Sensitive bookshelf speakers for Tripath - Page 5 - 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 7th February 2012, 04:28 PM   #41
diyAudio Member
 
tuxedocivic's Avatar
 
Join Date: Jan 2011
Location: Ladysmith, BC
Here are my SF measurements.

Click the image to open in full size.

The top one shows more cavity effect from nearby drivers. The lower shows more baffle losses. Due to their locations on the baffle.

A little about how the were measured. They're about 4m from any reflection. The baffle is 250 x 665mm. They were high passed at 100hz. That was about 5watts. Ignore the tweeter measurement in the graph.

Click the image to open in full size.

I can show the raw if someone would like. The raw is very close to the gated.

Ok, From this you can see how nasty the 3khz and up region is. I have a love hate relationship with this woofer. IMO, it only does one thing. 80 to 1.5khz with better than average sensitivity in a small for 8" box. That's exactly how I use it. Now, I'm no good box designer. If a TL or something can coax more bass from it, all the power to you. But nothing fixes that HF garbage. The little bit of extra bass isn't worth the extra cab volume to go ported IMO.

If anyone wants more info on this woofer, in the summer I plan to:

- 180degree off axis;
- 2.83V SPL
- Ground plane for 25L sealed bass response;
- 80hz high pass power compression; and
- Full range power compression.

Will do in that order in case I pop a woofer. Plan to feed it about 100 watts. Starting at 2.83V doing power doubling.
  Reply With Quote
Old 7th February 2012, 08:22 PM   #42
diyAudio Member
 
Godzilla's Avatar
 
Join Date: Nov 2005
Location: New York
>>> How do you get 94 dB out of a 91 dB driver?

Stick em in corners like Audio Note does and measure that way. Funny to see the measurement technique in the photo above. That's a large listening space.

After many years of wrestling with how to get the highest efficiency from a given driver (or just finding good high efficiency drivers) I've come to realize the tradeoffs and accept them. Anything around 90db per watt plays loud enough for me using an extremely modest low powered T-amp. 95db+ and you can get very loud with the same modest amp. The Eminence Beta12lta is rated at 97db and it goes very loud with very little. It's not perfect but it's a fun listen for sure! The Fostex drivers over 90db all play loudly with little power and even drivers with less efficiency (TB and perhaps Alpair - tho i never had the pleasure of hearing them) fill a room with sound with little power too. My personal cutoff is 87db.

If you want small boxes, make small boxes. You can always enhance with a powered sub(s). If you do not want a sub but want that full range driver magic then you must build larger, more complicated cabinets. They have their own set of unique sonic advantages. This way you get the full bass with only two boxes in your listening room and an extra bit of jump factor to keep your toes tapping and your friends envious.

Unless you go open baffle... lol... which is yet another way to enjoy full range drivers.

Zilla

Last edited by Godzilla; 7th February 2012 at 08:26 PM.
  Reply With Quote
Old 7th February 2012, 08:33 PM   #43
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 Godzilla View Post
Stick em in corners like Audio Note does and measure that way.
That still does not increase the efficiency when measured above the 2pi>4pi corner. Any room gain added does not increase efficiency unless you are cheating.

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 7th February 2012, 09:29 PM   #44
diyAudio Member
 
Godzilla's Avatar
 
Join Date: Nov 2005
Location: New York
>>> Any room gain added does not increase efficiency unless you are cheating.

We both know they ARE cheating.

The drivers i've listened to in my listening room rated from 91 to 95db all sounded pretty much the same as far as efficiency goes. This surprised me (and was a bit disappointing). Pioneer B20 rated at 91, Fostex 127e rated at 91, TB 1808 rated at 93, Fostex 168s rated at 94, Fostex 165k rated at 95... They all sounded loud enough with a cheap T-amp and an expensive (for me anyways) el34 tube amp.

The drivers i have on hand rated at about 87db all sounded less efficient than the above. They consist mostly of various TBs that are three and four inch diameter. But they also performed perfectly fine with the same amps. I am not wanting for efficiency... yet i still seek highly efficient drivers because I feel they offer a bit more jump and excitement.
  Reply With Quote
Old 15th February 2012, 11:33 AM   #45
diyAudio Member
 
Join Date: Dec 2011
Quote:
Originally Posted by planet10 View Post
FF125 plans need just a tiny bit of work and they can be purchased. Betas turned out well, but pointed out some necessary fixes in the docs.
When do you expect I can buy them?
  Reply With Quote
Old 17th February 2012, 08:33 AM   #46
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
You can start buying them now... they still have some missing docs, but it will get updated (sheets added) most pressing pages 1st.

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 17th February 2012, 09:23 AM   #47
diyAudio Member
 
Join Date: Dec 2011
@dave: Great. I looked at your planet10-hifi.com, where do I find the docs, or how do I order them...?
BTW: I live in Netherlands, so I need to get the Fostex drivers from Europe, otherwise I get tons of import tax on top.
  Reply With Quote
Old 18th February 2012, 01:11 AM   #48
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Email me... my address on all of my web sites.

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
Help to build Hi-Sensitive Hi-Power Speakers birdyman Multi-Way 13 1st November 2010 04:44 PM
Building sensitive speakers sifis_samos Multi-Way 13 24th June 2009 02:52 PM
Kit for sensitive bookshelf speakers? Dan Rotigel Multi-Way 1 26th July 2008 09:59 PM
very sensitive speakers NED 209 Full Range 7 15th January 2008 05:54 AM
Class A for sensitive speakers XELB Solid State 4 25th November 2005 06:25 PM


New To Site? Need Help?

All times are GMT. The time now is 09:04 AM.


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