Go Back   Home > Forums > >

Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
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
Old 31st January 2015, 06:24 AM   #1
sayrum is offline sayrum  Germany
diyAudio Member
 
Join Date: Jun 2011
Default Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)

Off topic moved http://www.diyaudio.com/forums/full-...-10-3-10p.html


Hello
I would also apreciate measurements (not sims!) of your cabinet creations.

Quote:
Originally Posted by planet10 View Post
... Scott may have some sims (for that matter i might as well), but he is on the road right now. Any room measure likely tells you more about the room, and anechoic measures would not paint a realistic picture.
By gating one can get accurate measurements down to lower mids / upper base even in a larger (living)room...

Regards
  Reply With Quote
Old 31st January 2015, 07:26 AM   #2
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by sayrum View Post
By gating one can get accurate measurements down to lower mids / upper base even in a larger (living)room...
The speaker is designed to use the room. And the question is about the difference in the LF.It will be room dependent. Take the room out and the measurement is meaningless.

Catch 22.

dave
__________________
Stay safe. Stay home. Respect the 2m bubble.
  Reply With Quote
Old 7th February 2015, 11:27 AM   #3
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by sayrum View Post
Hello
I would also apreciate measurements (not sims!) of your cabinet creations.


By gating one can get accurate measurements down to lower mids / upper base even in a larger (living)room...

Regards
+1, I agree that a measurement would be useful. I am surprised that after all this time, no one has measured and posted results from the XL. Or maybe I missed it?
  Reply With Quote
Old 7th February 2015, 07:53 PM   #4
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by xrk971 View Post
+1, I agree that a measurement would be useful.
More likely confusing.

The FHs use variable damping to tune the bass, the design uses the room as part of the design, so any measure is only applicable to the specific build and the room it is in. Take the room out and you are hobbling the speaker. So measures are only useful to the guy tuning it in hid toom

And knowing those that treasure their measures and give them toomuch creed they would take what they see and generalize it well beyond their applicability.

dave
__________________
Stay safe. Stay home. Respect the 2m bubble.
  Reply With Quote
Old 8th February 2015, 12:37 AM   #5
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by planet10 View Post
More likely confusing.

The FHs use variable damping to tune the bass, the design uses the room as part of the design, so any measure is only applicable to the specific build and the room it is in. Take the room out and you are hobbling the speaker. So measures are only useful to the guy tuning it in hid toom

And knowing those that treasure their measures and give them toomuch creed they would take what they see and generalize it well beyond their applicability.

dave
I guess we will never see a measurement of an XL - even with room effects that is fine at least it gives a point in the range of possibilities. Just kind of surprised that given how inexpensive and easy it is to have measurement capability that I have never seen a single freq response or distortion plot.
  Reply With Quote
Old 8th February 2015, 01:14 AM   #6
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by xrk971 View Post
given how ... easy it is to have measurement capability
Easy to provide reults that are more ghost than useful.

When the only tool you have is a hammer, everything starts looking like a nail.

dave
__________________
Stay safe. Stay home. Respect the 2m bubble.
  Reply With Quote
Old 8th February 2015, 02:54 AM   #7
Bob Brines is offline Bob Brines  United States
diyAudio Member
 
Join Date: Jan 2003
Quote:
Originally Posted by xrk971 View Post
I guess we will never see a measurement of an XL - even with room effects that is fine at least it gives a point in the range of possibilities. Just kind of surprised that given how inexpensive and easy it is to have measurement capability that I have never seen a single freq response or distortion plot.
You seem to have missed Dave point. As I have grown in this hobby, I have come to understand that the on-axis 1 meter response is absolutely worthless when trying to figure out how a speaker will sound in my asymmetrical, poorly treated room with the speakers 2.5m from my chair and the speakers toed out 15*. Yes, I have 0.5m on-axis plots extrapolated to 1w/m on my web site, but that has no bearing on what I hear in my room. The FH3 is a corner horn. Exactly what kind of measurement do you think will be useful in extrapolating to your room?

Bob
  Reply With Quote
Old 8th February 2015, 03:31 AM   #8
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Well if someone wanted an *idea* of the sort of response they can get if they were to build it and if it was placed in a corner in their room at the same distance from the corner, sure it is a useful measurement. The measurement should have the details and caveats of the placement. My question is also about how so many builds and yet not a single measurement.

I guess it comes down to there are two kinds of diy'ers: those who do and those who don't, measure that is. I won't ask anymore in this thread because it seems no one is the least curious what the typical corner placement and xx grams of stuffing in a speaker measurement is. I just want to know where the bass corner is, and how it rolls off for a *typical* 3 ft away from each wall at 45 deg corner placement. Similarly, do we ever listen to a speaker with our ears 0.5m away? No, but that measurement is great for reducing the effect of room modes, and allows a characterization of the cabinet and driver's intrinsic ability.

I appreciate all the measurements that Bob Brines provides and think more people should do the same.
  Reply With Quote
Old 8th February 2015, 03:35 AM   #9
Ultralight is offline Ultralight  United States
diyAudio Member
 
Join Date: Jun 2011
Yes, understood but I think somewhere in between would be a good solution - to have SOMETHING measurable to go on beyond, 'Better bass slam than FH Mk3..." For example, one can say, 'In my room of 15 x 20, and 12 inches from back wall, I measured 35hz at 3db down....." Something like that to just at least give a basic sense. If someone says, 30 hz, that will give a different sense if someone says 40 hz.

All speakers, no matter what do interact with the room - perhaps the FH more, but that is still something true of all speakers.

UL

Quote:
Originally Posted by planet10 View Post
More likely confusing.

The FHs use variable damping to tune the bass, the design uses the room as part of the design, so any measure is only applicable to the specific build and the room it is in. Take the room out and you are hobbling the speaker. So measures are only useful to the guy tuning it in hid toom

And knowing those that treasure their measures and give them toomuch creed they would take what they see and generalize it well beyond their applicability.

dave
  Reply With Quote
Old 8th February 2015, 03:37 AM   #10
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)
Quote:
Originally Posted by Ultralight View Post
Yes, understood but I think somewhere in between would be a good solution - to have SOMETHING measurable to go on beyond, 'Better bass slam than FH Mk3..." For example, one can say, 'In my room of 15 x 20, and 12 inches from back wall, I measured 35hz at 3db down....." Something like that to just at least give a basic sense. If someone says, 30 hz, that will give a different sense if someone says 40 hz.

All speakers, no matter what do interact with the room - perhaps the FH more, but that is still something true of all speakers.

UL
+1 exactly the thing we need. The paucity of data is just puzzling to me.
  Reply With Quote

Reply


Usefulness of In-Room LF Measurements vs. No Measurements (ref FH)Hide this!Advertise here!
Thread Tools

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
Peavey FH-2 FH2 FH1 FH-1 Folded Horn info X-Ray plans please! Peavey MB1 MB-2 Multi-Way 1 31st December 2013 12:40 AM
In-room measurements - Which approach? Defo Room Acoustics & Mods 12 18th September 2013 03:06 PM
Which Loudspeaker for room measurements? atarashi Equipment & Tools 0 16th January 2010 01:30 PM
3rd Order Harmonic Distortion in my in-room measurements wigginjs Multi-Way 7 23rd November 2009 06:21 PM
Single Ended, Single driver: In-room distortion measurements Gerrit Boers Full Range 4 27th November 2007 08:12 AM


New To Site? Need Help?

All times are GMT. The time now is 01:22 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki