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-   -   Anyone have measured HI-VI D5.8? (http://www.diyaudio.com/forums/multi-way/132474-anyone-have-measured-hi-vi-d5-8-a.html)

inertial 3rd November 2008 01:49 PM

Anyone have measured HI-VI D5.8?
 
Hi,

I am interested also in this 5 1/2", looks attractive for Xmax and power handling but they claim 83dB and I have fear maybe real will be 81dB only!!
Does someone has measured a frequency response? :cannotbe:

Many thanks,

Paolo

inertial 4th November 2008 09:18 AM

No one have purchased this driver? How is it?

When I read the Zaph test of his brother, D6.8, I have seen very low efficency, almost 2 dB less than Hi-Vi claims. This is my fear, D5.8 is declared 2 dB less than D6.8 ..... so 2+2 =4 84dB - 4 = 80dB :dead:
Can you help my with this doubt?

Cheers,
Paolo

cotdt 4th November 2008 09:41 AM

you can calculate the efficiency of the driver via the T-S parameters.

inertial 4th November 2008 09:44 AM

Thanks cotdt,


Right, but IMO it is not so precise......and the T/S parameters Zaph have measured ALSO was different from claimed, very high mass if I remember well :bawling:

Paolo

cotdt 4th November 2008 09:48 AM

Quote:

Originally posted by inertial
Thanks cotdt,


Right, but IMO it is not so precise......and the T/S parameters Zaph have measured ALSO was different from claimed, very high mass if I remember well :bawling:

Paolo

Efficiency is itself an approximation anyway. The T-S parameters will give you the relative efficiency at least, compared to the efficiency calculated from the T-S parameters of a driver of known efficiency.

inertial 4th November 2008 09:52 AM

Right, I must try :)

Paolo

inertial 4th November 2008 10:50 AM

If my math is correct I have obtained

0,26% with 2,83volt :dead:

How muthc dB spl is, do not have formula on my hand :cannotbe:

Cheers,
Paolo

cotdt 4th November 2008 11:05 AM

It should be around the same efficiency as the D6.8, about 83dB 1W/1m

inertial 4th November 2008 11:15 AM

Oh, thanks

Not so bad it seems. Very strange they claim 2 db less for the D5.8 respect to the D6.8. :xeye:
If it would be really 83dB it is ok for my target :devilr:

Cheers,
Paolo


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