Line Level Input (TPA3116D2 – Digital Subwoofer Amplifier)

[Keegan Neave June 26, 2019 at 6:17 pm Post count: 0]

#36096 Reply |

Hi,

I have a pair of PA speakers with a subwoofer output and I was hoping to use the <span style=”display: inline !important; float: none; background-color: #ffffff; color: #111111; font-family: ‘Amazon Ember’,Arial,sans-serif; font-size: 19px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; line-height: 1.3; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;”>TPA3116D2 </span>board with a subwoofer speaker to give me extra bottom end.  I have connected everything to test it and the speaker is very quiet from the PA, if I connect a phone to the board it is as loud as I’d expect so I assume that the board can’t handle line level inputs.

Is it possible to swap the opamps out or otherwise to modify the board to handle line level inputs please or would I need a preamp?

Thanks,
Keegan

[DrokKeymaster June 27, 2019 at 8:28 am Post count: 2971]

#36104 Reply |

Hello Keegan Neave，

Thanks for writing in.

Would you please tell us more details about your connection? What kindf of input audio it is?

Best regards.

[Keegan Neave June 28, 2019 at 7:01 pm Post count: 0]

#36121 Reply |

Sure thing, the input to the digital amplifier is coming from the subwoofer output of one of these:
<span>https://www.laney.co.uk/products/audiohub-ah4x4-active-cabinet

It also has a line out that I haven’t tried, not sure if the signal would be different but worth trying.  I have in the past plugged the subwoofer output in to a bass guitar amplifier and that worked a treat, not sure if that helps but it is at least more data :)</span>

[Keegan Neave June 29, 2019 at 3:53 pm Post count: 0]

#36124 Reply |

Tried the line out, very slightly louder but I suspect that’s because line out doesn’t have a low pass filter on it. This one has me stumped.

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