Looking for advice - 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 8th November 2012, 05:51 PM   #1
diyAudio Member
 
Join Date: May 2010
Location: South East USA
Default Looking for advice

I've finally finished my 300B SET amplifier project (sounds awesome!) so now I'd like to start a FR speaker build. I'm knee-deep into trying to understand audio circuits, so I don't really have the brain-power to learn speaker theory too. So, I'm looking for advice and suggestions for PROVEN designs that meet my needs.

I need...
a Flat impedance Curve (Tubelab SE 300B tube amp)
high efficiency (working with 8W of power)
a Wide Sweet Spot (good off axis response)
Prefer 100% speaker (no caps, no filters, no super tweeters or helper woofers)

I prefer...
Drivers in the under $300 range (for both). This isn't strict, but I'd like to be in this neighborhood.
Plans for 3/4" Baltic Birch ply. Preferably something that could fit on a 4x8 foot sheet.
Straight cuts. I have a router and medium wood skills, but I still would like an easy plan.
Floor standing speakers (up to 6 feet tall). Large is ok. I do not want bookshelf speakers on a stand.
I like the Curvy Changs, Pencils, and Lotus; I don't like the Frugal Horn.

I have...
An unfinished basement. The listening area is approximately 25' wide, 50' deep, and 10' tall. The speakers will be on concrete, but there is a lot of clutter and floor rugs. There isn't a noticeable echo effect (like you would get in an empty unfinished basement).
I am currently using Parts Express TriTrix speakers (89db TL) and they sound remarkably good for what they are. The new FR speakers will go side-by-side with these.
A fairly powerful subwoofer. While I would like the new FR to go pretty low, it's not absolutely required.
Since I own the basement (and the wife owns the living area), there is no WAF to consider. There are also no size limits (although under 6 feet tall is desired for manageability).
I listen to many types of music - Classic Rock, Rock, Blues, Metal, House/Techno. Since this will be a compete second system (amp/speakers) it doesn't have to play all types of music well (but would be nice if it did).

Other...
I'm curious about ENABL'd speakers.
I don't know why, but I am somewhat drawn to Mark Audio speakers.
I've never actually heard a proper FR speaker, so I'm shooting in the dark here. I hope I like the sound, but if not I won't be bitter.


Long story; short... I would like a recommendation for a proven speaker and enclosure configuration. Something that I can build without having to do my own calculations (I'll save that for a 2013 project!)

Thanks!
  Reply With Quote
Old 8th November 2012, 10:27 PM   #2
diyAudio Member
 
bushhorns's Avatar
 
Join Date: Jul 2011
Location: Godwin North Carolina
Default just a thought!

Quote:
Originally Posted by acceler8 View Post
=

I have...
An unfinished basement. The listening area is approximately 25' wide, 50' deep, and 10' tall. The speakers will be on concrete, but there is a lot of clutter and floor rugs. There isn't a noticeable echo effect (like you would get in an empty unfinished basement).


Long story; short... I would like a recommendation for a proven speaker and enclosure configuration. Something that I can build without having to do my own calculations (I'll save that for a 2013 project!)

Thanks!
With that amount of space I would not Frugle either! I would build myself a couple of nice Corner Horns in a Fullrange single Driver!
  Reply With Quote
Old 9th November 2012, 01:48 AM   #3
jamesdb is offline jamesdb  United States
diyAudio Member
 
Join Date: Jun 2007
If I were you, I would try the Alpair 12P in a Pencil, check this thread alpair 12p. First listen he has a 45 tube amp, should be great with your 300B
  Reply With Quote
Old 9th November 2012, 08:25 PM   #4
diyAudio Member
 
Join Date: Oct 2004
With regard to your "needs" I would use a minimum highish sensitivity 8" driver in a rear loaded horn. Fostex 208e Sigma in a RCA-Fan rear loaded horn is what I used: Acoustic Horn - Backload K-Horn . Then run one of those Fostex supertweeters (T500 or TA90) over the top with a single cap. This should fill your large room with only 8 watts.
  Reply With Quote
Old 9th November 2012, 08:37 PM   #5
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
I dunno about corner horns 25ft apart - but the room certainly sounds big enough to support a large BLH of some type

First thing that comes to mind is the Woden Avebury and Alpair12P .
Woden Design | Avebury
Click the image to open in full size.



They would certainly take more than a single 4x8 sheet, and the curves to side panels are not optional, but could be rough cut by hand with jig saw - with that much unfinished floor space, use a compass jig to route curved pattern from MDF, then clean up the curved panels with pattern following bit. All the other parts except for the small deflector panels are straight cuts & butt joinery.

Of course, life is much easier with access to a CNC machining center or flat bed router.
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi

Last edited by chrisb; 9th November 2012 at 08:45 PM.
  Reply With Quote
Old 9th November 2012, 08:57 PM   #6
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Corner horns 25ft apart aren't going to cut it. Not unless you're near the back wall, in which case wideband drivers aren't what you need. Think Altec Voice of the Theatre & you're on the right lines.

Assuming the A12P, the pensil would fit the requirements since it has a relatively flat impedance. It's no subwoofer since I traded extension for efficiency & a fairly unreactive load, but it's not too bad. Otherwise, name your poison, although there aren't all that many designs for the A12P out there at the moment as it's still a fairly new driver.

Just as a general point, wideband drivers aren't really ideal for classic rock / metal / techno. They can do a decent job, but a good multiway will have an edge.
  Reply With Quote
Old 9th November 2012, 09:33 PM   #7
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
I don't the science of all this like the others who have replied, but I built a small Mark Audio set of FR speakers for use with a small tube amp and they are outstanding. I will be doing more Mark Audio projects. So, based on my experience and what the others in this thread have said, I'd recommend a Mark Audio project like the Alpair 12P Pencil.
Just my 2 cents.
Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 9th November 2012, 10:04 PM   #8
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
Quote:
Originally Posted by acceler8 View Post
I need...
a Flat impedance Curve (Tubelab SE 300B tube amp)
high efficiency (working with 8W of power)

I have...
An unfinished basement. The listening area is approximately 25' wide, 50' deep, and 10' tall. The speakers will be on concrete, but there is a lot of clutter and floor rugs.

I listen to many types of music - Classic Rock, Rock, Blues, Metal, House/Techno.
With the A12p Super Pencil, you may want to have a little more power on tap. I'm thinkin' the 300B amp will be running out of gas when it's time to get up and "dance".

jeff
  Reply With Quote
Old 10th November 2012, 05:06 PM   #9
diyAudio Member
 
Join Date: May 2010
Location: South East USA
Thanks for all the great ideas!!!! It sounds like some Alpair 12P's are in my future! I'll go ahead and get the drivers even though I'm torn on the box design. I love the simplicity of the pencil, but the Avebury is a thing of beauty!

Related question: What are the sound characteristics of a simple design like the Pencil and the crazy path through the Avebury? Is the extra wood/effort worth it (or are the differences minor)?

Final Question: Has anyone tried ENABL'd 12P's? Are the even available?
  Reply With Quote
Old 11th November 2012, 06:36 AM   #10
bqc is offline bqc  United States
diyAudio Member
 
Join Date: Dec 2002
I have not listen to a SuperPensil but I have built and listen to Avebury with A12p. May be someone else who has heard both can comment on the difference. But I imagine the Avebury will sound bigger and go lower.
Avebury A12P build
Those are phenomenal speakers. The A12p mids and highs are sweet. The bass is amazing. I can hear down to 25hz in room. My room is 13' X 35' x 9'. I power them with a 5 watt F2J clone and they are plenty loud for me. Your basement is a lot bigger than my room, but I imagine you don't need to place them 25' apart. Granted, the wider the separation, the larger the sound stage, but if you dont have a lot of power to spare, then you can place them closer together say 10-15 ft apart and sit at about the same distance away. After experimenting with placement, I settle on placing them 20" from back and 20" from side walls and 8 ' apart. If you want a box for a single full range driver that goes from 25hz to 20kz, the Avebury is hard to beat. I also placed 1" of felt instead of the recommended 1/2" on the back chamber wall parallel to the cone to provide a bit more dampening. Auto junk yard is a good place to find cheap 1/2 in felt. They are used to line cabin floor and trunk under the carpet. Bring an exacto knife if you go there. It'll make it easier to cut them out of the floor.
  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
Need some advice where to install LED, also power socket advice. Mull3t Construction Tips 14 28th May 2012 04:32 PM
need some advice... skierkid450 Introductions 2 13th March 2009 02:09 PM
Need sub advice Vivek Subwoofers 36 14th May 2008 10:17 PM
Poster in Musical Instrument forum needs bridging advice on BrianGT 4780 advice moving_electron Chip Amps 0 16th February 2005 12:37 AM


New To Site? Need Help?

All times are GMT. The time now is 08:51 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