Poll

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

Small Bookshelf-below R20K
9 (8%)
Standmount Between R20-R50K
9 (8%)
Standmount between R50k-R100k
2 (1.8%)
Floorstander below R20k
27 (23.9%)
Floorstander between R20k-R50k
33 (29.2%)
Floorstander between R50K and R100K
10 (8.8%)
Floorstander over R100k
12 (10.6%)
Planars or electrostatics (can incl  conventional bass drivers)
8 (7.1%)
Horns (primarily based on typology)
3 (2.7%)

Total Members Voted: 113

Author Topic: Air Loudpeakers  (Read 17682 times)

Offline gavinbirss

  • Trade Count: (0)
  • AVForums Veteran
  • *****
  • Posts: 1,103
Re: Air Loudpeakers
« Reply #180 on: January 04, 2017, 09:55:32 AM »
Is HP (high power) mode a switch on the crossover?

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #181 on: January 04, 2017, 10:11:58 AM »
Gavin,
A switch will be the easy way to implement this idea but I have in mind to have 3 binding posts, one for the negative connection, a positive for the DM(direct mode) and an alternate positive for the HP(high power). Both the low pass xover for the bass unit and the high pass xover for the mid unit are changed in the HP version. Both the crossover point and slopes will be effected.

Offline Atjan

  • Trade Count: (+10)
  • AVForums Veteran
  • *****
  • Posts: 11,225
Re: Air Loudpeakers
« Reply #182 on: January 10, 2017, 03:14:28 PM »
Hurry up! I can't wait to see this project completed. Too bad I'm missing out on hearing it.
It's only hifi people....

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #183 on: January 10, 2017, 06:14:29 PM »
Hurry up! I can't wait to see this project completed.
Atjan you have no idea on just how keen and excited we are to get it done. I try to curb my enthusiasm in dealing with all our suppliers not to put to much pressure on them. It takes some serious self-control but we want to bring all with us and make them all part of the vision and project.

Atjan, have a missed a post or 2? Are you no longer in SA but in Aus?

Maybe not very exciting but here are screenshots of the envisaged port. It will be molded and then slot in a similar aluminum machined flare at the opening to the outside at the back of the speaker. I find port tuning so very critical every time that I do experiments. It is influenced by many factors and simulations are only a start. Besides the crossover resistance stemming from the bass/midrange inductors, I also found that stuffing in the working enclosures is very critical as well as external factors such as different amps and placement. Because of this, We will make the port, at least the 1st unit or 2, in such a way that we can fine tune the port almost as the last part of the design when all else is done and dusted.




Offline HBAutomation

  • Trade Count: (+5)
  • AVForums Veteran
  • ***
  • Posts: 376
Re: Air Loudpeakers
« Reply #184 on: January 10, 2017, 08:39:14 PM »
Hurry up! I can't wait to see this project completed.
Me too!
Looks as though due diligence is at play and rightly so! Good luck with your endeavour. Looking forward to a spectacular review/s from all here!  :groovy:

Offline Atjan

  • Trade Count: (+10)
  • AVForums Veteran
  • *****
  • Posts: 11,225
Re: Air Loudpeakers
« Reply #185 on: January 11, 2017, 10:34:36 AM »
@Air
Yep, I jumped ship.  :D
It's only hifi people....

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #186 on: February 07, 2017, 12:24:42 PM »
Maybe time for a quick update:
1)We are pushing hard to get into the scheduling of the suppliers, especially for the Aluminium parts
2)Part of the chemicals required for the carbon fibre carcass was in short supply and its seems that SA Customs also did not play game- resolved now though
3)In the process of deciding on whether to machine an aluminium plug for the port's mould or whether we could get away with a 3rd printed plug to pull the mould from.
4)Waiting for 1st samples of anodising

The pic is a peep into the speaker; the bass driver, aluminium torque rods and brace, port and where the crossover will be fitted are visible



« Last Edit: February 07, 2017, 12:29:59 PM by Air »

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #187 on: March 01, 2017, 03:41:43 PM »
March may just be the month during which the Vivace will be born. :pray:

In the past month, we have made some minor refinements to the mould that is used to produce the carbon fibre carcas and this part is now within our tolerance level. We made a dummy part using glass fibre, and it was within spec and carbon versions will be made this week. We also decided on a 2 step production process, namely first the laying up the A side, moulding and then curing whereafter the core and the inner side (B) carbon layup will be done, once again moulded and cured. This is a bit more labour intensive, but the quality is so much better this way. We need to program the final cut outs and trimming of this part, but that should be relatively straight forward.

We are happy with all the aluminium parts, and more units will be machined next week.

We tested aluminium samples of powder coating, anodising as well as bead blasting the aluminium and then anodising it. Power coating is a safe option but is a bit dull and lifeless in our opinion. It does not make the best of the natural beauty of aluminium. Bead blasting alumunium creates a stunning finish that even tempted us to use it just like that.. but anodising the pre-treated surface is the way we will go in line with our design ideas.

The UPM Grada panels mould is currently reworked for the spring-back of the 13mm panel that we got on the 1st samples. 88.4 degrees gave an acceptable fit but we will give a 88.7-degree radius a try. We also will do samples with walnut now to see if veneering on side will have an impact on spring-back in the material. 

All these actions and corrections are enhancements, and we are confident that we can, even notwithstanding some improvements, assemble the speaker if we want to. No more.. will it work?

We have made progress with the port's design but still need to make a few more decisions. It will be a carbon moulded part, but not sure if the external flare will be machined from aluminium or whether we can are going to expose the carbon fibre maybe as a cheeky hint of what will never be visible to the listener, the advance monocoque carbon fibre structure around which the speaker is designed. 

Terminals, cross-over layout and other details are well advanced and although still not final, need not delay the 1st build. The same with signage etc. We have mapped a process of how we will assemble and this, of course, needs to be tested. It is quite intricate as there will probably only one of 2 ways of doing it. Recall besides the port and crossover there won't be a bolt, screw or any other fasteners in sight.

I am tempted to show you pics of our work, all the mistakes and changes but maybe at a later stage. Let me see if we cannot surprise you all
with photographs of the 1st production units later in March. Maybe even an initial auditioning of the 1st units for a few interested enthusiasts, not a formal launch but a sort of preview.  :dop: Knowing Alex and my style and personalities we will still make many improvements over the next few months, so no promises. Oh yes, quickly looked, and realised that I said in my 1st post in this thread it will be 2016... so yes no promises.  ;)



« Last Edit: March 01, 2017, 03:44:57 PM by Air »

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #188 on: March 07, 2017, 06:32:41 PM »
Just a slight diversion but I am really proud of Alex's work in 3d printing some of the scale models for the Cape Town's project to complete the uncompleted highways around CPT.  ;)
http://traveller24.news24.com/TravelPlanning/6-possible-ways-cape-towns-unfinished-freeway-bridges-will-be-transformed-20170307







Offline Atjan

  • Trade Count: (+10)
  • AVForums Veteran
  • *****
  • Posts: 11,225
Re: Air Loudpeakers
« Reply #189 on: April 22, 2017, 04:02:06 PM »
Isn't it time to update this thread with some speaker pictures?  :thinking:
It's only hifi people....

Offline Nidri

  • Trade Count: (+32)
  • AVForums Veteran
  • ***
  • Posts: 946
  • Don't panic.
Re: Air Loudpeakers
« Reply #190 on: April 22, 2017, 04:17:30 PM »
Isn't it time to update this thread with some speaker pictures?  :thinking:

I was thinking the same thing..

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #191 on: April 23, 2017, 09:32:41 AM »
Isn't it time to update this thread with some speaker pictures?  :thinking:

I was thinking the same thing..

Well, what's fair is fair!  Progress is snail paced but we are getting there.  ;)

So let me share some progress over and above my post in March.

Our main effort was to get to a point where we are happy with the port design. As said we will mould the port with Carbon Fibre but initially thought that we will do the mouth from aluminium. The cost of the matching was high and Mundorf advised we would do better if we don't put terminals on metal. So then we thought if we give a glimpse of the carbon fibre technology that will be invisible in the final product it will be cool.  We were unsure how well we can execute the aesthetics of the flare in carbon and wanted to test our partner's ability to do it to our standards. We started then of by 3d printing the flare of the port to test various ways of how the carbon cloth can be draped. So here is the 3d printed part and a few tests with draping the material.








With hand, and no vacuum it's not great but after speaking to specialists in the field we were sure that with vacuum the part can be made, and with a few attempts we would be able to get it to look nice as well(we were never doubtful about structural qualities). We also could use a less dense weave, satin weave that we would drape better but there is no stock of that available in the country. So we continued with machining the aluminium mould(only the outside flare).




Only this morning I received a photograph of the first carbon prototype. So next week we will do the rest of the mould in aluminium, we are sure we can pull it off with a bit of experimentation, and if need to with the lighter satin weave.



The wood cheeks are also in a process of refinement. The next pic illustrates the kickback of the 2nd iteration. We redid the mould and started to do the pressings with walnut veneer as we want to factor the effect of the veneer into the design. It is a time-consuming process of pressing samples, machining the mould on CNC with a few degrees of alteration and do some more pressings to see how close we are. I am expecting the next pressings in the next few days.



I will share a few pics of the baffles as soon as photobucket stop messing me around.  :headbanger:

So busy, busy but no speaker yet. Soon I hope, not years or months, hopefully, weeks.  ;)

Thanks for checking in.
Stefan

Offline Nidri

  • Trade Count: (+32)
  • AVForums Veteran
  • ***
  • Posts: 946
  • Don't panic.
Re: Air Loudpeakers
« Reply #192 on: April 23, 2017, 10:33:16 AM »
Thanks for the update.
What a Herculean endeavour.
Best wishes.
g

Offline Shonver

  • Trade Count: (+7)
  • AVForums Veteran
  • *****
  • Posts: 9,777
  • Criss-cross rhythms that explode with happiness
    • Elipse (under construction)
Re: Air Loudpeakers
« Reply #193 on: April 23, 2017, 12:06:42 PM »
So then we thought if we give a glimpse of the carbon fibre technology that will be invisible in the final product it will be cool.

Now, this kind of thinking I like! We know that there is no functional advantage to having the port made out of special materials, but I totally buy into the rationale you used in this case. It's the special touches, the ones with a story behind it, that contribute towards the mystique of a great product.
________________

DON'T PANIC
Capie

Offline Air

  • Commercial Member
  • Trade Count: (0)
  • ***
  • Posts: 490
  • Music lover and involved in industry
    • Airmusic
Re: Air Loudpeakers
« Reply #194 on: April 23, 2017, 01:18:46 PM »
Now, this kind of thinking I like! We know that there is no functional advantage to having the port made out of special materials, but I totally buy into the rationale you used in this case. It's the special touches, the ones with a story behind it, that contribute towards the mystique of a great product.

You've nailed and got it Shonver :dop: We try to use materials with purpose; functionally, aesthetically and economically. The port can be made from fibreglass, even moulded plastic but Carbon is perhaps a playful hint of the substructure and does add too much cost over other options.

The aluminium mould is long term investment. It can be used in other models and allows for some flexibility to fine tune the vented alignment as it will be moulded in 3 parts; the mouth, the tube with its knee and the internal mouth with flare.