MB4 versus 502B

Professional Installed
1
  • I have a set of 402ii's I used a 502B sub with. I decided to try an MB4 with them. In fact two MB4's stacked. According to the data two MB4's would be similar in output to a 502B.

When setting the Panaray digital controller for the  MB4 I get way less SPL from the MB4 compaired to the 502b. I know theres 3 dB differnce in sensitivity between them but it sounds way more. I was banking on two stacked MB4's giving similar performance to a single 502B. The MB4's should go slightly lower. My thinking was two MB4's would be a little lighter to lift  than a 502B.                                                   

2

Further to my last. I'm referring to the MB4 output on the controller versus the 502B output. The 502B setting seems to give more level out than the MB4 setting.

3

I’ve since done a frequency response measurement of the output from the controller for a 502b and MB. The clue is in the name MB as it covers MB4 up to MB24. Which is a variation in sensitivity of about it 6dB. So it looks like Bose has allowed for this and the MB output is about 5 dab down compared to the 502b. I increased the amp level by the same and it sounded quite balanced.