Boombox ver.0.9

Last summer, they began to go to the basketball court with their child. He began to play street – so far one season. And I came up with the idea of ​​portable music, to the music somehow more dynamically.) I immediately discarded all kinds of JBL, I wanted something else – a ghetto boombox from the 80-00s. I figured it out from Japanese flea markets, ebay, etc., I wanted to do it in the old panasonic, sony case, there are a lot of them. Prices for this, more or less in fair condition, bite. I decided to make from scratch.
And that’s about half a year of effort.

Design. Wing 3D is simple and accessible.
In the process, I had to create not one model, but three versions. I want to note right away that I did not measure the
small parameters, I did not measure the final frequency response. I did the calculation of the case and speakers in JBL SpeakerShop and in WinISD, I also used other software for, for example, a filter.
Here applied bi-amping. To separate the frequencies, an active crossover was used – Butterworth filters of the 3rd order. (Audiokiller circuit and board).
Three amplifiers are used – two TPA3118 mono for tweeters and one TPA3116D2 stereo for bass.


An addition has been made for amplifiers, the click when turning on the power has been removed. I did The Giancarlo Circuit according to this scheme
Also for the TPA3118, the gain was reduced: Gain Setting.

The FLAC reader was used as a signal source.

The 0 resistors have been removed and the power supply has changed. in the food branch

I do not give a link to sellers, so there are plenty of them on Ali.))

Dayton DA-135-8 and Dayton ND25FW-4 drivers, store bought. The store is not bad, but not enough in stock, delivery is very tolerable.

The tone block on the LM1036 was used. Here it is:

He is phoning, here you need to either make your own or maybe someone will advise a ready-made timbre block.

The power supply is built-in, together with a battery (12 V 5 Ah). DC-DC is also used for bipolar crossover power.

Yes, there are many shortcomings and errors. There is a small background on the tweeters, most likely from the timbre block or from the wrong organization of the earth. But in such a hodgepodge, this is not surprising. You can wire and solder all the electronics yourself like this guy. guy Yes, and many, many others.

The body is 8mm plywood, glued with epoxy. That’s basically it. I do not pretend to HI-FI)). And the essence of this device is different. I like the sound. At first, the tweeters beat, in the crossover there is a setting for their level, adjusted it. Now the woofers are playing out and very well. What is the power? This is TPA3116 -18, power supply is 12 V. So count it.
Here is such a project. I’m planning a smaller system for 3" Dayton-