs his instruments, this could be fun to hear thru full size horn bass.

 

[manninen]

cat has allready been inside, i think i have to keep it mouth down.

many screws can be taken of cause of clue

 

[globalplayer]

This is a 4th order now?

 

[manninen]

took impedance curve and really close to post 19 sim

 

[globalplayer]

Ah OK.
My bad.
How is the sound?

 

[manninen]

gonna smoke it tomorrow, bit sad that cut on impedance curve at 128hz, on sim it is on 143hz

cut on fr i think gonna be bad.

there is none damping inside

 

[manninen]

in room 40cm from mouth.

phase does not look so good

 

[manninen]

How is the sound?

well, it loses naked ob hands down.

room interferes a lot more, however tracks death metal quite well.
i allready found good settings for this.
effiency much better than sealed boxes which i had 26db amp gain, this can run 22db, ob has 32db.

my ears might have evolved for natural unpressurising ob bass.

box speakers gives some bass pollution inside this apartment, some hotspots builds up, and i dont like them.

if i find good spot for the box i might not burn this in midsummer bonfire

 

[manninen]

dauumn. this can be set mouth up, front, left or right, mouth down front, left or right

mouth down to right dauuumn! maybe best bass heard in this room

comparison mouth front

and groundplane´ish measurement

15ms window lenght

 

[Josh Ricci]

Manninen,

To help your graphs be a bit easier to read and show the data more clearly in the future, restrict the graph range to the frequencies of interest. This is a subwoofer so there is no need to have the graph extend to 20kHz. Try setting the frequency range to 10-200Hz.

Also I'd recommend using no smoothing for measurements in the bass range <200Hz.

You need to use a very long window for measurements in the subwoofer range. Low frequencies are slow. They take a lot of time.

 

[manninen]

sorry about that Josh, and everybody else.

for best results i should keep posting Smaart curves cause i got bunch of AC fans downstairs which humms 50hz which is close to this room mode, it multiplys on listening spot and messes up my curves

 

[manninen]

here´s 500ms graphs

this spot is kind of natural, zero gain to under 40hz, it sounds great with music.

I track phase with many windows lenghts

 

[manninen]

How is the sound?

ok now i have two of these.

eq´d flat nearfield, -3db 103hz
listening spot is flat without eq but cant keep it without notch, sounds hot without.

i have to keep these -2db overal so these seems to be +6db over 120l sealed

sound, its really kicking, could be bit flavour on upper 70-120hz, works on some records. not neutral like funktion one resolution twos aint either.

better settings tomorrow with smaart

 

[BP1Fanatic]

This is a 4th order now?

Good question! Look like a BP4 to me.

 

[manninen]

Been rounding up 6th order bandpass, about my design i have question

front port is larger than front chamber, is this going to act like front loaded vented horn or 6th order bandpass, hornresp shows some difference between these two, not much but visible to my eyes.

6th order bandpass is bit mindblow, it´s just group delay controlled vented box

 

[BP1Fanatic]

Wow, you went from a series tuned BP6 to a parallel tuned BP6 with opposite direction exits.

 

[manninen]

I dont know which i went but went as planned on first post.
Its more simmed as offset front horn than 6th order bandpass. Thin red line between those two

 

[BP1Fanatic]

Offset vented front horn = positive flare front port and straight flare rear port. Both ports fire in the same direction.

 

[manninen]

Yeah, about the same but my rear port is inside the front flare. Series tuned offset front horn? Now simulate that on hornresp

 

[manninen]

here is phase response taken from smaart, this setup has 12.1ms of delay above sub.
xo points 120, 380 and 5000