What is the analyzer telling you?

What is the analyzer telling you?

Many of the bad optimization decisions I have seen were made because folks didn’t correctly understand what the analyzer was telling them. Here we have a collection of data from Smaart along with context for each one. Your mission, should you choose to accept it, is to figure out what the analyzer data is indicating, and what you should do in each situation.

 

1 – System DSP Bench Test

Here’s a brand new, out of the box system processor being bench tested before an install. The unit has been freshly factory reset. What’s the problem?

2 – “Did No One Check This First?”

This is a loudspeaker processor, factory reset and in bypass. What’s the problem?

3 – Rehearsal Space PA

We are measuring variance over the space in a rehearsal room with a flown PA by taking measurements from multiple mic positions. The second measurement (teal) yields a crazy phase response. What is going on?

4 – Gradient Sub Array Alignment

We are aligning an inline gradient sub array (using delay and polarity inversion to cancel the rear-going radiation). Since this array is tuned from the rear, we place our mic behind and measure the response of each subwoofer before any DSP.

Which trace is the front sub? Which one is the rear sub? How much delay do we need, and on which?

That’s perfect to align the arrivals:

 

Add a polarity inversion and we’re set. Note how phase is now offset 180° at all frequencies:

5 – Corporate Event Quick Tuning

We’ve been given only a few minutes to rough in a quick tuning before a corporate event. We stick our mic out in the room and take a measurement. The curve looks reasonable for a speech system, but we should probably EQ out that 900 Hz bump. Good idea or bad idea?

Leave a Reply

Your email address will not be published. Required fields are marked *