New 48" ML-TL Review - Page 4 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 20th February 2005, 01:43 AM   #31
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Bricolo
ok but you clearly hear your amp clip, at the volume you'd like to have
No at volumes i rarely like to have it at...

But a bit more power would be nice for those occasions... more amps on the way...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 20th February 2005, 01:52 AM   #32
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
more amps... biamping or replacing the amps?


btw, good night everyone. It's 4 AM here
__________________
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
  Reply With Quote
Old 20th February 2005, 02:17 AM   #33
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Bricolo
more amps... biamping or replacing the amps?
both... musical amps... musical speakers.. ring around the rosy

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 21st February 2005, 09:12 PM   #34
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Default volume / power ????

During a recent session at a top secret testing laboratory, attended by Dave D, myself, and several others, comfortable volume levels were measured at the listening position ( approx 3 meters from plane of the speakers)

Drivers were Fostex FE108E Sigmas in Buschhorn MkII enclosures, installed diagonally across a room corner, about 300cm from back wall.
Best guess to net efficiency of the speaker is about 93dB - hard to quantify exactly with a BLH, which like any multi pole radiation pattern derive a significant portion of the total energy at the listening position from boundary reinforcement.


Anyways, quite comfortable listening levels were averaging between 76-82dB ( C weighted)

How much power does that mean I'm using? I don't think at any point in the afternoon did we notice serious clipping issues with 2watts of EL84 triode monoblock power. Theory and the real world are very different places.
  Reply With Quote
Old 21st February 2005, 11:10 PM   #35
diyAudio Member
 
purplepeople's Avatar
 
Join Date: Mar 2003
Location: London, Ontario, Canada
The loss at 3m will be about 15dB so the speakers were getting right around 97dB. If you weren't clipping, you must have been pretty close as that's right around 2W at the speaker.

:)ensen.
__________________
Those who claim to be making history are often the same ones repeating it.
  Reply With Quote
Old 22nd February 2005, 02:35 AM   #36
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Default here's the thing

Purple:

I don't have a VOM accurate enough to measure the applied AC to the driver terminals, nor a 'scope to observe the clipped waveforms of test signals, so these observations are about as meatball as you can get:

signal source:
FM interstation noise

1 meter on axis of (single) driver (FE108E Sigma) 70db.

Listening position (actually 2.85 meter) 64 db. The room is only moderately damped, and of course at that distance in spite of the higher frequency directivity that can narrow the listening window for "audiophile grade" soundstage/image etc etc, you're hearing not only both speakers, but the room.

No doubt since FM noise is broad spectrum and the meter is ungated, even at 1M it's picking up a substantial amount of reflected energy. Which was really my point - unless you listen in an anechoic chamber or outdoors, you're gonna hear more than any simple math might predict.

At 70 - 75 db SPL, I know for a fact that my 25wpc P/P EL34 amp doesn't clip, but since the Fostex drivers hav fully broken in the effect with the 2 watt babySETs is so much more musically involving and intimate, that the big amp seems positively brutish by comparison.

There are some things that can be appreciated, but you'll never be able to measure.



Dave:

what new amps are on the way for your system?
  Reply With Quote
Old 22nd February 2005, 06:21 AM   #37
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by purplepeople
The loss at 3m will be about 15dB so the speakers were getting right around 97dB. If you weren't clipping, you must have been pretty close as that's right around 2W at the speaker.

ensen.
6 dB for every doubling of distance... so lets say 9 dB + 82 dB = 91 dB...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 22nd February 2005, 06:24 AM   #38
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Re: here's the thing

Quote:
Originally posted by chrisb
what new amps are on the way for your system?

You know how fast i work

XO `1st so i can hook up the subs... got the Don Stenton signature amp for that for now... an allen wright inspred EL84 amp at some point... others in between.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 22nd February 2005, 04:03 PM   #39
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Default Yuor place or mine?

So should I clear a spot on my bench?
  Reply With Quote
Old 22nd February 2005, 05:49 PM   #40
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Re: Yuor place or mine?

Quote:
Originally posted by chrisb
So should I clear a spot on my bench?
Didn't someone ask you about selling your monoblocs?

I'm gathering iron for at least 2 more of those...

Highest in the queue is an RH-84 amp... i have the guinea pig together, it just has a nasty noise i have to track down and then it needs the power supply re-repaired (to clean up after the trouble shooting) -- at this point i suspect a bad filament winding on the power transformer.

Also want to see if i can do a 50EH5 amp with just 3 Rs (+ power supply)... that one is just for fun.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  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
Anyone have Jan 1987 Stereo Review "Do All Amplifiers.." cuibono Everything Else 13 16th March 2012 08:37 AM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 06:42 PM
How is this possible? (A hi fi review. Review) terry j Multi-Way 50 5th June 2008 11:46 PM
Dayton BR-1 "experiment" and review. netgeek Multi-Way 20 4th June 2004 09:08 PM


New To Site? Need Help?

All times are GMT. The time now is 09:15 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2