Poll

Please indicate what kind of loudspeakers do you use in your main listening environment (RRP ZAR)

Small Bookshelf-below R20K
13 (9.6%)
Standmount Between R20-R50K
10 (7.4%)
Standmount between R50k-R100k
2 (1.5%)
Floorstander below R20k
32 (23.7%)
Floorstander between R20k-R50k
39 (28.9%)
Floorstander between R50K and R100K
12 (8.9%)
Floorstander over R100k
14 (10.4%)
Planars or electrostatics (can incl  conventional bass drivers)
10 (7.4%)
Horns (primarily based on typology)
3 (2.2%)

Total Members Voted: 135

Author Topic: Air Loudpeakers  (Read 43193 times)

Offline Stanp

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Re: Air Loudpeakers
« Reply #270 on: August 14, 2018, 06:17:54 PM »
Ah! I am with you now Stefan. We used to use cork sheeting at work for making gaskets. Both cork sheeting and Balsa would take glues and epoxies well. I think cork would resist compression more than Balsa.

Offline Atjan

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Re: Air Loudpeakers
« Reply #271 on: August 27, 2018, 12:35:03 AM »
Interesting stuff. From memory the 'made for purpose' composite cores are very expensive as mentioned. Something to keep in mind with balsa is that it needs some sanding etc. before laminating on a curved surface, adding to cost and affecting consistency. This should be adequately taken care of with a cork core as you get it in sheets.

Whilst the R&D is interesting and one learns much, I suppose its becoming pretty expensive by now. I for one am hoping to see the finished product soon!  :2thumbs:
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Offline Air

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Re: Air Loudpeakers
« Reply #272 on: August 27, 2018, 09:22:11 AM »
Hi Atjan, good to see you around and keeping an eye on our project :mates:

First some good news, we have made some progress with on the wood panels. The final programming to machine the mould that last one or 2 degrees was completed last week. So we now just waiting for a time slot with the 5 axis CNC machine. Hopefully, this will be the last round of refinement of the curvature of the mould.

Since my last post, I have done some extensive search on balsa products that we can use as a core material. I know that Vivid uses balsa and build the core bit by bit as they layup the shell of the G-range( Pictures are on their facebook page if you scroll right down). However, I think this approach could time-consuming and could lead to inconsistencies as it requires a very skilled workforce. We want to standardise the process a bit more.

Fortunately, I found a material from Europe that I also traced in SA that is made of a sheet of balsa blocks in varies grades and thickness. We are awaiting samples to do 2 carcasses with. The upside is that theses sheet are substantially cheaper than the Nomex Honeycomb material. We just want to look at how it drapes over the Vivace curves and how much resin it absorbs. It is certainly a good alternative to the more expensive kevlar product from DuPont.

Seems that the delay in the process brings some nice surprises and benefits. The R&D is expensive for sure and the budget is stretched at the moment. On the bright side, however, is that we find some cost savings in the productions process. Time in itself also brings a cost to the project....

Here is a pic of the balsa sheet(not the specific one that we will use but it gives an idea of the way the blocks are cut, selected and then made into a sheet that can be draped around a radius).






Offline Atjan

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Re: Air Loudpeakers
« Reply #273 on: August 27, 2018, 12:29:36 PM »
Yep, that's the same balsa sheets we for boat building in CT. I'm pretty sure I can get you in touch with some local expertise on the matter if you need it.
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Offline Air

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Re: Air Loudpeakers
« Reply #274 on: August 27, 2018, 01:05:54 PM »
Great, thanks Atjan. I think you might as well send me the details.


Offline Air

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Re: Air Loudpeakers
« Reply #275 on: September 20, 2018, 11:53:27 AM »
My 2 months of travelling for work and family commitments are drawing to an end and hopefully, I will be able to drive our project a bit more in a concerted way forward and push our suppliers a bit harder. Maybe we have an approach of being the nice guys and therefore we get nowhere..  :ticked:

We are making small strides but it is really now getting to a point where we need more action on the bigger hurdles which is mainly timeslots in the production planning of our suppliers.

In past few months(whilst travelling), I have also put my head down to try and think how we can "commercialise" the work we have done to a greater extent. I realise that the Vivace with all its complexities will be an expensive product, but hopefully, it will still be high on the value curve compared to the benchmarks that we have for the design. So I was looking at more scaled down designs that we still would be proud to make and offer to the market. I have in the past mentioned the Voce and small monitor design, sort of a small statement product and the Evocatuer, a high-efficiency design. These 2 concepts are alive and well and work have been done in this regard. However, both of these 2 concepts are still nice products and I believe a more affordable product that might have broader appeal and market segment is required.

So that was the challenge, and I also wanted to stay true to our design values, and make use of the tooling that we developed for the VivacÚ. I won't go into all the details and thinking behind the new concept as I will with time start a different thread when the time is ready but I am quite satisfied with what we came up with. I looked critically at the aspects that drive the cost in the Vivace design up and tried to find ways to circumvent the cost without compromising too much on the SQ. I didn't want to scale the Vivace down with lesser drivers, smaller bass unit etc. So the idea is a range of speakers(3 maybe) that will be 2-way MTM and 2.5-way designs. There will be cost savings with the drivers and crossovers but also in the cabinet construction. However, they will still be all Airloudspeakers in their core. The range's code name is Dancers and might look something like this. I realise this might seems as if we are starting something new before the previous concept is finished but for me, it creates additional inspiration to push through the last part of the Vivace design as the elements can be used to create the benefit of scale. I will rather drown in an ocean than a bathtub...  :Whoohoo:




« Last Edit: September 20, 2018, 12:05:03 PM by Air »

Offline gavinbirss

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Re: Air Loudpeakers
« Reply #276 on: September 20, 2018, 05:09:41 PM »
@Stefan,

I will happily lend a "ear" to the prototypes.

Hope we hear them sooner than later, best of luck

Offline Stanp

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Re: Air Loudpeakers
« Reply #277 on: September 25, 2018, 12:38:55 AM »
Great news Stefan. I am sure with your knowledge, dedication and patience, the outcome will be wonderful. Hope to hear them one day  :thumbs: