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Old 10th February 2014, 07:49 PM   #13761
pvg320 is offline pvg320  United States
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No experience with NCore or the newer class D stuff.

My F5 replaced a DTA-100a (I paid ~$69 for) used as a placeholder amp while I built the F5. The 5687 Aikido into the cheap DTA sounded nice and musical, and better than my old NAD integrated, especially on voices and voice harmonies, but the F5 absolutely smokes it.

The first difference, among many, that I noticed once the F5 was warmed up was how the F5 handles multi-layered passages. I heard lots of new things on recordings I thought I was very familiar with. Soundstage depth, room reverb and note decay also stand out on good recordings, but I'm certain that's a Class A thing that I had just never experienced before.

The class D (or Tripath?) of the DTA couldn't reveal all of the layers at once, and got mushy pretty quickly. It's been assigned to drive my garage system now.

F5 = mind, blown, for this guy.
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Old 10th February 2014, 07:57 PM   #13762
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i have F5 and a Hypex UcD400HG. the Hypex is of course much more powerfull. but thats it. its not even close to the F5's performance in any other way.
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Old 10th February 2014, 09:11 PM   #13763
crcook is offline crcook  United States
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Default Pass vs Class D

I built a class d amp for my son for xmas. It uses a generic (NXP??) board bought on eBay for US$25. The aluminum case cost twice that! Added a big surplus brick power supply.

It sounded very good. I didn't have the 10p speakers done, but it stood up OK to the Pass on my old JBLs. I prefer the F5, but like everything else audio, personal tastes win the day.

I have built a couple of class d amps from kits (41Hz) and from completed boards off of eBay. I don't think the 'tweaky' ones are worth the money, but I am sure there are a lot of opinions on these boards. The good news is that they are cheap and fun to experiment with. Not like playing around with tube amps or big FET amps.
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Old 10th February 2014, 10:12 PM   #13764
labjr is offline labjr  United States
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The NCore NC400 amps were trendy for a couple years. People rave about things that are new. After a while realitry sets in. How do they really sound?

I've noticed that many people make remarks about how much power you get for the money. To me that says it influences their perception of how it's going to sound. They want to like because it seems like a good value. Doesn't have to be great just not noticeably bad to get a thumbs up.
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Old 10th February 2014, 11:01 PM   #13765
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that seems to be a lame excuse. they would have gotten 5X the power for less money with the UcD series

Last edited by AudioSan; 10th February 2014 at 11:04 PM.
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Old 10th February 2014, 11:09 PM   #13766
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I'm surprised you prefer the F5 to the Aleph. I have both an F5 and an Aleph 4 and when running into B&W 683's the Aleph wins hands down, the F5 is lifeless in comparison.
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Old 10th February 2014, 11:12 PM   #13767
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so you'r surprised that we have 2 different set up's and different taste?
not to mention that our F5's is 2 completely different amps. and so are the Aleph's.
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Old 17th February 2014, 12:12 PM   #13768
Mallard is offline Mallard  Germany
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Default F5 + loudspeaker impedance

Whout do you think about to connect a 14 Ohm impedance speaker to the normal F5? Increasing speaker impedance on the F5 means less power problems? Due to the push pull configuration?

Sorry, this is maybe a stupid question for the experts but I need some clarification on that... I don't have alle the formulas to calculate the output power for all different kind of amplifiers.

Thanks and Regards,
Mallard
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Old 17th February 2014, 12:29 PM   #13769
Zen Mod is offline Zen Mod  Serbia
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almost half , comparing to 8R
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Old 17th February 2014, 01:16 PM   #13770
udailey is offline udailey  United States
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Output voltage over DC speaker resistance will give you a general idea of the output current. Then multiply that by the output voltage again and youve got the output watts. Actual operation will be different because output is AC and the speakers resistance/impedance to different frequencies varies byt the calculation above will give you a good idea of possible output power into your speaker. Max output voltage depends on psu rail voltage. Actual output voltage depends on input voltage times amplifier gain limited by rail voltage.
Since F5 is running class A the power it draws from the psu is hugely different from what it dumps into the speaker. If you read Nelsons pdf on F5 it describes how to calculate this and he makes it easy to understand.
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Last edited by udailey; 17th February 2014 at 01:19 PM.
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