Zoom using an iPhone15 -iPhone17 with USB-C adapter

If you're trying to record or Zoom meeting with a clean line-level audio into a USB-C iPhone (15–17), here's the setup Apple doesn't tell you about—but it works beautifully:

🔧 What You Need

• Mixer or Line-Out source (e.g., audio interface, soundboard or line-out from a sound system)
• 3.5mm cable (from source to where your Zoom is on your Iphone)
• Variable attenuator (e.g., Nano Patch+ or SESMKP-27)
• SR-C2003 cable (3.5mm TRRS to USB-C)
• USB-C iPhone 15–17

🚫 What to Avoid

• Apple’s USB-C to 3.5mm adapter — DAC-only, output only, no analog input support.
• Fixed attenuators like Headset Buddy — Only works with lightning connections.

✅ Why This Works

• USB-C iPhones accept analog input via TRRS when properly wired.
• SR-C2003 cable is TRRS-compatible and routes signal correctly (supports microphone or line-out type).
• Variable attenuator lets you match mixer or line-out output to iPhone input level (you control the level of attenuation).
• Apple doesn’t offer input gain control—this setup solves that.

🧠 Bonus Tip

The Nano Patch+ or the SESMKP-27 (or similar attenuators are passive, durable, and gives you smooth rotary control over your input level. 

📷 Signal Chain Diagram

source Line-out - variable attenuator - SR-C2003 adapter (line-in/microphone input) - Iphone15-17