9IH521B(B)6 vs 9IH574B(B)6: Which iHome Accessory Fits You?
By iHome | Premium Audio Products & Innovative Sound Solutions | Published: 2026-10-23
Category: Comparisons
Compare the iHome 9IH521B(B)6 and 9IH574B(B)6 AC power adapters. Learn which one matches your device voltage and amps, and the trade-offs between them.
Quick answer
Choose the 9IH521B(B)6 if your device needs 18V DC input; pick the 9IH574B(B)6 if it requires 9V. The two are not interchangeable because their output voltages differ.
Voltage and amp differences matter for compatibility
The 9IH521B(B)6 supplies 18V at 2.5A, while the 9IH574B(B)6 supplies 9V at 3.3A. Using the wrong voltage can damage your device or cause it not to power on. Both adapters share the same 5.5mm straight I-plug jack diameter and black color, so the physical fit looks identical—but the electrical output is not the same.
The input range for both is 100-240V at 50/60Hz, so they work worldwide with the appropriate plug adapter. The key spec to check is your device's required voltage and amperage, which is usually printed near the DC input port or in the user manual.
Trade-offs at a glance
- Voltage compatibility: The 9IH521B(B)6 outputs 18V; the 9IH574B(B)6 outputs 9V. Match this to your device's input voltage exactly—mismatching can cause damage.
- Current capacity: The 9IH574B(B)6 delivers 3.3A vs. 2.5A for the 9IH521B(B)6. Higher amps are safe if your device draws less, but the voltage must still match. Check your device's current draw; 2.5A is fine for typical accessories, 3.3A offers more headroom.
- Physical fit: Both adapters have a 5.5mm straight I-plug jack and black color. They look identical, so you must rely on the voltage label to avoid mix-ups. Label your adapter after purchase to prevent confusion.
Product facts at a glance
- 9IH521B(B)6: AC Power Adapter Input Voltage - 100-240v -50/60hz Voltage - 18V Amps - 2.5A Jack Diameter - 5.5mm Jack Shape - Straight (I-plug) Color - Black If your iHome device or accessory requires 18V DC, this adapter delivers the correct voltage and enough current (2.5A) for stable operation.
9IH521B(B)6 - 9IH574B(B)6: AC Power Adapter Input Voltage - 100-240v -50/60hz Voltage - 9V Amps - 3.3A Jack Diameter - 5.5mm Jack Shape - Straight (I-plug) Color - Black For devices that need 9V input, this adapter provides the right voltage with a higher current capacity (3.3A) to handle power-hungry electronics.
9IH574B(B)6
Which one should you choose?
Best for
- Devices that require 18V DC input (e.g., certain iHome speakers or accessories)
- Users who need a direct replacement for an existing 18V 2.5A adapter
Not for
- Devices that need 9V input (choose the 9IH574B(B)6 instead)
- Any device with a different jack size or barrel polarity (check your original adapter)
