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#241722 - 01/20/09 09:18 PM Re: M80's on the way, need advice...please [Re: Wid]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
Wow Dana, I just looked up the RPA-2. Very nice!!! It's amazing to me that a power amplifer with dual high current toroidal power transformers can be sold for under $1000, and 350 watts into 4 ohms to boot.

As Will Smith said in Independence Day "I have got to get me one of these!".

Please keep us informed on any overheating issues or shutdowns with the M80's.

If you feed the M80's good stuff, the will respond in kind!

pn
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#241765 - 01/20/09 11:06 PM Re: M80's on the way, need advice...please [Re: Worfzara]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
 Originally Posted By: Worfzara
Wow Dana, I just looked up the RPA-2. Very nice!!! It's amazing to me that a power amplifer with dual high current toroidal power transformers can be sold for under $1000, and 350 watts into 4 ohms to boot.

As Will Smith said in Independence Day "I have got to get me one of these!".

Please keep us informed on any overheating issues or shutdowns with the M80's.


If you feed the M80's good stuff, the will respond in kind!

pn


Yea Wolf,

It truly is one great amp, you should check the numerous reviews. Audioholics gave it a glowing review as well as product of the year. The reviews are for the Emotiva RPA-1...The RPA-2 (the one I have) is the exact same model with some minor tweaks for stability and a new updated look, other than that, they are identical. The RPA-2 just came out this year. The blue lighted gauges on the front are sweet.

As cool to the touch as this thing has been running today, and I've been pushing it pretty hard (I'm afraid my neighbors are gonna call the cops \:\) , I would highly doubt I would have any issues with it. If I do however, I will let you all know for sure.

Take Care,

Oh, and Bob, those tracks at your site sound excellent! nice work.

Dana
_________________________
M80's, QS8's, M22's, CHT SHO-10, Dual CHT SS-18.1's, Onkyo NR3008, Mitsubishi WD-73740

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#241769 - 01/20/09 11:17 PM Re: M80's on the way, need advice...please [Re: Dduval]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Neighbors? Do what I did whenever my neighbor suggested I needed better soundproofing for my house whenever the wife and I were watching War of the Worlds a long while back. I suggested he needed ...this.


Glad to hear that you are really enjoying the new toys Dana, Congrats!
_________________________
Rick
Our Room

smile

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#241797 - 01/21/09 04:49 AM Re: M80's on the way, need advice...please [Re: RickF]
BoB/335 Offline
aficionado

Registered: 12/26/08
Posts: 505
Glad you're enjoying the amp. It always feels good when you come out at the end knowing that it was worth the extra money to really be happy. You often hear people say they wish they had gone the extra. It's very rare to hear people wish they had gone for less.

Thanks for the compliments on my band. (Now if we could just get people to committ to stay around for a while.)

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#241821 - 01/21/09 11:09 AM Re: M80's on the way, need advice...please [Re: BoB/335]
Zimm Offline
connoisseur

Registered: 12/08/08
Posts: 1361
Loc: New Orleans
 Originally Posted By: BoB/335
I believe the statement is that you need 10X the power to go twice as loud. With that in mind, many feel that smaller increases of power don't really give you much. I follow the theory that more juice is more juice.

_________________________
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire

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#241851 - 01/21/09 01:36 PM Re: M80's on the way, need advice...please [Re: Zimm]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada


 Originally Posted By: Zimm
 Originally Posted By: BoB/335
I believe the statement is that you need 10X the power to go twice as loud. With that in mind, many feel that smaller increases of power don't really give you much. I follow the theory that more juice is more juice.




Hey Bob, that statemant may sound impressive, but the math doesn't really work out.

When I use the calculator for a 100 watt amp I get 113 db at the listening position at 12 feet from the M80s. To get twice as loud, and assuming to most people an increase of 7 db (now this is the subjective part I know) you only have to go to a 500 watt amplifer to get to 120 db. Which to is 5 times the power to double the volume.

Am I missing someting?

paul
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#241855 - 01/21/09 01:57 PM Re: M80's on the way, need advice...please [Re: Worfzara]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3270
Loc: Laval, Quebec, Canada
This is the first time I see 7db used for "twice as loud". Just did a quick check and both references I found were 10db. Where did you fall upon 7db?
_________________________
E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
Audiobytes! 2M22! 2VP150!

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#241859 - 01/21/09 02:19 PM Re: M80's on the way, need advice...please [Re: EFalardeau]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
http://www.axiomaudio.com/dynamicheadroom.html

Top of the 4th paragraph.

In this artical Alan Loft states "Recall that 1 decibel (dB) represents the smallest detectable change in loudness, and that we subjectively perceive a 6-to-10-dB increase in loudness as sounding "twice as loud.""

For some reason 7db was stuck in my head. I probably should have used 8db as an average. This gives us 600 watts at 121 db. So it's 6 times the power for twice as loud. I did say this was very subjective.

paul
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

Top
#241867 - 01/21/09 03:03 PM Re: M80's on the way, need advice...please [Re: Zimm]
Zimm Offline
connoisseur

Registered: 12/08/08
Posts: 1361
Loc: New Orleans
 Originally Posted By: Zimm
 Originally Posted By: BoB/335
I believe the statement is that you need 10X the power to go twice as loud. With that in mind, many feel that smaller increases of power don't really give you much. I follow the theory that more juice is more juice.


My earlier post lost the insight I added:
The thing most people don't think of when talking about doubling the volume is that dbs are not a linear scale. 75 is not very loud, double that and you have no more hearing. Adding 10 db is a huge increase - do 90 to 100 at home see the difference. That is why I think more power adds more sound than straight math implies – you don’t need to up the db scale much to notice a difference – about 1db as the above article mentions. Perhaps that external amp adds 50 clean watts over a clean 100 watt AVR. That might mean getting a clean 105 db instead of a clean 99 db. You will notice that, and so will your neighbors. (Now correct me based on the math…I love that part.)
_________________________
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire

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#241877 - 01/21/09 04:07 PM Re: M80's on the way, need advice...please [Re: Zimm]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
That is true Zimm. 105 db for a sustained period of time will be painfully loud for most people. Anyting over 93 db is getting just too loud for me for long periods of time. And my wife doesn't like it above 85 db (unless it's Bon Jovi, LOL).
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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