Help to choose the ultimate midrange driver

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#263
Get it, the closer the better.

Now when we are talking about tilted driver speakers like kef105.

Some is also tilted the other direction
Focal Grade Utopia BE Loud Speakers for example

I tried this tilt and i think it improved the sound


puppet said:
I'd think that would have to do with the crossover frequency as to what you can get away with. As the frequency rises, the vertical directivity narrows. Measure near the ribbon and you get a feel for how much. I'd just get as close together as you can with AMT's.

Looking at your pic on the previous page I'd say you can/should get the mid/AMT closer together. Maybe along the line of what the KEF 105 does.
Click to expand...
 
#264
dahlenmarcus said:
When we are talking about CTC distance, how about planar drivers such as amt or ribbons?
Those are used in arrays with the argument that the dispersion is limited.

How would i calculate proper distance with planars?
Click to expand...

Basically for the tweeter you start at the closest end (diaphragm edge) to the midrange.

Usually the midrange is the one to worry about more because of it's more "point-source" nature relative to the size of the driver's diameter.

Don't forget about typical vertical dispersion losses though with each driver for a given angle.
 
#265
Distance is defenetely something to look more into, just need to manage the phases in s Good way.

Now i am very happy with the AE speakers, the infinite baffle 18 is amazing. It makes the sound so complete by providing the absolute deepest notes. Fs is 18hz

If i didn't make an active system i never would have been able to adjust it to this level, it's very good.


The spa is almost complete but sound system is missing,
Humidity is very high here.
What do you think, Will the drivers be killed?

Im thinking of an active system with the leftovers
Somtak 15
Visaton ti 100
B&c de250

Dropbox - IMG_20201213_161724.jpg - Simplify your life
 
#266
Yeah, that sort/(amount) of humidity isn't good.

My guess is that the diaphragm's shouldn't have a problem (the AE is doped, yes?), but I tend to worry about the spider with that amount of humidity (at least long-term). It's also not good for the magnets/iron. You might also end-up oxidizing the pole-piece & VC a LOT faster - and oxidation might be a problem with the AMT.
 
#270
Hello everyone!

I have been trying different configurations, now I'm using upwards firing drivers also =)

I ordered an extra IB 18 sub and a stronger Amp, looking forward to install it!

Do you think that I should try to build filters with capacitors and so on?

I like changing the sound and to go for a fixed configuration would make it harder.
On the other hand many people say an active system can never compare to a traditional filter.

I would like to try some tube amps sometime also


Dropbox - IMG_20210630_193140.jpg - Simplify your life

Best regards =)
 
#271
Nice!
You can do a calculation for group delay. I did a measure with a mic to sweetspot and got this for
a 3way with one half horn, even the bass got some over the tweeter (0.16).

jpg: L channel, 12db LR, bass mid tweet. (Open drc da-8)
 

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#276
Hello,

Any update on the ultimate medium ?

I have a system using a beyma 12b100r, a great medium BC 6md38 and a Audax 38mm tweeter.

I chose this setup because it has a little bit of the spirit of the wide range because such mediums can be used between 300 and 3khz...

I would like to try the faital 6pr160 which looks great on paper and was tested by a famous engineer with good results. It's the same philosophy as the 6md38. Troels used the 6rs140 but I think the 6pr160 is better suited for used after 300hz...

I might want to try a tweeter with a proper waveguide, the beryllium SB ? SEAS E0055-06 ?

By the way, how do you box those mediums, openbaffle, sealed ? I am using an osb open baffle but I should think of something more compliant...

Regards Greg
 
#278
Hi Greg,

if you are looking for an ultimate 6.5inch midrange your search might end here:

Purifi 6.5" Midrange

They are expensive but this is not a surprise on this quality level.

I'm strongly considering buying this driver, I only hesitate because I'm not sure if the announced 5.25inch driver would fit better to my needs due to the better dispersion.

Regards
Matthias
 
#279
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#280
usa_satriani said:
Yes thanks for your reply,

The guy I was talking about actually reviewed this speaker
https://audioxpress.com/article/tes...udio-6-5-midbass-transducer-from-purifi-audio
I have to check what is aperiodic....

I am continuing my tests with open baffle for mids and highs, easier to change things and good results so far...

Edit : this could be helpful too
https://www.erinsaudiocorner.com/loudspeakers/march_audio_sointuva/As they use also a tweeter I am interested in.

I
Click to expand...

Hi Greg,

this is not the driver I was referring to.

The test you mention is about the 'extended woofer' version of this driver family.
It's the PTT6.5X04-NFA-01

I was actually talking about the recently released 'midrange version': PTT6.5M04-NFA-01

It is a dedicated midrange driver which has compared to the above mentioned driver less xmax, less mms, but therefore higher sensitivity and some other different details.
So its really designed for midrange use.

Other (smaller) midrange drivers are in the pipeline, like mentioned by Lars Risbo from Purifi in this thread: https://www.diyaudio.com/community/threads/exploring-purifi-woofer-speaker-builds.352063/

Yet, I have not found a test which is about the midrange driver, but Troels Gravesen has already used it and wrote some short comments about it:
http://www.troelsgravesen.dk/Purifi-6661.htm

Best regards
Matthias
 
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