W8-2145?

[norman bates]

 

[norman bates]

I will have 2 of those blocks to raise the front edge.

 

[norman bates]

Ordered notch parts today.

38 year old receiver died after lasting a whopping 2 months after in for repair.

 

[norman bates]

have an l-pad (used as a 0 - 8ohm resistor), the 4.7uF and the 1mH.

Soldering circuit together tomorrow night, posting opinions on monday perhaps.

I've also been eyeing 15 band equalizers, they have a slide at 2.5khz (problem area for 8" drivers).

Saw this chart over on audiosciencereview............

 

[norman bates]

So far, so ok..............

Bass is an issue.
Perhaps because the driver is clear up at the top, or the 5khz+ is boosted, or just my ears really want it.
Run for music, I need to get the bass dialed in.
Maybe I should have gotten the 15 slider eq after all..................
Oh well, live and learn (or pay more money anyway, lol).

So, notch definitely helped, a lot.

And yes, 10 degrees at 10' makes a big difference, loss of high frequencies.

I think this is still "1 pair of ears speaker" at 10'.

 

[norman bates]

Nothing new, just some musings.

It is a lot different listening to music with only 1 speaker versus a pair.

https://www.audiosciencereview.com/...-center-channel-speakers-by-erin.30716/page-3

Those of you who have played with ambiophonics.
Cheaply done, move your speakers so they are side by side, then put a barrier between them extending from the speakers to your nose.

The center image is right there in front of you.
seperate the speakers, remove the barrier, and the voice is a hazy blob maybe 6db lower in level.

However, music is mixed on a stereo pair in front of you (basically mixing through this), so you will hear way too much midrange if you only use 1 loudspeaker (I think).




Anyway, pretty sure I'm happy with the notch values, I need to test the potentiometer to see exactly what value the resistor.

Next step would be dial in some baffle step (seems severe).
I may need an equalizer to really zoom on on where I want the knee to be.

 

[GM]

All this is a reminder of why I prefer over toe'd speaker layouts that cross at 'x' distance in front of my nose.

 

[Scottmoose]

I suspect Michael Gerzon would have agreed.

 

[Freedom666]

For better imaging.

Try to damp the box completely with felt on the front.

 

[norman bates]

On an 8" ?

 

[freddi]

play with a couple rectangle cardboard pieces and duct tape to hear BBC diffraction slot effects - may not be useful but a time-killer and perhaps some new perspective.

 

[Freedom666]

On an 8" ?

On the wooden front. First time reflections are damped.

It's worth a listen.

You can try some clothes for a listening test a scarf or the like.

 

[norman bates]

Ok, I ended up with 5ohms in parallel with the cap and inductor.

So 5ohms + 1mH + 4.7uF

Close to what someone on a german forum came up with, a little more resistance than for the actual cobra2 notch.


Next up, passive baffle step, or "bass boost" for my liking for music.
Currently I am way into a loudness knob setting......

 

[norman bates]

"however, the Altec by itself was no match for any of them in stereo."

Comparing a single altec in telefunken open baffle (open backed) to other stereo 8" full range drivers, on glow in the dark audio's review of the 755a.