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Joror's DIY Audio projects

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Joror's DIY Audio projects

Postby jororaitchev » November 14th, 2019, 5:02 am

I will start the presentation with one project, which is in the initial phase, but has undergone several conceptual changes-"J&N"-2.
In order to save your time, I will allow myself a clarification:
-Everything in this project- idea, design the filters and the overall workmanship of the cabinets to the last detail was done by my hands.Not used "CNC" machine and 3D program.
First option:
I started with measurement simulations;
N-1 graph characteristics of the speaker without filter,we have a peak of 106 dB. N-2 graph shows the transfer characteristic of the filter in the frequency band 50-100 Hz is above the 0 dB level. It is useful to understand why in the passive filter the transmission ratio is greater than one? The answer to this question is given by a comparison of the input resistances . The minimum value of the input resistance of the speakers with filters (red curve) at a frequency of 90 Hz is 3.2 ohms. This is an acceptable value. If I select the cutoff frequency of the filter below, for example 200Hz, the input resistance will decrease to about 2 ohms. This will be too much load on the amplifier. The costs of creating or acquiring such an amplifier will be unacceptably high. A decrease in volume will also lead to a decrease in the input resistance, but to a lesser extent.
N-3 graph shows the sound pressure of 90dB of two W26FX001 speakers with a filter at an input voltage of 2.83V. It's not hard to guess that if we simulate the filter for the W18EX001 speaker, we will get a sound pressure of no more than 86 dB at an input voltage of 2.83 V. If we remain in the concept of building an AS with filters on passive elements, we will have to reconsider the choice of the mid-frequency dynamics, or to refuse 1 woofer speakers- W26FX001.

I've exhausted the attachment limit, I will continue ...
J&N- 2.jpg

N-.jpg

I have restrictions, I'm sorry!
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jororaitchev
 
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Re: Joror's DIY Audio projects

Postby jororaitchev » November 15th, 2019, 9:35 am

In fact, what does the project matter? Here is the end result:
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jororaitchev
 
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