Who makes the lowest distortion speaker drivers

[Zero D]

@ jerryo

Thanx for the info. Seems like you got a bargain, in that condition What colour are the cones ?

It would be helpful if you could post an image of the impulse graph, so others can see how good it is I have one somewhere, but it's at another location, miles away.

 

[turk 182]

You do realize that I was Director of Engineering for a microphone company for several years! How many mics have you designed? I'll stand by my statement.

so which models are your designs?

 

[jerryo]

Zero D

They have silver cones......I’ll have to photo the graphs and post........

 

[soongsc]

Zero D

They have silver cones......I’ll have to photo the graphs and post........

Bandors are normally gold color with sort of flat dome dust cap. Jordan’s are normally aluminum color with a cone type dust cap. Yours might be special.

 

[jerryo]

Here we have the specs. and graphs for the Bandor 50 units Hope you can see enough to of use!

 

[soongsc]

It says gold anodized...

 

[jerryo]

Indeed, but they look more silver to the eye! Perhaps it’s the light in my workshop.

 

[gedlee]

this deserves a thread of it's own there is just so much wrong with that it's astounding.

back to low distortion in loudspeakers...

I'd disagree.

As you minimise capsule size, the noise levels must increase. With studios routinely applying 20-30dB of compression, that can start to become a problem.

The dynamic mics I've worked on have of the order of 1mm Xmax. Since they're sometimes subject to SPLs of the order of 150dB, I suspect that gets used in full from time-to-time.

Happy to start a new thread on this. I think it'd be an interesting discussion.

Chris

so which models are your designs?

This should be a new thread, its starting to descend into the usual negativity.

 

[Bill poster]

Hi ZeroD,
they were on eBay and are in near perfect condition. Especially the cones which are extremely vulnerable to damage. I paid £40.00 approx. for the pair. I’m quite happy with this and am looking forward to hearing what they can do.

What.. If they are in good working order you have a real bargain there. The cone design is as good as any full range today and bandor were first to use anodized metal cones. Imo the treble and upper mids betters the small jordans and mark audio drivers

 

[jerryo]

Bill Poster..........£20.00 each plus postage is worthwhile for a bit of unique handmade audio history. A moving mass of 2 grams gives a great impulse response so they should be very nice to listen too. Crossover is around 150Hz although a tad higher might be worth it. I have some Hi-Vi D 6.8 mid/bass drivers that might work well with these for the bottom end.

 

[scottjoplin]

Interesting, I have Jordan Eikona crossed at 125Hz to HiVi M12 woofers. What enclosure do you have them in?

 

[jerryo]

No enclosure yet.....just got them recently so working on non-parallel sided 2 litre box of some sort......I have two 30 cm diameter spheres made of 25mm thick plaster that have an internal volume of 7 litres that I could modify to accommodate these drivers. Non- parallel sides could be made internally, reducing the volume to two litres. As good as it gets diffraction externally from the spherical surface with these drivers mght yield some interesting results!

 

[scottjoplin]

Since you are going to use woofers, which of course is a splendid idea, why not put them in an OB so as not to introduce any DISTORTION

 

[33Polkhigh]

Law of physics always wins versus marketing, and all loudspeakers drivers are designed to achieve a low THD rate.

According to Zaph's tests satori/sbacoustics drivers have low non-linear distortion.

The second statement is just wrong, some are designed for large bandwidth, some for flatter response over a given, some for high power handling, some for low non-linear but acceptable linear distortion.

Dynavox makes a driver that has a very flat response and a natural roll-off, great for series crossovers. What is the non-linear distortion? IDK but probably not great.

BTW I do have "array" speakers and I would say they have noticeably low distortion, but some of that is the distribution of sound energy over a wider area and lack of floor ceiling bounce, which creates a smooth spacious effect. Recommended if you have the space.

 

[jerryo]

Which.....?
Bandors need sealed and Hi-Vi D6.8 need ported to go to 30Hz

 

[scottjoplin]

The Bandors. Why do they need sealed?

 

[jerryo]

I believe, to protect them against over excursion as the cones are very delicate, but also because this is the recommended loading from Doreen Bance, the designer. Might be worth trying out ‘naked’ nonetheless with limited power to see if it would work.

 

[scottjoplin]

The Xmax isn't on that spec sheet by the look of it? If you cross about 200Hz it should be safer and worth experimenting with. Also with such a small driver the box would also have to be very small to offer any protection

 

[jerryo]

The recommended box is between 1.5 and 2 litres as far as I know. I’ll test them with a Dayton Audio Woofer Testerto check T/S parameters but I’ll avoid using the ‘added mass’ technique for VAS because of the cone fragility.
I’m not going to try and fill a large room with sound so I’ll probably only put a few watts through them. I have most of the necessary to build an ACA Class A which will power these perfectly.

How do you find the Eikona’s?

 

[scottjoplin]

I'm very happy with them, I've had them for a few years (the original UK made version), I never find them tiring. I built the VTL cabinet for them but with a removable rear panel so I had the option to use them OB as well, this is how I listen to them exclusively now