Passive Audio Amps For Smart Phones

Small Brass Horns — Exotic Wood Base


By Daniel Jansson

 


By Brad Dye

These are acoustic amplifiers for smartphones. They don't need electric power to operate and there are no moving parts. It works like a megaphone (speaking-trumpet, bullhorn, blowhorn, or loudhailer). Everyone that I have shown it to has said something like “Wow, I want one of those!” So I am building a few of them.

Of course there are more “Hi-Fi” ways to listen to audio on your smartphone but who would want to plug an elegant smartphone into some cheap, plastic gadget? Or even use Wi-Fi or Bluetooth, which are a pain in the neck to set up, even on a smartphone.

These will be made with hardwood bases and some of them will be exotic hardwoods with interesting grain patterns. The horns are polished brass — made from mostly old horns that had rubber bulbs on the ends and were used in “times gone by” by taxis and even clowns in circuses. These horns have been re-purposed, reshaped, and re-polished.

Of course when not listening to music or other interesting audio, you can appreciate it for its beauty, it looks just plain cool. This is a work of art.

Sorry to say that I didn't design this myself. It was designed by Daniel Jansson in Sweden. He is a graduate of Umeå Institute of Design with an MFA degree in Interactive Design.

If you see a horn that catches your fancy let me know and I will build an amp for you.


By Brad Dye

Click here to enlarge the above image.


 

Pricing

Small Brass Horn Hardwood base. $199
Medium Brass Horn Hardwood base. $249
Large Brass Horn Hardwood base. $299
Gramophone Features — fancy American walnut base — gunstock quality — medium-walnut Danish oil finish then followed by ten coats of semi-gloss polyurethane — hand sanded between coats. $599
Polished Cow Horn Design not yet finalized. $149
Horn of Plenty (Cornucopia) Popular model, temporarily out of stock. $399

Trombone Player

This has a large wooden base covered with beautiful African Zebrawood wood veneer and filled with 25 lbs of lead shot for stability and vibration damping. With several coats of semi-gloss polyurethane finish. $599
Prices do not include the cost of shipping—to be billed at actual cost.

For questions or to order, click here . left arrow


By Brad Dye

Trombone

This Zebrawood wood veneer trombone player is beautiful. It has been finished now and I believe it is the best one I have done so far. I have an idea about how it can be safely shipped in two boxes without too much cost. The USPS will accept a box weighing up to 40 pounds so I can put the base in one box and the horn in another. I will use construction foam to fill in the voids.

Zebrawood From equatorial western Africa, Zebrawood is usually logged by hand with a hundred men or more on mountain slopes. One of the most appealing features of Zebra is the exotic appearance of the colorful grain. Black & golden lines make this an excellent choice for many projects. For ease in finishing, use a sanding sealer to seal the open pores. Zebra has interlocking grain that can produce beautiful iridescence in quartersawn boards! [...] Uses include: furniture, cabinets, architectural applications (veneer), turned articles, rifle stocks, and boxes. [ source ]


By Brad Dye

Gramophone

Features — fancy American walnut base — gunstock quality — medium-walnut Danish oil finish then followed by ten coats of semi-gloss polyurethane — hand sanded between coats.



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