Pass F5: Which speakers would you use? - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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
Reply
 
Thread Tools Search this Thread
Old 8th May 2015, 03:14 AM   #1
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
Default Pass F5: Which speakers would you use?

Given the choice of speakers for use w/an F5 and preamp with healthy gain which would you use/have used?

A) 2-way, 85db sensitivity, 8 ohm w/6 ohm min.

B) 2.5 way, 90-ish db, 8 ohm w/4 ohm min.

C) 3 way, 90 db-ish, 4 ohm w/3 ohm min.

I am starting to think the f5 plays nice w/a flat impedence speaker...it's not really a matter of sensitivity if you listen at sane levels (say 90db-ish). Your thoughts/experiences?
  Reply With Quote
Old 8th May 2015, 03:40 AM   #2
diyAudio Member
 
Join Date: Mar 2003
Location: midwest
Quote:
Originally Posted by Hikari1 View Post
Given the choice of speakers for use w/an F5 and preamp with healthy gain which would you use/have used?

A) 2-way, 85db sensitivity, 8 ohm w/6 ohm min.

B) 2.5 way, 90-ish db, 8 ohm w/4 ohm min.

C) 3 way, 90 db-ish, 4 ohm w/3 ohm min.

I am starting to think the f5 plays nice w/a flat impedence speaker...it's not really a matter of sensitivity if you listen at sane levels (say 90db-ish). Your thoughts/experiences?
Right now, I cant say enough good about my combo in the bedroom, where my turntable is located. The speakers fall in the 8 ohms, 6ohms minimum @ 85 dB category. I believe we are using the same pre, BA-3. With B-1 I could get sane levels, but at or near full throttle which led me to a tube pre amp which also has a requisite phono section. With the BA-3 and Pearl, it is a very nice set.

I also have a set to try that are about 91dB, 4 ohms. Also Not tried yet are some Econowaves, with wave guides and compression drivers, but they are too big to haul upstairs. I have tried the F-5 on them, as well as BA-3 with digital source and that was also nice. These are pretty much 8 ohm speakers and very efficient, at least mid 90s dB.

Last, tried with F-5 and a tube pre amp were my basement set of Altec A-7, way efficient and they also sound nice, but there is no need for the extra gain...they are over 100 dB!

A large factor is also room size. When I took the smaller 85 dB speakers down stairs, they could clip a 150 watt A/B power amp at louder than normal but not insane loud levels. In the bedroom system, the room is smaller and easier to reach satisfactory levels.

Sounds like we are on similar paths... I am finishing a BA-3 Power Amp as we speak. This should end any gain needs! Let me know what you find!

Russellc
__________________
Pass B-1 preamp, Pass F-5 Amp, Pass BA-3 Preamp, Pass BA-3 Amp, Pass Pearl 2 Phono

Last edited by Russellc; 8th May 2015 at 04:08 AM.
  Reply With Quote
Old 9th May 2015, 11:54 AM   #3
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Got Polk LSi15 very happy whit it

4 ohms nominal are not a problem whit twins on 2.6A bias and plenty loud

If one can get 7.999999 ohms and 110 dB speakers he would be Lucky Bastard

This is D I Y so get speakers U like and then make them sound better whit F5.
Plenty of scope to build as U need and can afford

F5 is plenty fast dog whit load off fight in it
  Reply With Quote
Old 9th May 2015, 12:53 PM   #4
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
mine 91.4db/W/m @16R and 94db/W/m @8R (dropping to arroundish 8R bellow 150Hz , where bass helper kicks in)

no prob with Papas Koan (F4) on first and Papa's Koan M2 on second ones
__________________
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 15th May 2015, 09:54 PM   #5
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
Well, I just picked up a pair of KEF R700s...3 way, 89db, 8 ohm/3.2R min. I didn't think the f5 would drive them well but surprise, surprise. No problem getting loud about 3/4 way up the dial. Good bass too. My F5 is biased high (1.7A) and seems to have no problem loud.

This speaker, although rated at 8 ohms, is really probably a 4 ohm speaker. I am going to look at adding more mossiest to get more juice for the 4 ohm load.
  Reply With Quote
Old 16th May 2015, 04:06 AM   #6
diyAudio Member
 
Malotron's Avatar
 
Join Date: Sep 2005
Location: Honolulu
82.1 db/W/m 15ohm X'ed above 120hz works surprisingly well. F4 too... Squishy preamps need not apply.

Could model a roller coaster on its impedance curve.
Attached Images
File Type: jpg R35FIG1.jpg (22.6 KB, 414 views)
  Reply With Quote
Old 16th May 2015, 07:03 PM   #7
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Well simply put

Papa Amp's are prety good
  Reply With Quote
Old 17th May 2015, 12:09 AM   #8
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
naah

sissy ones

__________________
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 18th May 2015, 07:19 PM   #9
Hikari1 is offline Hikari1  United States
diyAudio Member
 
Join Date: Jun 2012
Location: Seattle
After a weekend more of listening I might need a little more power. The f5 is pretty comfortable up to about 85db(not peak) but after that the soundstage collapses a bit. This is with a ba3 front end, Iam using about 75 percent of the volume knob. I havent heard any clipping yet but I dont want to.

I might go to 35v rails, dual mono. This will get me a little more power. Probably wont cascode the fets unless zen mod makes a fuss. 35V is pushing it but my jfets are 8ma and i might use little sinks on them.

Another idea is to put 2 more f5 boards in the same chassis for a total of 4 channels on one psu and then biamp the speakers.
  Reply With Quote
Old 19th May 2015, 02:34 AM   #10
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
fuss
__________________
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

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pass F5 Help Needed vdi_nenna Pass Labs 31 7th May 2015 09:37 AM
Pass F5 as a headphone amp? lorienblack Pass Labs 4 19th September 2014 05:09 PM
Pass Labs amp combination for Thiel speakers, need Mr Pass' advice ! And everyone... JulienG Pass Labs 80 14th February 2013 05:22 PM
Wattage of Pass F5 pdhanwada Pass Labs 132 28th January 2013 04:14 PM
PASS F5 with Linn Sara 86db 2.6-4 ohm speakers :) stifa Solid State 3 19th April 2011 12:03 PM


New To Site? Need Help?

All times are GMT. The time now is 06:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2