This loudspeaker built with using three low / mid range speakers and two tweeter and based on "Open box" design with using some horn elements. It copies the typical design of the old radio and reel-to-reel equipment where speakers were in the same box with PCBs and mechanical parts. All of these parts organized the internal space something like acoustic labyrinth or specific horns, that is gave a special sound to these speakers. Please note there were no any additional calculation of the acoustic space.
In this construction I used old dynamic speakers with paper cone which were widely used in mid range soviet audio equipment in those years. This is well known pair of broadband speaker 5gdsh-3 (3gd-42) and tweeter 3gdv-1 (2gd-36). The 5gdsh-3 and 3gdv-1 speakers are connected in series with each other. 5gdsh-3 speakers connected directly to the amplifier output. 3gdv-1 speaker connected through 3uF non-polarized capacitor.
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The main benefit of this loudspeaker with using together with tube reel-to-reel tape recorder will be the possibility of obtaining the most realistic and authentic sound of the Mellotron when using any samples.
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The recording device that I plan to use is the old soviet tube reel-to-reel tape machine "DAINA 3-29" manufactured in 1969. This is one track two side monophonic recorder with Single-ended tube amplifier on 6P14P (similar to EL84, 6BQ5) tube. It uses tape 1/4" on 3,3/4 ips (9.5 cm/s).
I plan record wide range of samples from modern synthesizers to natural sounds to the old "Cellulose acetate" magnetic tape (similar to 3M/Scotch 111 Magnetic tape) on this tape machine. Next I will playback these records and get two types of the final hi-res samples first from the line output and second recorded from this loudspeaker thru microphones. I will use these samples in my apps with the audio engine that was specially designed to most accurate reproduce the sound of old analogue synthesizers.
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This loudspeaker was designed in OpenSCAD software for laser or milling cutter and can be easily adapted for any other speakers and the size of box. You can download source file with complete design from GitHub
https://github.com/zzzwiw/vintage-loudspeaker
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