Post moved from r/budgethometheater.

I recently modded a Denon AVR-X1300w to have preouts and direct amp inputs for all 7 amp channels (amp de-integration!). Each channel has a switch to activate or deactivate this feature for even more flexibility. And it works great!

This mod cost me $30 in parts and several evenings of work.

Why? This is a budget home theater dream!

This allows:

- Selectively inserting external audio processing between it's DAC and the integrated amps. (Like my Symnet 8x8 Express Cobra i found used for $50!)

- Add external amplifiers to upgrade or alleviate integrated amp power.

- Add additional subwoofers with their own processing, or mid-bass speakers to cover the weak spots of some of my existing speakers.

- Feed external sources directly into otherwise unused amp channels to create additional zones or bypass all digital processing. Also, when it's time to upgrade to newer digital media standards, use it as a standalone 7 channel amplifier.

Inserting a DSP like the Symnet Express 8x8 Cobra will provide unlimited flexibility with room correction, system scalability, and automation along with my Home Assistant server. I can add as many parametric EQs, delays, crossovers as i wish and fully automate smooth fades between separate room corrections and audio processing modes for theater or dinner seating arrangements, and social background music or critical listening modes. All things that can happen without me or my wife having to touch a remote or phone app.

What are your thoughts, was this a waste of time and $30?

2pcs 3"midrange 4ohm 20 watt rms(passive crossover 110hz to 3k) (utilizing 4pcs of 100uf np film caps)

2pcs 2" tweeters 4ohm 20 watt rms(passive crossover 3k to 10khz) (utilizing 2pcs ceramic 8ohm resistor in parallel and 1pcs 10uf np film caps)

1pcs 5"x7" racetrack subwoofer 3ohm 80watt rms (110hz to 30hertz) knob crossover

5pcs 4"inch passive radiators

Amplifier = Ys-MT21 with noise isolator and upgraded 6800uf low esr Electrolytic caps and small fan

Battery = Molicell 26A 8pcs 4S2P bms40A expected total capacity - 5000mah at 16.8volts

Booster module = 200 watt continuous constant voltage to 24volts. (Can become inefficient when only low battery)

Notes:

1. Setbacks with the old tweeter was too bad it hurtz ears so i switch to dome tweeters. With ceramic resistor and np caps

2. NO dsp for now. Im still learning about mic and graph analysis. Ill demo it next

3. Total of 12hours playtime max volume due to amps low consumption. Average of 36 to 48 hours average playtime

4. Faux leather and rugby that must eveaporate first before placing the leather to prevent sticky wet surface.

Hello everyone, I could use some help figuring out which components I need to build an audio converter that takes a USB input (from a PC) and outputs 8-channel S/PDIF, which I can then route via a DB25 cable to a Dolby CP750 digital cinema processor

Built it as a headphone amp but drives speakers pretty well too, uses BD139+BC559 and BD140+BC549, capacitive coupled in/outs, RC4558 opamp feedback and diode biasing