Harbottle Audio guarantees that the end use performance of any Harbottle product (including Ridge Audio subwoofer drivers) will perform with 1% in end use measures (output, distortion, and compression) given the following criteria are identical in all measured instances:

1. The location

2. The room layout

3. The mains power supply

4. The temperature

5. The amplification

6. The DSP programming

7. The enclosure

Testing must be performed using professional grade equipment and performed by a professional in the audio data analysis industry.

Distortion, compression, and output must measured.

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The point of this guarantee is that the audible difference between product, regardless of date of manufacture, will be nil. And by extension, we put our money where our mouth is.