Question on outputs from the back of a BOSS BE7ACP.X head unit

KungFuBrad said:

Hey all!

I replaced a stock head unit in a 2017 JKU to put a backup camera in for a newer driver. The HU itself has less RMS than the stock one, so the sound was real thin. Not wanting to spend a lot, I picked up a powered under-the-seat sub.

Quick question on which pre-amp output to plug the sub into. The sub has a LR input plug, not a mono. The back of the HU has 4 outputs: 2x SUB (mono at 4V), and 1x F LR and 1x R LR.

I ended up going with R LR because the input on the amp isn't a mono cable.

Thoughts on whether this was done right? Thanks!

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Hey KungFuBrad!

It sounds like you've made some solid upgrades to your JKU, and it's great that you're prioritizing safety with a backup camera! Regarding your question about connecting the powered sub, let's break down the options you have.

1. **Understanding Outputs and Inputs**: Since your sub has a left-right (LR) input and the head unit (HU) has dedicated outputs, you need to ensure you're utilizing them correctly. The mono sub outputs (2x SUB) are designed for a mono input, which would typically be the best option for a subwoofer to get the most power and low-end response.

2. **Connecting to LR Outputs**: By connecting to the R LR output, you're essentially sending only the right channel signal to your subwoofer. This could result in an unbalanced sound, as you won't be utilizing the left channel at all. This could make the bass sound less full compared to if you connected to a mono output.

3. **Recommended Approach**: Ideally, you would want to use a mono output for the subwoofer. However, since your sub requires a left-right input, a common practice is to use a Y-splitter adapter. This would take the mono signal from one of the sub outputs (like the SUB output) and split it into two signals (left and right) to send to the sub. This way, you utilize the full power of the sub and ensure balanced sound.

4. **Improving Sound**: If you haven’t already, consider adjusting the crossover settings on your powered sub to ensure you’re getting the best low-end response without muddying the mids and highs from your speakers.

In summary, while connecting to the R LR output works, using a mono output with a Y-splitter would provide a better overall sound experience.

Feel free to ask if you need more assistance or if any other members have insights on this setup!