Anyone have measured HI-VI D5.8?

inertial · 3rd November 2008, 01:49 PM

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?

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

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

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

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

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

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.

If it would be really 83dB it is ok for my target

Cheers,
Paolo

3rd November 2008, 01:49 PM	#1
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	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? Many thanks, Paolo

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4th November 2008, 09:18 AM	#2
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	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 Can you help my with this doubt? Cheers, Paolo

4th November 2008, 09:41 AM	#3
cotdt diyAudio Member Join Date: Oct 2005	you can calculate the efficiency of the driver via the T-S parameters.

4th November 2008, 09:44 AM	#4
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	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 Paolo

4th November 2008, 09:52 AM	#6
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	Right, I must try Paolo

4th November 2008, 10:50 AM	#7
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	If my math is correct I have obtained 0,26% with 2,83volt How muthc dB spl is, do not have formula on my hand Cheers, Paolo

4th November 2008, 11:05 AM	#8
cotdt diyAudio Member Join Date: Oct 2005	It should be around the same efficiency as the D6.8, about 83dB 1W/1m

4th November 2008, 11:15 AM	#9
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	Oh, thanks Not so bad it seems. Very strange they claim 2 db less for the D5.8 respect to the D6.8. If it would be really 83dB it is ok for my target Cheers, Paolo

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