Help needed understanding the db numbers regarding gain

The hows and whys of running sound.
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Grant Bunter
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Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
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Re: Help needed understanding the db numbers regarding gain

#16 Post by Grant Bunter »

Dan56 wrote: Music director, lead guitar, soundman, tech guy. But, I don't sing so at least I don't have to be worried about that. Our new drummer is great. Tempo is right on. It is so relaxing.
Mmm and sometime soon PA owner :)

I forgot the whole reason you turned up here was because of losing your drummer.
Great to hear that's turned out well.
And the same can be said about the keyboard "issue"...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...

Dan56
Posts: 164
Joined: Tue Feb 11, 2014 10:44 pm

Re: Help needed understanding the db numbers regarding gain

#17 Post by Dan56 »

Just one last update on this issue regarding gain and a Yamaha MM8. I still did not have enough gain at the prior gig, though I thought we did have enough having made a few setting changes on the MM8. That's what I get for setting it at practice with the PA speakers facing us. :wall:
Marcel, the keyboard player was getting really frustrated with me think he should go back to bringing his Roland Amp.

At last night's gig I changed the DI box used for this key board to an active instead of the passive DI. That fixed it. I only need the gain to 12 o'clock to have enough room. Before I was running it at 4 o'clock or so.

I don't know what it is about this Yamaha board that the passive Radial Pro D2 wasn't cutting it, but the active Behringer D100 was just fine.

byacey
Posts: 947
Joined: Thu Jun 14, 2012 9:09 am
Location: Edmonton, Alberta, Canada

Re: Help needed understanding the db numbers regarding gain

#18 Post by byacey »

Passive DI's usually have a loss of anywhere from 15 to 40 db due to the turns ratio of the transformer needed for impedance matching. Active DI's can use a lower ratio transformer incurring less loss; generally in the -10 db range.
Built
T48s
WH8s
SX212

Dan56
Posts: 164
Joined: Tue Feb 11, 2014 10:44 pm

Re: Help needed understanding the db numbers regarding gain

#19 Post by Dan56 »

byacey wrote:Passive DI's usually have a loss of anywhere from 15 to 40 db due to the turns ratio of the transformer needed for impedance matching. Active DI's can use a lower ratio transformer incurring less loss; generally in the -10 db range.
Well that explains it. Though it is interesting that the passive Pro D2 works with no issues on his Hammond SK1. I have used the D100 on it before I got the D2. I was hoping to make setup easier, 1 small stereo box. Oh well.

Thanks for the explanation.

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