I am dying to find out the following:

1. Why such an eccentric choice of shape and materials?

2. What's the advantage of using ceramic vs standard materials like wood or plastics?

3. How was frequency response measured/what method/equipment was used?

4. Yeah, why no tweeter?

5. Where is the air aperture?

6. Is there rubber foam/feet to reduce resonance?

7. What kind of quality controls are in place to ensure that ceramic casing is identical, to ensure identical resonance, frequency response, absence of imperfections (hollows, bubbles, other inner deformities)?

I figure at price point of about $2300 USD (sans amp), it would be a very hard sell if you consider the competition in that pricepoint. Especially considering that there are rather acclaimed ADAMS available for nearly 50% less (and they are powered too).

Nice concept but as I am sure you already see, you have a lot of marketing/convincing left to do.

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The sphere design is to reduce standing waves inside the sealed box. (Sealed means theres no port or "air aperature") Standing waves cause resonance which forces the driver to push back on itself at half the wavelength of said resonance. That causes dips in the frequency response. Being a sealed design means they will have very good transient response but bass will suffer at louder volumes because of the power requirements and the size of the driver. A seperate woofer with these are a good idea.

You should read his website if you wanna know more.

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Originally posted by emc^2 I am dying to find out the following: 1. Why such an eccentric choice of shape and materials? 2. What's the advantage of using ceramic vs standard materials like wood or plastics? 3. How was frequency response measured/what method/equipment was used? 4. Yeah, why no tweeter? 5. Where is the air aperture? 6. Is there rubber foam/feet to reduce resonance? 7. What kind of quality controls are in place to ensure that ceramic casing is identical, to ensure identical resonance, frequency response, absence of imperfections (hollows, bubbles, other inner deformities)? I figure at price point of about $2300 USD (sans amp), it would be a very hard sell if you consider the competition in that pricepoint. Especially considering that there are rather acclaimed ADAMS available for nearly 50% less (and they are powered too). Nice concept but as I am sure you already see, you have a lot of marketing/convincing left to do.

hey there e=mc2

to answer your questions...

1. the shape is rather eccentric. there is an explaination on the website. ill give an overview (by the way, thanks camsr ) - the cabinet is shaped to direct and contain internal standing waves into a space where they are unable to interfere with the cone. the shape allows this space to convieniently be effective as part of the combined internal volume.

2. ceramic, as a material choice, allows a very (very) rigid form(compaired to plastics/wood). meaning next to no cabinet resonance and therefore an efficient and uncoloured sound. the ceramic process is a skilled process, but is more accessable for small quantity manufacture than say an injection moulded process (where moulds would be into the 10's of thousands of £'s). timber is not an option due to the organic form.

3. frequency response test was carried out by our driver manufacturer- in an enclosure of the same volume that we use. their chart goes by the classical british honesty - what you see is what you get. im pretty sure that large manufacturers spice up their figures - knowing their products will never be subjected to home tests that will prove their products to not perform like they say they do..

4. you dont need a tweeter when you have a driver that responds up to and beyond human hearing levels. you really have to hear this driver to belive its capabilities.

5. the cabinet is sealed. a port would provide a 3db increase to the lf output if we were to include one into the design, but a better overall performance will be had from the sealed design. if serious bass is an issue then a seperate lf cabinet from a respected company will make these usable in large studios. i recommend two models in one of my previous posts

6. the units come with removeable rubber feet. i am in process of devising a tilting system utilising a extendable rear foot for allowing the user to direct the units to the desired listening height..

7. each unit is caliberated to the exact same internal volume. this is done by measuring the internal volume of the cast(which does vary by a tiny amount in each cast), then adding counteracting amounts of wall thickness (concrete) until the collaberative internal vol is the same in each unit. bubbles are not an issue with the process

price is something that is an issue. but once we have the review we need that proves the functionality then people will trust. the non mass production and fresh ideas are our main selling points for now. when we have a review on paper we will have the audio credentials

cheers for the queries - it helps to know what possible customers are interested in.

rich

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Originally posted by richg101 3. frequency response test was carried out by our driver manufacturer- in an enclosure of the same volume that we use. their chart goes by the classical british honesty - what you see is what you get. im pretty sure that large manufacturers spice up their figures - knowing their products will never be subjected to home tests that will prove their products to not perform like they say they do.. rich

Hey Rich, do you feel that you should have the test carried out with the completed unit as opposed to just trusting the measurements caried out by driver manufacturer. As you stated the ceramic behaves differently to other materials, and would it not therefore alter the freq chart?

I'll be happy to listen to them for ya if ya wanna send them down under You pay freight of course

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of korse

a couple questions:
If these do well, do you think you will create a woofer to match them?
Do you think you will ever make a powered version?
Will there be a TA discount?
(the last one is a joke, unless you want to give one.)

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