High power HUs

navin · 27th June 2006, 10:52

http://www2.panasonic.com/webapp/wcs...s&displayTab=S

the above link got me thinking. Now those who know me know that this is not something I oft do.

30W rms (ok it is at 1% distortion) is not bad for a HU. Anyone know of a HU that puts out more?

jkdas · 27th June 2006, 11:40

Ah, look at these of the same product
Pre-Amp Outputs (Front/Rear/Subwoofer)

:dual outputs (5V/60 ohms)

Subwoofer Output Level/Impedance

5V/60 ohms !

why 60 ohms! And a snr of 100 above is excellent right?

navin · 28th June 2006, 12:28

Quote:

Originally Posted by jkdas

Ah, look at these of the same product
Pre-Amp Outputs (Front/Rear/Subwoofer)

:dual outputs (5V/60 ohms)

Subwoofer Output Level/Impedance

5V/60 ohms !

why 60 ohms! And a snr of 100 above is excellent right?

60 ohms is an odd impedance. Usually you'd look at 10-20k ro so as most amps have an input impedance in that range.

Rehaan · 28th June 2006, 13:01

So how does that work Navin?

Wouldn't it be getting VERY hot, or is it using a different kind of amplification?

cya
R

Sam Kapasi · 28th June 2006, 18:52

No No Rehaan,

JKD has pointed out the PRE-amplifier output in peak to peak voltage. No pre amp components produces heat (rather needs to)
Don't confuse the Power output (measured in WATTS) with the pre amplifier output (Measured in AC VOLTS peak to peak)

It's odd for a company to state the Pre Amp output @60 ohms.
Generally the input impedance for most amplifiers is about/around 20000 ohms. So for example is you connected two amplifiers on the same set of RCA outs you would effectively have an input impedance of about 10000 ohms.
It would be near impossible to find any electronic device (eq, DSP, amp, processor etc) that had an input impedance of 60 ohms.
That's why Navin found it strange.

Rehaan · 28th June 2006, 19:42

Hey Sam,

My question didnt arise after looking at the preamp outputs, but the 30W RMS that is mentioned ... ?

cya
R

jkdas · 28th June 2006, 21:17

Quote:

Originally Posted by Rehaan

Hey Sam,

My question didnt arise after looking at the preamp outputs, but the 30W RMS that is mentioned ... ?

cya
R

I found teh answer

Class T amp! like in my PA275! yahooo. Its comming back in HU.

Sam Kapasi · 28th June 2006, 23:11

Sory Rehaan, I thought you were referring to JKs post. I am old and senile too.

navin · 29th June 2006, 12:48

Sam, remember I got 10+ years on you and I could assume a lot more chemicals in my system (coming as I did at the fag end of the "Love Generation"). Now imagine my state of mind. No you dont need to imagine - it is evident in the quality of my posts on this forum. Thanks to guys you others can gleam something useful from my rantings.

I dont think the Panny HU is Class D. I too wonder about the heat issue and that is why I have been loathe to recommend such HUs. Still this is a topic that must be investigagted before we discard such products as hocus pocus.

jkdas · 29th June 2006, 13:35

Quote:

Originally Posted by navin

Sam, remember I got 10+ years on you and I could assume a lot more chemicals in my system (coming as I did at the fag end of the "Love Generation"). Now imagine my state of mind. No you dont need to imagine - it is evident in the quality of my posts on this forum. Thanks to guys you others can gleam something useful from my rantings.

I dont think the Panny HU is Class D. I too wonder about the heat issue and that is why I have been loathe to recommend such HUs. Still this is a topic that must be investigagted before we discard such products as hocus pocus.

It is actually Class T not D. I googled and found it so in many sites

http://www.crutchfield.com/S-cZYnshC...300&I=133C8803

navin · 29th June 2006, 17:17

Quote:

Originally Posted by jkdas

It is actually Class T not D. I googled and found it so in many sites

http://www.crutchfield.com/S-cZYnshC...300&I=133C8803

Anyone got any opinons on how it sounds?

santosh.s · 6th July 2007, 09:10

Just revisited the crutchfield link now, it has earned very good feedback over time (4.5 stars out of 5 from 23 people!)

navin · 6th July 2007, 11:15

santosh. I dont read ragazine feedback. i trust you also rely on your own ears. ragazines have other priorites incl the "Audiophile" ones.

low_bass_makker · 6th July 2007, 12:28

but the features looks good for the HU. and the internal amp is said to be 31 watts RMS but with what other figures are not mentioned.

santosh.s · 6th July 2007, 12:58

Quote:

Originally Posted by navin

santosh. I dont read ragazine feedback. i trust you also rely on your own ears. ragazines have other priorites incl the "Audiophile" ones.

I think you meant "magazines"? that is true, it is hard to believe them due to their vested interests. But the link points to a net shopping site, and I respect user feedbacks, especially if it is a collective opinion from a lot of people over a period of time and unless there is something apparently fishy (one has to filter out overly positive comments out of excitement or sarcastic comments out of frustration

)

27th June 2006, 10:52	#1
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,199 Thanked: 9,304 Times	High power HUs http://www2.panasonic.com/webapp/wcs...s&displayTab=S the above link got me thinking. Now those who know me know that this is not something I oft do. 30W rms (ok it is at 1% distortion) is not bad for a HU. Anyone know of a HU that puts out more?
	() Thanks

27th June 2006, 11:40	#2
jkdas Senior - BHPian Join Date: Sep 2005 Location: Thiruvananthapu Posts: 9,687 Thanked: 1,492 Times View My Garage	Ah, look at these of the same product Pre-Amp Outputs (Front/Rear/Subwoofer) :dual outputs (5V/60 ohms) Subwoofer Output Level/Impedance 5V/60 ohms ! why 60 ohms! And a snr of 100 above is excellent right?
	() Thanks

28th June 2006, 13:01	#4
Rehaan Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 24,046 Thanked: 34,078 Times	So how does that work Navin? Wouldn't it be getting VERY hot, or is it using a different kind of amplification? cya R
	() Thanks

28th June 2006, 18:52	#5
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,997 Thanked: 2,378 Times View My Garage	No No Rehaan, JKD has pointed out the PRE-amplifier output in peak to peak voltage. No pre amp components produces heat (rather needs to) Don't confuse the Power output (measured in WATTS) with the pre amplifier output (Measured in AC VOLTS peak to peak) It's odd for a company to state the Pre Amp output @60 ohms. Generally the input impedance for most amplifiers is about/around 20000 ohms. So for example is you connected two amplifiers on the same set of RCA outs you would effectively have an input impedance of about 10000 ohms. It would be near impossible to find any electronic device (eq, DSP, amp, processor etc) that had an input impedance of 60 ohms. That's why Navin found it strange.
	() Thanks

28th June 2006, 19:42	#6
Rehaan Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 24,046 Thanked: 34,078 Times	Hey Sam, My question didnt arise after looking at the preamp outputs, but the 30W RMS that is mentioned ... ? cya R
	() Thanks

28th June 2006, 23:11	#8
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,997 Thanked: 2,378 Times View My Garage	Sory Rehaan, I thought you were referring to JKs post. I am old and senile too.
	() Thanks

29th June 2006, 12:48	#9
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,199 Thanked: 9,304 Times	Sam, remember I got 10+ years on you and I could assume a lot more chemicals in my system (coming as I did at the fag end of the "Love Generation"). Now imagine my state of mind. No you dont need to imagine - it is evident in the quality of my posts on this forum. Thanks to guys you others can gleam something useful from my rantings. I dont think the Panny HU is Class D. I too wonder about the heat issue and that is why I have been loathe to recommend such HUs. Still this is a topic that must be investigagted before we discard such products as hocus pocus. Last edited by navin : 29th June 2006 at 12:49.
	() Thanks

6th July 2007, 09:10	#12
santosh.s Senior - BHPian Join Date: Aug 2005 Location: Bangalore Posts: 1,077 Thanked: 70 Times View My Garage	Just revisited the crutchfield link now, it has earned very good feedback over time (4.5 stars out of 5 from 23 people!)
	() Thanks

6th July 2007, 11:15	#13
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,199 Thanked: 9,304 Times	santosh. I dont read ragazine feedback. i trust you also rely on your own ears. ragazines have other priorites incl the "Audiophile" ones.
	() Thanks

6th July 2007, 12:28	#14
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,815 Thanked: 305 Times View My Garage	but the features looks good for the HU. and the internal amp is said to be 31 watts RMS but with what other figures are not mentioned.
	() Thanks