Guitar + Bluetooth input -> Crossover -> Tweeter & subwoofer

beyound

New member
Hi,

I am designing a Bluetooth and Guitar speaker.

(1) Input:

1, Bluetooth Input (I2S)
2, Guitar Input (Line In, ADC)

(2) Merger / Mixer:

Merged into one channel.

(3) EQ:
for Frequency response of speakers.

(4) Crossover:
Crossover and output to tweeter and woofer (Crossover point: 3000hz)

Project of ADI ADAU1701 in Sigmastudio:
2.jpg

I used sigmastudio and adau1701 to implement it before, but I feel that the guitar sound is not very good. So I focus on teensy, but teensy seems to have no way to implement merge and crossover. Can someone tell me how to implement a similar design in Teensy Audio Design Tool?
 
Merge would be AudioMixer4, crossover filtering a couple of instances of AudioFilterBiquad, using Linkwitz/Riley 4th order perhaps?
Many online filter design tools are available that will take a filter spec and sampling rate and spit out biquadratic filter stages (aka second-order
stages) that can be plugged into AudioFilterBiquad.

However guitar inputs usually need high-impedance buffering as they expect much higher load impedances (1M or so) than standard line-level (47k).
 
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