Greenhorn Curvy Chang Build - Page 11 - 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 24th March 2009, 08:52 PM   #101
diyAudio Member
 
Join Date: Mar 2008
They look great. Try raising them 3 or 4 inches off the ground.
  Reply With Quote
Old 25th March 2009, 05:07 AM   #102
Aengus is offline Aengus  Canada
diyAudio Member
 
Aengus's Avatar
 
Join Date: Apr 2004
Location: Victoria, BC
Quote:
Originally posted by Dust

I am trying not to be too critical as they are new, but they are a little dissapointing. Mids are good ,quite detailed. Tinkley things are tinkly. theres definately enough treble, but the bass is just not there.
Hi Dust

I'm using the Curvey Harveys in (what looks like) an equivalently large room, and I'd have to say that the only aspect that concerns me is that the bass is somewhat shy. I think that rooms this size just need some augmentation there.

Personally, I'm reluctant to add a subwoofer to a double-BVR, since there are smaller speakers that will do the job if one is going to augment the bass. But I'm a bit stymied about what to try next, since the Harveys please me a great deal in all other ways. I suppose I might try adding some form of bass augmentation to see how it sounded, and then consider how to proceed.

I'd appreciate hearing how your next steps - whatever they may be - work out for you.

Regards.

Aengus
  Reply With Quote
Old 25th March 2009, 09:42 AM   #103
Dust is offline Dust  United Kingdom
diyAudio Member
 
Dust's Avatar
 
Join Date: Nov 2008
Hi guys... Well I've spread them out as far as I can and moved them closer to the corners. This has helped the bass somewhat ,but still pretty lean. Early days so I won't get too cranky! I'll try getting them up as per dzz's suggestion. I also like the look of the Shadow SD12. I am hesitant to add a sub too as I used to have a Rel which was slow and ponderous,very hard to integrate. In the end I sold it as it drove me mad constantly fiddling with it. So I would need something that would keep up with the 207s. It doesn't have to be John Paul Jones on 11(though I wouldn't say no) but just more oomph. Interestingly, I slapped on some Focus, Moving Waves. Plenty of bass there so they can do it. Marce, your Curvy thread inspired me to build these beasties so thank you for putting that up.

Dust
  Reply With Quote
Old 25th March 2009, 04:18 PM   #104
diyAudio Member
 
Join Date: Mar 2008
Adding some EQ is not a crime, especially if coming from a digital source. Lower bass is room-specific anyways. There can be no one "proper amount" from the source.

I say if it sounds good it is good.
  Reply With Quote
Old 26th March 2009, 08:01 PM   #105
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs

The real thanks goes to Scottmoose and Ronc for designing the beasties and tempting me. It was love at first sight for the looks, and later love at first listen for the sound. My previous speakers have included some KEF 104/2s driven by an Audiolab 8000A, not short of bass, but to be honest I prefer the CCs presentation.
What type of amp are you using. I currently use SE el84 valve monoblocks, and get more bass out of them than I do with the Audiolab witch has 10X the power. The low impedance output with high damping factor dosn't work very well with the drivers, adding series resistance helps damp the damping and improves the bottom end with solid state amps.
A couple of idea's that may be worth looking at are:
Have a look at what damping material has been used in the other builds, I used a relatively light, loose fibre wadding (fastened with double sided tape, easy to change and reline), looking at the photo's yours looks quite a bit denser material. I dont know whether it would help the bass.
The addition of the FT17 or other super tweeter again may be worth investigating, the extra sparkle in the top range may help to improve the perception of bass. The caveat here is I have Planet 10 fully modified, ENabled 207's, which of course is a third avenue to examine.
If you have a more normal sized room (ie sub 20' celings) you could always try them in that, it would be an interesting experiment to see if roof loading does play a part and how much.
Thats the beauty of building your own speakers and this site, there are so many things to experiment with, and some interesting discourse on the results, and I've found that even if an idea seems to defy logic its worth a try, youve nothing to loose.
  Reply With Quote
Old 26th March 2009, 10:00 PM   #106
Dust is offline Dust  United Kingdom
diyAudio Member
 
Dust's Avatar
 
Join Date: Nov 2008
Hi Marce. Funny, I had an 8000A too. Pretty good amp. I wanted to try a tube amp so managed to fine a Cayin 88t. It's about 40 watts I think. Sounds good but I'm not blown away. How do I find out what the amps output impedance is? I'm not very technical. It has 8,4 and 16 ohm taps, but I hear little difference in them.
I was wondering about the wool felt I used for damping...might pull some out later see how they sound. Don't want to get ahead of myself here until I've tried the phase plugs and coating the cones. I've been practicing painting some old drivers with mod podge and cutting out the dustcaps. If that goes well then I will do the full enABL. I have a pair of Impulse taus in my study. they sounded thin until I put lots of old thick cutains up and are much better now so I think Curvys room is playing a large part in their sound. I would need a small crane to swap CC's with the Taus. Mod podge and Phase plugs Saturday. Will keep you posted.
  Reply With Quote
Old 26th March 2009, 11:16 PM   #107
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 Dust
Cayin 88t. It's about 40 watts I think. Sounds good but I'm not blown away.
KT88s? If it has sufficiently well filtered power supply, you can remove the feedback (after triode strapping it), and get a better sounding/more suitable 20w amp. Also check the quality of the coupling caps.

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 27th March 2009, 08:57 AM   #108
Dust is offline Dust  United Kingdom
diyAudio Member
 
Dust's Avatar
 
Join Date: Nov 2008
HI Dave, I'm very interested in doing that. Can you explain a little more?, or point me in the right direction? I am just about able to set the bias but it makes me very nervous poking around a live amp. Maybe when I know more(lots more!) its a possibility. I changed the KT88s for KT90s. I am reading all I can in the Tubes section here but alot of it is way over my head.
What is triode strapping?

Thanks.
Dust
  Reply With Quote
Old 27th March 2009, 09:45 AM   #109
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 Dust
What is triode strapping?
In its simpliest incarnation you connect the screen grid to the plate thru a resistor. Turns the pentode into a (psuedo) triode. You get half the power, but it is usually sweeter and more linear so you can remove or reduce the amount of feedback. The feedback is often used to reduce hum so to completely remove it you need to have a good quiet PS.

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 27th March 2009, 10:10 AM   #110
Dust is offline Dust  United Kingdom
diyAudio Member
 
Dust's Avatar
 
Join Date: Nov 2008
Thanks Dave. I'll look in to that.
  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
Curvy Chang thread gychang Full Range 681 2nd May 2012 01:01 AM
Curvy Chang valvehead223 Full Range 1 20th April 2009 04:12 PM
Curvy Chang Opinions abpea Full Range 8 19th November 2007 12:44 PM


New To Site? Need Help?

All times are GMT. The time now is 12:39 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