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SUPPORT FORUMS FOR DECWARE SPEAKER PLANS >> DECWARE Imperial support forum >> Sensitivity of the Imperial?
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Message started by morpheous85 on 04/29/06 at 07:37:18

Title: Sensitivity of the Imperial?
Post by morpheous85 on 04/29/06 at 07:37:18

What kind of SPL are you getting out of one? I realize it depends on the speakers used, but can anyone say that it adds _db to the speaker used?

Like a 90db driver gets you 103db or 13db gain for example?

Jason

Title: Re: Sensitivity of the Imperial?
Post by bassboy on 05/01/06 at 17:18:40

Since no one wants to touch this question, I'll offer what I know, even though I have no equipment to measure.

The sensitivity boost is a LOT. Enough that it should not be any concern.

At this point I am much more concerned with frequency response, and low frequency extension in particular. I would like 20 hz flat, or even a few db above 80. That is why I am considering the 1952 Jensen Transflex.

The imperials just won't do that. The SO reportedly will, but the measurements, I believe, were done with 2, mouth to mouth, in a room that is at least partially treated for bass response. Coincidentally, I believe this same setup measured flat to 22 hz with the original imperial pair, but I have had no such luck with mine so far.

So to answer your question, unless you are using them for pa, they will be much louder than you need so sensitivity is not really an issue.

Title: Re: Sensitivity of the Imperial?
Post by serenechaos on 05/01/06 at 21:13:21

Sensitivity @ what frequency?
Don’t BLHs just compensate somewhat for the rising response?
So a 90db driver is still 90db, but the lows are reinforced (raised), so the curve is flatter.
Robert :)

Title: Re: Sensitivity of the Imperial?
Post by bassboy on 05/02/06 at 02:17:54

I forgot to mention my experience with imperials is only up to 80 hz.

Title: Re: Sensitivity of the Imperial?
Post by jj420 on 05/02/06 at 22:36:30

a most generic question, for a most generic answer...

the horn adds around 10db 1W/!m to the sensitivity of the driver inside the tuning range of the horn.

its not exact, but thats about what it is, besides which, Steve D reports that often they didnt even need to be hooked up to augment the bass of anything playing in the room. so its gotta be plenty.