3-way accuton build

[lisette]

hello forum,

i was offered some farely cheap accuton drivers... 4 midbass c-158-8-085 and 2 woofers S220-6-221. i wasnt really planning a hifi build, but i guess its too good of an offer to pass, so ill build 2 speakers for my room...

i will either get 2 of the midbasses and go for a 2-way build (maybe something similar to the mundorf ma30),

or go 3-way... in case i choose the 3-way option: would it make sense to get all 4 midbasses, or just 2...? im not sure if the 2 s220s can keep up with 4 c158s or if a 1-1-1 setup would be more balanced?!

cheers, lisette

 

[Inductor]

Hi lisette,
Yes you would need 2x woofers for each mid. If you make a let's say, a D' Appolito configuration you will be dampening the mids more than 6dBs in resistors.

 

[Inductor]

You can make a center channel with the remaining 2 mids also.

 

[Inductor]

You can have the sattelites MA30 type and have the 2 woofers in an active channel with a plate amp type also instead of a standard passive 3-way.

 

[lisette]

all pretty cool ideas, ty. however i think 2 MA30s is probably the way to go for me, my room is just ~20m^2, a bass extension seems kinda overkill :/ i might just resell the other drivers or just get 2 c-158s...

now i will try to recreate the crossover mundorf designed for the ma30... seems to be a -6db x-over at 3450Hz with 2 notch-filters (1 at 3450 for the tweeter and one at ~3200 for the midbass)

i found this partlist and diagram:
https://i.imgur.com/hz0HAOW.jpg

i don't understand the wiring of the components yet, will try to figure this out now, any help would be appreciated... the only other info i have is : "Elektrotechnisch ist das Layout der MA30 Frequenz-Weiche ohne parallel verschaltete Bauteile rein seriell und für Bi-Wiring bzw. Bi_Amping ausgelegt", which translates into something like "the layout of the x-over comes without parallel parts in a serial layout for bi-wiring/bi-amping"

cheers, lisette

 

[Inductor]

I guess it's a series crossover then. I would go for the/a 3 way with woofer or the two mids with tweeter anyway.

 

[lisette]

very tempting indeed, ill give it another nights sleep...

 

[lisette]

when i design a simple series crossover with 2 notch filters i use 3 capacitors, 3 coils and 2 resistors. probably another resistor to dampen the tweeter... mundorf used an extra coil and 3 extra resistors. any idea how they could be used in this crossover?

 

[Inductor]

Mundorf MA30
It must be something close to this.

 

[Inductor]

Mundorf MA30 - Speaker KIT

Note: The 22uF capacitor (C5) is missing from the/your parts list.

 

[lisette]

awesome, TY!

 

[lisette]

one more question: im pretty sure i can see a 5.6 μF condensator on the board but not in your diagram... are your numbers slightly different maybe?

cheers, lisette


EDIT: ah i'm stupid, forget what i just wrote XD

 

[Inductor]

Inductors
L1=0.33 CFC.14V RDC=0.13 (Ohms) Equiv.Diam 1.6mm
L2=0.68 CFC.12H RDC=0.15 (Ohms) Equiv.Diam 2.0mm
L3=0.47 CFC.12V RDC=0.12 (Ohms) Equiv.Diam 2.0mm

 

[Inductor]

A link from diyAudio 2015
Mundorf MA30 Speaker Kits