The drivers are 12" units from the long past Ditton range. The one's I KNOW have them in are, Ditton 25, 44 & 66. Maybe some others too.
They seem to be long-throw, and they've sounded brilliant in anything I've heard them in. Maybe not ultra detailed in a cab, like many of today's offerings. But bang for buck, they are ace.
Cheers, Lee.
They seem to be long-throw, and they've sounded brilliant in anything I've heard them in. Maybe not ultra detailed in a cab, like many of today's offerings. But bang for buck, they are ace.
Cheers, Lee.
G'day Simon,
This is my effort with an CSS FR125 and Alpha 15, running through Rod Elliot's project 81 Linkwitz - Riley Crossover crossed around 210hz. Had the FR125's for awhile now no idea what to do with them so threw this together, my first OB.
Needs some work though but the bottom end is fantastic, not measured anything, great fun.
Cheers
Bruce
This is my effort with an CSS FR125 and Alpha 15, running through Rod Elliot's project 81 Linkwitz - Riley Crossover crossed around 210hz. Had the FR125's for awhile now no idea what to do with them so threw this together, my first OB.
Needs some work though but the bottom end is fantastic, not measured anything, great fun.
Cheers
Bruce
Attachments
Celestion Ditton woofers for sale somewhere ?
I have Ditton 66s, and their bass is not a patch on that from my OBs with T-bass !
I'm more than willing to pay even £40 per channel for a transformer because it is like doubling the number of drivers fitted without taking up extra space.
Cheers ....... Graham.
I have Ditton 66s, and their bass is not a patch on that from my OBs with T-bass !
I'm more than willing to pay even £40 per channel for a transformer because it is like doubling the number of drivers fitted without taking up extra space.
Cheers ....... Graham.
Assesears said:
Looking good Bruce, I wish I had room for Alpha 15s!! How are you finding the CSS driver's sound?
Simon
Graham Maynard said:
I think you're getting threads mixed up Graham 😀
I agree that T-bass is worth some expenditure, but I have very limited funds so I'm looking for a good value compromise.
Simon
I cut some plinths out of 18mm MDF cutoffs tonight, and fitted 3 carpet spikes to each. Substantial gains in dynamics, focus, imaging, detail, bass... everything really!
I've also now got a whole 8mH in series with the woofers, but still there's a bit much upper bass relative to mid and low bass (actually it's mainly due to a corner-related peak from the left speaker only). I will get a zobel on there next. These speakers aren't quite finished yet!
Simon
I've also now got a whole 8mH in series with the woofers, but still there's a bit much upper bass relative to mid and low bass (actually it's mainly due to a corner-related peak from the left speaker only). I will get a zobel on there next. These speakers aren't quite finished yet!
Simon
Assesears said:
That's exactly the set-up I was considering, until Simon said the CSS wasn't as dynamic as he'd expected (see other thread). I'm now doubting whether I can fit in the 15 incher, but from all the good things I'm hearing, 'er indoors might just have to put up with it!
How do you find the crossover? Which op-amps did you use? (BTW isn't it Project 09?).
Stuey
Stuey,
My comments regarding the CSS were made after only a fairly brief listen on a system that, my friend would admit, was very unoptimised.
He now says after routing/bevelling the edge behind each driver the sound has improved. He also chopped off the sides and installed them as side wings and is becoming rather impressed.... so perhaps my impression was undermined by the quality of the initial build.
Don't discount the CSS too quickly, it's clearly a remarkable unit.
I would personally prefer a lot more "life" though (some have said this can be corrected).
Simon
My comments regarding the CSS were made after only a fairly brief listen on a system that, my friend would admit, was very unoptimised.
He now says after routing/bevelling the edge behind each driver the sound has improved. He also chopped off the sides and installed them as side wings and is becoming rather impressed.... so perhaps my impression was undermined by the quality of the initial build.
Don't discount the CSS too quickly, it's clearly a remarkable unit.
I would personally prefer a lot more "life" though (some have said this can be corrected).
Simon
Sorry Simon, after I wrote that and read it again later. I realised it sounded a bit like I was 'dissing' you! I wasn't at all... I couldn't edit.
Incidentally the same supplier of the CSS here on Oz supplies that Mark Audio Alpair 5 you mentioned. The grey version looks good - may be worth a try.
Cheers
Stu
Incidentally the same supplier of the CSS here on Oz supplies that Mark Audio Alpair 5 you mentioned. The grey version looks good - may be worth a try.
Cheers
Stu
Stuey said:
lol, not at all mate! I just don't want you to miss out on a driver that pleases a lot of people, is affordable and packed with technology & design.
I'd love to know what you pick in the end and how you find it.
Simon
Stuey said:
G'day,
For the CSS being very critical I would say there is a bit of colouring in the mids, other than that its a cracking driver, but for the price who cares.
I believe with all full range drivers is to bevel the edge behind the driver, well thats what I have read on this site.
This is my first OB I am really enjoying it, once OB hard to go back to boxes well thats what they say could be true in my case. I think its that 'Live' sound for me.
Opps its the 12dB/octave version whatever project it is, great piece of kit, running with OPA 2604.
Cheers
Bruce
SimontY said:
... they just want to be cuddled a little. By providing good
working conditions ...
Cheers
Cheers guys, all of you.
Has anyone seen the Delta 12 LFA used OB? I can get 4 of them at a pretty good price, but I'm thinking the spec isn't really close enough to what is considered ideal - very low VAS, Qts 0.47 etc. The Beta 15's might just be too wide for my situation, as I've mentioned.
Sorry to hijack, Simon.
Cheers
Stuey
Has anyone seen the Delta 12 LFA used OB? I can get 4 of them at a pretty good price, but I'm thinking the spec isn't really close enough to what is considered ideal - very low VAS, Qts 0.47 etc. The Beta 15's might just be too wide for my situation, as I've mentioned.
Sorry to hijack, Simon.
Cheers
Stuey
No problem at all Stuey, what you're talking about isn't even off-topic.
I had a long look at all the affordable 12" Eminence woofers and none are amazingly suitable for OB use... the closest was probably Beta 12LTA.
In the end I went and bought 4 x cheap 12" woofers (£15 each!), which have specs closer to ideal for OB use.
Here's the post showing the X-Baffle simulation for the 12LTA and 3 other woofers of interest to me:
http://www.diyaudio.com/forums/showthread.php?postid=1663404#post1663404
Thanks,
Simon
I had a long look at all the affordable 12" Eminence woofers and none are amazingly suitable for OB use... the closest was probably Beta 12LTA.
In the end I went and bought 4 x cheap 12" woofers (£15 each!), which have specs closer to ideal for OB use.
Here's the post showing the X-Baffle simulation for the 12LTA and 3 other woofers of interest to me:
http://www.diyaudio.com/forums/showthread.php?postid=1663404#post1663404
Thanks,
Simon
Thanks Simon - I saw that, and jealousy set in due to you and our US friends having access to cheap kit!
lol! I didn't realise it was available till it was shoved right in front of my eyes... maybe there's something similar in Aus. Watch this space (or rather the other thread) for impressions of the cheapo woofers.
Simon
Simon
Hi everyone, it's been a while.
I'm still gathering parts and drawing up initial plans for my next speakers but these are still going strong and I've made a couple of changes since last posting.
I'm temporarily using larger transformers for the T-bass circuit, because they've been bought for the new project and I felt I should try them out. 500VA does sound better than 100VA but, I think, due to losses in the series coils the difference wasn't massive - just slightly louder, deeper, tighter bass.
I was running well over 2ohms worth of inductors in series with my woofers, which I've since swapped for a single <1R ferrite-core 8.2mH coil. The change was incredible, with much deeper, louder and quicker, more dynamic bass. It sounds less lazy (not that it sounded lazy before) and can really surprise sometimes. I still find there's a touch excessive upper bass, due to the room I believe. This is only noticeable on certain music, so it's fairly acceptable.
The next woofers have better OB specs and as simulated should have an extra couple of dBs in the low and mid-bass region and a dB or 2 less in the upper bass and lower midrange, which should help them sound more correct.
Simon
I'm still gathering parts and drawing up initial plans for my next speakers but these are still going strong and I've made a couple of changes since last posting.
I'm temporarily using larger transformers for the T-bass circuit, because they've been bought for the new project and I felt I should try them out. 500VA does sound better than 100VA but, I think, due to losses in the series coils the difference wasn't massive - just slightly louder, deeper, tighter bass.
I was running well over 2ohms worth of inductors in series with my woofers, which I've since swapped for a single <1R ferrite-core 8.2mH coil. The change was incredible, with much deeper, louder and quicker, more dynamic bass. It sounds less lazy (not that it sounded lazy before) and can really surprise sometimes. I still find there's a touch excessive upper bass, due to the room I believe. This is only noticeable on certain music, so it's fairly acceptable.
The next woofers have better OB specs and as simulated should have an extra couple of dBs in the low and mid-bass region and a dB or 2 less in the upper bass and lower midrange, which should help them sound more correct.
Simon
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