System going out the window

[Boulderguy 10+ year member]

Sort of an introduction (to me) & sort of a farewell (to my existing system).

'05 Subaru Outback wagon with the following (am I posting this in the right place?):

Ipod as HU w/inline volume control

AudioControl Three.1 (as pre-amp, kinda)

2-Soundstream Reference 5.0 (old class A's)

Soundstream Ref 10.0

Focal K2P 6.5's front doors

MB Quart Premium 6.5's rear doors

JL 10w3v2 in FG box

I'm replacing the amps with all class-D stuff next week, rebuilding the amp rack, changing the sub, maybe doing some kind of custom fr door work for better angles on the speakers/less beaming. We'll see about that part, never done that.

Current & farewell system. Anyone wanna buy some amps?

That shot shows a different sub amp, another older SS Rubi.

Click to read more...

 

[billabongcr 5,000+ posts]

power rating?

 

[Rich B 5,000+ posts]

You may come to regret getting rid of those Class A amps and going to Class D.

 

[NoLimit 10+ year member]

Welcome. I was born in Boulder //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Trey803 5,000+ posts]

Yea keep the class a/b for your mids and highs.......only use class d for subs

 

[Boulderguy 10+ year member]

Power rating? Don't really know. Technically it's 12.5x4 and 50x1 (cheater amps).

Going by fuse ratings it's 160a @ 14.4v * .6 efficiency = about 1300w.

Feels like 100x2 fr, 40x2 rr, 900 sub with current gain settings.

And yeah, I may regret making the switch away from class A for the fronts. We'll see. The sub amp needs the efficiency tho. I'm kinda of the mindset lately that power is pretty much power. The idea behind the new full-range class D amps (eclipse XA4000) is pretty interesting.

 

[Trey803 5,000+ posts]

Yes but class d amp do have more distortion than class a/b

 

[Team Hammer 10+ year member]

Actaully A/B has more distortion.

Your dealing with a Push Pull amp. You get some distortion called Bia's Current. Though most high end units have filters for this, Its still there. Not to mention highier heat levels.

 

[Boulderguy 10+ year member]

dbl post...oops.

 

[Boulderguy 10+ year member]

^^ yeah, what he said.

The new Eclipse amps are a whole different burrito than traditional D class stuff -

ECLIPSE’s latest power amplifiers feature new ICEpower

technology. Seeing increasing use even in ultra high-end audiophile equipment, ICEpower

advantages include superior audio quality, compactness and reduced energy demand as well as reliability. Employing ICEpower

analog technology in ECLIPSE power amplifiers enable them to deliver stunning results in terms of linearity and reduced THD, increased dynamic range and high power stage efficiency.

In an ICEpower

analog circuit the analog signal is modulated into a PWM (Pulse Width Modulation) signal with the Controlled Oscillation Modulator (COM). Then after the power stage, this PWM signal feeds back into the Multivariable Enhanced Cascade Control (MECC) where it is compared to the original input signal and any differences are compensated for to eliminate power stage-induced distortion. The post output filter analog signal also feeds back into the MECC that compensates for output filter load dependent characteristics. The end result is superb sound quality free from conventional Class D limitations.

Alpine's using it now, so's Xtant. I'm trying to get in early so I can say "told you so" & be self-righteous. Course, it may backfire, in which case I'll never admit it.

Either way, distortion is one of my least important considerations when choosing an amp. I think you may be thinking of the restrictions of traditional sub amps, I.E. - there's a reason they're only for subs!

 

[squeak9798 5,000+ posts]

Yea keep the class a/b for your mids and highs.......only use class d for subs

20yrs ago that may have been true.

With the quality design and build of many full range class D amps within recent years.....you won't hear an audible difference between them and a quality A/B.

 

[Team Hammer 10+ year member]

^^ yeah, what he said.
The new Eclipse amps are a whole different burrito than traditional D class stuff -

ECLIPSE’s latest power amplifiers feature new ICEpower

technology. Seeing increasing use even in ultra high-end audiophile equipment, ICEpower

advantages include superior audio quality, compactness and reduced energy demand as well as reliability. Employing ICEpower

analog technology in ECLIPSE power amplifiers enable them to deliver stunning results in terms of linearity and reduced THD, increased dynamic range and high power stage efficiency.

In an ICEpower

analog circuit the analog signal is modulated into a PWM (Pulse Width Modulation) signal with the Controlled Oscillation Modulator (COM). Then after the power stage, this PWM signal feeds back into the Multivariable Enhanced Cascade Control (MECC) where it is compared to the original input signal and any differences are compensated for to eliminate power stage-induced distortion. The post output filter analog signal also feeds back into the MECC that compensates for output filter load dependent characteristics. The end result is superb sound quality free from conventional Class D limitations.

Alpine's using it now, so's Xtant. I'm trying to get in early so I can say "told you so" & be self-righteous. Course, it may backfire, in which case I'll never admit it.

Either way, distortion is one of my least important considerations when choosing an amp. I think you may be thinking of the restrictions of traditional sub amps, I.E. - there's a reason they're only for subs!

One advantage to D Amps is Small Foot print and heat. They are either on or Off and use PWM.

I heard a PDX 150-4 in a truck and it sounded great. I might get one one of these Next time.

Now if I could remebember How to find the area under the curve, I could figure out what those engineers mean

 

[Boulderguy 10+ year member]

I like that Alpine for it's size, much pricier than the Eclipse tho.

Get this - the Alpine states RMS 150x4, the Eclipse 125x4. But the Eclipse is fused for 30a more. I'm betting on the Eclipse.

 

[squeak9798 5,000+ posts]

I like that Alpine for it's size, much pricier than the Eclipse tho.
Get this - the Alpine states RMS 150x4, the Eclipse 125x4. But the Eclipse is fused for 30a more. I'm betting on the Eclipse.

Fuse size is relatively meaningless.

CA&E measured the Alpine 4.150 at outputting 986w RMS. That's almost 250w per channel.

So it's no slouch //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Boulderguy 10+ year member]

I can't agree about the fuse size thing, but regardless those are **** impressive numbers for the Alpine!