Manninen presents: Steel is Real

[manninen]

slightly smaller horn mount 40% done.

for phase plug im gonna use POM, alu could be better. inside voicecoil less inductance?

 

[manninen]

done, have to buy some black modeling clay to fill it up, jig saws angle is so loose result +/- 5degrees, at least drill were quite good.

 

[manninen]

phase plug partially done, i´ve measured 107mm from cone outer and inner to horn mouth, from cone 87mm, 20mm difference

Can it go to 4000hz with good phase response?

 

[manninen]

clayd and fitted to horn, think gonna take some quick measurements

 

[manninen]

first blood with random phase plug

reasonable phase curve

 

[manninen]

bit scaried starting to measure

 

[manninen]

plug is 60mm, random plug is 85mm and different shape.

Thinking what to do next

this is the random plug in same window size

 

[manninen]

That martin ring does its jobs 400-2100hz
this needs only one 3db notch

 

[manninen]

mouth is too large, maybe over 70cm2, i wanted it to be 50cm2

and path from cone to mouth is uneven

today i evolve my sharp plywood throat more into raw modeling clay way.
sand section B couple mm´s larger.

im gonna stick 400hz-2.2k range as tpl200h is ok with 2.2k

im bothered with 25y old jigsaw so gonna buy a new one

 

[manninen]

Slight mismatch second throat, have to sand it down little bit.

wanted to try something new so build a new sub, found rather good spot from the room so building another one

 

[manninen]

had to modify couch and there is no room for amp box anymore.

So build 6th order bandpass ampbox underneath cat tree, have to add one more exhaust fan, so 9 fans inside total.
But quiet it is

Stay away from these forced cooling amps