What i discovered in my LLT build - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 47 Old 04-27-07, 12:32 PM
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Re: What i discovered in my LLT build

Wow, that is a cool review. Has he reviewed other amps as well?

I got my info regarding efficiency from this thread
http://forums.audioholics.com/forums...ad.php?t=14222

I too would like to know how it is possible to pull so much power from the wall dispite the fuses. Maybe because of the 50% duty cycle the fuses never got hot enough to trip???
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post #32 of 47 Old 04-27-07, 12:36 PM
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Re: What i discovered in my LLT build

I dunno about the fuses, but acheiving the full power output at 1kHz is quite irrelevant with regards to maximum output at say, 20Hz.
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post #33 of 47 Old 04-27-07, 12:52 PM
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Re: What i discovered in my LLT build

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I dunno about the fuses, but acheiving the full power output at 1kHz is quite irrelevant with regards to maximum output at say, 20Hz.
The review found the 2500 to output 2112W bridged into 4ohms at 20hz. The sine wave shows virtually zero distrotion as well.
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post #34 of 47 Old 04-27-07, 01:38 PM
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Re: What i discovered in my LLT build

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The review found the 2500 to output 2112W bridged into 4ohms at 20hz. The sine wave shows virtually zero distrotion as well.
Right, and that proves my point. At 20Hz, the output capability had decreased by ~12%. Am I right?
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post #35 of 47 Old 04-27-07, 01:58 PM
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Re: What i discovered in my LLT build

Yes, that's normal... Bruce once expected that!! But I would appreciate that he clarifies how that is possible with a 15 A fuse...

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post #36 of 47 Old 04-28-07, 10:22 AM
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Re: What i discovered in my LLT build

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how that is possible with a 15 A fuse...
Slow blow fuse is used on the primary side. The 2500 watt rating (on the load side) is possible only short term, relying on the power supply capacitors to supply the current for those bursts.

You can't support 2500 watts for long on a 1800 watt circuit (obviously). Generally the line will sag below 120 volts when attempting to dissipate 2500 watts for long. The real source of the problem is revealed when the poster says:

However i also think one of my main problems is voltage drop as every time it hits the lamp next to me dimms a good amount. I dot have the setup very good at all with my arcam, cd player, and the EP2500 all on the same outlet..

hehe, that dimming light is telling you something. The power supply in the 2500 can supply current from its capacitor reservoir. You need to fill the well with a decent line to have a fighting chance. The problem lies in the supply side, not in the amplifier....

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post #37 of 47 Old 04-28-07, 11:09 AM
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Re: What i discovered in my LLT build

Yes Brucek, this is well understood, but this is not the fault of the amp.... This will be the same for any amp. What I am concerned about is :assuming there is no line sag, the amp can deliver 2112 W RMS into 4 ohms bridged at 20 Hz, and 2400 W at 1 KHz as per the reviw. Is this possible with a 15 A fuse?

When you say:"The 2500 watt rating (on the load side) is possible only short term, relying on the power supply capacitors to supply the current for those bursts." does it mean it is only peak power??

The review was clearly saying that it was 2112 W RMS (assuming no line sag). Pls re-check.

From the other side, pls check this AVS thread http://www.avsforum.com/avs-vb/showt...9&page=2&pp=30 where thylantyr says "there is amajor flaw in the test"!! But wouldn't say what this flaw is about unless PMed.

Any comments?

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post #38 of 47 Old 04-28-07, 12:20 PM
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Re: What i discovered in my LLT build

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Is this possible with a 15 A fuse?
Sure, for a short period. Note in the test he used a 50% duty cycle.

Quote:
does it mean it is only peak power??
Nope, RMS power, if you kept the line at 120volts and for short cycles.

Quote:
there is amajor flaw in the test
Didn't read the thread, but I'm sure the flaw is that it isn't continuous RMS power into a load over 20Hz to 20000hz........ how could it be. 1800 watts IN and 2500 watts OUT..can't be done for long.

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post #39 of 47 Old 04-28-07, 12:38 PM
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Re: What i discovered in my LLT build

I do not see where it is said 1800 Watts in?? So does this review tell us something obvious, i.e what if there was a 4000 Watts power from the wall? Would it probably achieve 2400 W continuously?

In a nutshell does this review tell us how well the EP-2500 meets its specs?

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post #40 of 47 Old 04-28-07, 01:02 PM
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Re: What i discovered in my LLT build

Quote:
I do not see where it is said 1800 Watts in??
Standard 15 amp household circuit.

120 volts x 15 amps = 1800 watts........................

Quote:
In a nutshell does this review tell us how well the EP-2500 meets its specs?
Yep, it meets its spec and is an excellent bang for the buck. Especially when we aren't that concerned about THD as in a subwoofer application. Same as the BFD...it's great for the application.

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