New "Kinoshita" type build

[Brendanaudio1]

Hi hollow. Thanks for that. Dayton Audio products are not freely available is South Africa and have to be imported. Our customs are very slow and average 12 weeks. The jig was not that complex, and I don’t mind as I get to learn a lot through the experience. I have been in this hobby for about 8 years, starting off knowing how to fit a mains plug, to where I have successfully built, with some assistance, 3 passpabs amplifiers. ,f3,f5, and aleph x 100w monos. I don’t mind doing the work now, as I would love to replace the dsp with a full passive in the future. But. For now, to get the dsp right is going to be marvelous. Thanks again

 

[hollowboy]

Hi hollow. Thanks for that. Dayton Audio products are not freely available is South Africa and have to be imported. Our customs are very slow and average 12 weeks.

Wow. I had no idea.

I have successfully built, with some assistance, 3 passpabs amplifiers. ,f3,f5, and aleph x 100w monos.

OK, my bad assumption. I didn't realise you were good with electronics.

I would love to replace the dsp with a full passive in the future.

IMO, the only downside to an good active system is the cabling & lack of portability.

...but I don't get the valve / boutique amp thing either. I'm one of those unrefined people who think that electronics, cables and whatnot are interchangeable (if good), and faulty if they are not.

 

[Brendanaudio1]

Not an electronics expert, takes me 5 times longer than most, and still need expert assistance with biasing, and all those things, but willing to learn

 

[AllenB]

approx 45 degrees off axis directly in the centre of The speakers.
...
correction filters

I assume then that you have the speakers pointed down the room. This can assist near same wall reflections.

The problem with measuring and correcting is that it doesn't undo the reflections. The combination of the direct and reflected sound can alter the response, which can be compensated, but reflections also have direction and timing which is a job that is sometimes handled by a waveguide/horn, and speaker positioning.

 

[AllenB]

f3,f5, and aleph

Nice. I went Zen for a couple of years in the early days.

 

[Brendanaudio1]

:The speakers are straight forward facing. On the one side, the room is open plan, and on the other, I have a 2mx1m diffuser panel, also built by me
I just sit flush centre, about 45 degrees, as that is where the sweet spot is.

 

[AllenB]

This can assist near same wall reflections.

Didn't mean this to sound like it was a positive thing.

 

[Brendanaudio1]

I hear you, never assumed that. My room does have degrees of treatment, so is not too "LIVE". When I do the measurements again tommorow,the accurite ones, I'm sure you will pick up the effects of the reflections.

 

[picowallspeaker]

That's a fish in the ocean

 

[Brendanaudio1]

Have other goods up as well. Still constructing more. Have a total of 10 square meters for my back wall. Thick velvet drapes, with acoustic backing on the one side wall, and 2 ceiling panels to handle points of first reflection. Not much for bass treatment though

The photo was just to show what I had made ��

 

[AllenB]

Bass treatment is a big effort. Better to go with this.

 

[Brendanaudio1]

I have an extra 3 Beyma G40D 15" bass drivers. Maybe I must put them to use. MY GOOD LORD

They are the 15g400

 

[Brendanaudio1]

Hi Guys
so I have been busy trying to get the measurements done more accurately.
The levels for all drivers were matched, and individual driver measurements were done with no filtering, as requested by a few. I made up the impedance measuring jig, but am battling with it. Can't seem so get it right yet. I will continue trying over the next week, but making me mad at the moment.

 

[Brendanaudio1]

I see that portion of the measurements were cut off, try again, see attached

 

[Brendanaudio1]

EarlK, Hollowboy, AllenB, Lojzek, please help me out here. I am now getting desparate

 

[EarlK]

Brendan,

I would suggest NOT POSTING any more pics ( jpgs ) and only posting exported .txt files ( of each measurement made ).

Those pics are really quite useless.

You might as well let others post pics with meaningful vertical scales.

 

[TNT]

In REW, hoover to the left over the y-axis. 2 small magnifying glasses appear. Set the range for the "dB" to be 50 dB top-down.

You are just trying to make the curves nice by using 200 dB range

//

 

[Brendanaudio1]

As instructed, the measurements as text files

 

[Lojzek]

Hey, I have posted an impedance jig in post #4 that works accurately in ARTA. Try it.

Problems with impedance measurement

 

[TNT]

This is what you should look at.