Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

F5 power amplifier
F5 power amplifier
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 10th February 2014, 06:49 PM   #13761
pvg320 is offline pvg320  United States
diyAudio Member
pvg320's Avatar
Join Date: Feb 2013
Location: Olathe, Kansas
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.
  Reply With Quote
Old 10th February 2014, 06:57 PM   #13762
AudioSan is offline AudioSan  Norway
diyAudio Member
Join Date: Feb 2009
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.
  Reply With Quote
Old 10th February 2014, 08:11 PM   #13763
crcook is offline crcook  United States
diyAudio Member
Join Date: Mar 2009
Location: Silicon Valley, California, USA
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.
  Reply With Quote
Old 10th February 2014, 09:12 PM   #13764
labjr is offline labjr  United States
diyAudio Member
Join Date: Apr 2003
Location: MA
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.
  Reply With Quote
Old 10th February 2014, 10:01 PM   #13765
AudioSan is offline AudioSan  Norway
diyAudio Member
Join Date: Feb 2009
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 10:04 PM.
  Reply With Quote
Old 10th February 2014, 10:09 PM   #13766
KatieandDad is offline KatieandDad  United Kingdom
diyAudio Member
KatieandDad's Avatar
Join Date: Nov 2011
Location: UK
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.
  Reply With Quote
Old 10th February 2014, 10:12 PM   #13767
AudioSan is offline AudioSan  Norway
diyAudio Member
Join Date: Feb 2009
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.
  Reply With Quote
Old 17th February 2014, 11:12 AM   #13768
Mallard is offline Mallard  Germany
diyAudio Member
Join Date: Jan 2003
Location: Germany, Luenen
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,
  Reply With Quote
Old 17th February 2014, 11:29 AM   #13769
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
Zen Mod's Avatar
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
F5 power amplifier
almost half , comparing to 8R
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 17th February 2014, 12:16 PM   #13770
udailey is offline udailey  United States
Passive Aggressive
diyAudio Member
Join Date: Mar 2008
F5 power amplifier
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.
purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com

Last edited by udailey; 17th February 2014 at 12:19 PM.
  Reply With Quote


F5 power amplifierHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 10:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 05:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 10:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 08:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 04:06 PM

New To Site? Need Help?

All times are GMT. The time now is 02:25 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio