Synergy / MEH horns a new system

Lighter work today and a quick repaint of the outer flares and she’s in place.

Marie loves the colours.
Does make much more of a feature of the MEH attributes and I like the colour too.

In progress

Bitched up :slightly_smiling_face:

12" of heaviness. First one removed from the SH50 donor.

All loaded/ wired up.
Vitavox S2 aligned and fitted.

Lifted into position.

@coco can you see the difference in horn angle?

Time to sit back and listen SH50 Vs SH60.

Interestingly the 4 MF drivers on the left SH50 are wired for 8ohm. The 2 on the SH60 are 4ohm.
This audibly gives about the same volume.

Don’t even need to measure and adjust in Najda for that.

The DSP PEQs timing delays etc seem to sound fine too - The 1/4 wavelength driver distance is the same, same drivers.

On to the 2nd one. No rest for the…

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perfectionist!

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Madman ? :slightly_smiling_face:

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It’s only temporary though.

Worked away, some blood sweat and :flexed_biceps:

These weigh in at 55kgs each, up loft room stairs🥵

Here they are together

This is image enhanced

As the camera took it.

In real life they don’t look so red. Just terracotta.

Sound wise..
After a fair bit of listening to the SH60 alikes
They sound a bit more open and even more even than the SH50s.
It’s subtle but there.

I did have to reduce the dB level a little on the MF drivers.

2 X 5" drivers at 4ohm > than 4 X 5" drivers at 8ohm!

There’s a more solid stereo image / central vocal when it’s mixed that way, yet the out wide dynamics, tone and pump are still there.

I played various test my tracks and was wowed.
Made sure to listen over 2 nights to different things to avoid the initial wow factor I can suffer from, and then return back down to earth later😂
That return back down didn’t happen.
They are good!

Wife listened to her favourites and simply said, “you’ve nailed it”.

A test track I use for midrange soul / life likeness is the clarinet solo from the remastered Duke Ellington and Louis Armstrong Together recordings..

That solo sounded amazing on my old round horn system. The JBL 2482 Alnico / Phenolic compression drivers on the perfect size T200 horn for those frequencies, brought it to life like it was in the room. Rare experience.
However, other things they did not do so well.. definitely not point source evenness.

The SH60s got that emotion and feel going nicely.

You’d think 50° to 60° wouldn’t make much difference - bit it does in my room.

All to do with the sound waves interacting with each other and the room..
Angles do matter apparently.

My room doesn’t suit Tractrix / Le Cléach (there’s not enough room and too many reflections I guess + plus the narrow throats sound..

The 60° horn angle opens things up nicely but not too much.

2 X 5" MFs with the tap holes a little farther apart sound just fine.
Don’t at all feel the need for 4..

Can’t explain it better than that, at the moment.

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Being the restless kind I got to thinking, my little SET amp on the previous MF Tractrix T200 setup with JBL2482s was driving a16ohm load..
Let’s try the 2 X MF Celestion 5" at 16ohm instead!

Down with the cabs again, remove the covers, rewire.. put back in place​:flexed_biceps::flexed_biceps::flexed_biceps:

I’ve still yet to listen to that enough to really decide, but initial thoughts are smoother?!

Meanwhile here’s a couple of closer up pics in natural light

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You may have started a trend of angle changes, from Instagram

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Nah, just a carpenters angle thing, school protractor, and slide rule😂
Manual throating is essential :hushed_face:

Added: but for the modern hifi DIY’er it looks great.

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This is pre MEH conversion :joy:

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That’s what the modelling and AI is for :zany_face:

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On to a bit of measuring of the new SH60 horns.

Vitavox S2 HF

That will do nicely.
Giving plenty of HF extension for my ears😂

MF just 2 X 5" drivers. Needed a little fix.
I guess it’s the tap recessing being slightly different - more than 2 Vs 4 drivers effect, but who knows?

Before

After

MF and HF together

Note how the phase ‘falls in’ nicely.

LF + MF + HF

Overall phase just came together without any time alignment changes needed.

Pleased with these.

The tapped horns come in at 55Hz (as @dom will testify🙂)

Will have a listen later and compare to the before changes.

I usually find the MF drivers way to pronounced with fairly level plots like these though. Easy to reduce.

Added: the measurement rig.
Mic at 1m from mouth.

500Hz room treatment tunnel to reduce room interaction

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Are you planning on swapping back after a bit? Or is the difference big enough?

Do you mean the setup or SH60 and SH50?

Between the 50 and 60