Latest DIY Speaker and Amp Project

That's looking really impressive - I might have to look at the PC software solution again in the future.

The sound traits you describe remind me of the Peak Consults so I'm pretty sure it's an Audio Tech thing as you say. Smooth and effortless with a cavernous soundstage and great scale.

I think coming from the horn like dynamics of the ATC, most drive units tend to sound a little more rounded. The Raal sounds interesting as well. I admire your tenacity in all honesty. I approached my project from the other angle of getting the sound right, then thinking of a way to package it attractively. I'm struggling with the latter part!

Is the actual in room response shelving down with your speaker or are you now aiming for a flat response from the lower mids upwards?

 

Thanks Mike.

On quality recording such as the Chesky stuff etc. I get excellent results but on mp3's and the like it show the defects and you tend to be drawn to that rather than the music. However some FR shaping using target curves, especially ones that lower the treble and upper mids, give a more pleasant sound hiding some of the hash present in lower bitrate mp3's or poor quality CD's. However you loose some realism and feeling with the quality recording when you doing so. I'm still playing but might have to compromise and have an mp3 setting and another for decent quality recordings.

Any suggestions on what to try Mike?

 

You don't want to listen to anyone else's suggestions!

I'm surprised the mp3's sound so bad though - are they really heavily compressed? I can listen for hours to 192 kbps AAC's - OK not the realism of CD but close enough and rather smooth.

 

Most are 128kbs or VBR, All the mp3's I've ripped myself are 320Kbs and these mostly sound fine. Please bear in mind an awful lot of these are 'dance' music and that isn't known to have the very highest of mastering standards even before low bitrate mp3 conversion.

From experimentation, recessing the mids and treble can work wonders but it isn't a solution for every source. Maybe I should have a clearout of the junk quality mp3's but am reluctant to do so because there's some great tunes in there.

 

nice job!!!

you did a box once with a atc 3", what were your impression on that in termes of sound and compared to these,what do you think will be different?

what's the thickness of the front panel?

sorry i just saw the construction pics,
i see very well the details

i heard the raal the biggest they make with a 6" audiothechnology from solen and it plays very well,the woofer they used was 12"eton in a big sealed cabinet.it actually plays well but not totally sold with the mid still considering the atc for that matter.

again very well done

 

If they sound as good as they look you are onto a winner. I would help you sell them if you wish.Any idea on price yet. Any discount for forum members, not after a freebee.
john

 

Damn ... these look good!

Incidentally, what kind of adhesive did you use to stick the lead sheeting to the mdf? (I was thinking of trying out lead as a damping material myself.)

Ian

 

Hey Ian, thanks.

Regular tradesman type contact adhesive will do the job admirably. Lead weighs a ton(watch your back when moving the speakers!) but does a superb job damping panel vibrations. It laughable when you compare a sheet of 18mm MDF treated with lead sheet compared to the same but with bitumen sheet. Of course there's no harm in using both at the same time.

 

have you finished them both now ....?

 

Hey Pete, yes, both finished. Have been for a while now.

 

A real mix and mash of amps I've been auditioning in an effort to choose a victor. On tweeters I have pinkmouse' Symasym, on the upper mids I have Aussieamps NX400NL, on .5 way mids I have the cheap and nasty Technics affair and on bass I have them wired in series to a UcD400HG with HxR regulators. Phew, OK think I got that right.

I choose the NX400NL or specifically the NX400NL-LSP out of that lot. They're on their way from Australia as I type so I'll be getting another nice boost once they arrive. Just have to find the time to get them in the cases and not leave them lying around, ghetto style, on 9mm MDF boards.

 

The GB300 are now with Tim who bought them from me late last year so a comparison isn't possible.

I went with the NX400NL-LSP primarily because its the best sounding out of the Symasym and UcD400HG-HxR. I didn't go with pre-built fuckwit proof SKA because I believe the NX400 to be roughly equivalent. Its tough to say for certain but going by memory the two are certainly impossibly close, maybe the NX400 has slightly more control and presence in the bass, I say this because it was the first thing I noticed when I fired it up. So your probably thinking "well if they're about the same what swayed your decision?". That's easy to answer, the NX400NL-LSP has built in DC protection and also balanced XLR input:



It was a no brainer with the cost of the drivers they're connected to. The relay also has the nice side effect of being able to mute the output, eliminate turn on thump and provide an instant off when powering down instead of the usual several seconds of audio fading as the caps discharge. Maybe not a big deal but its less DIY and more polish and you know I'm all for that. The balanced input will allow me a nice easy connection to my existing kit which is all XLR.

UcD400 is a great bass amp. I don't like Class D on mids and highs. They're pretty dry sounding, have you noticed that? But that sound works well with bass, really tight and well defined plus there's power on tap to hit hard and precise. The NX400 is likewise strong here. Both are similar in power output and the differences are minimal TBH.

BTW Nice work on the regulated SKA. I wouldn't mind putting the NX400 up against that.

 

Mighty kind of you Simon. I'd really enjoy stopping by yours sometime. We're having the DIY meet in Chatham as PM is arranging the venue. Its a two day event again so it'd be no effort to drop in during the evening, listen to some music, chat about DIY and debate who has the worst taste in music.

I've got a 'Head' bag(anyone remember these things) from the early 90's that I could probably fit a single LGT in.

I'll be bringing some amps and the PCXO so if we have time maybe have play around with that.

 

Hi Shin, is this open to anyone? If so, can you please post details?

 

Dev, your more than welcome. Details are still being firmed up so I'll post back with more info. I know Simon wanted to come along to the last one but distance was a problem, he's got no excuse this time I also know you and him are mates so if a group of you want to get together and come down that's cool too. The more merrier.

Simon, yep that's a Head bag although not the monstrosity I'm talking about. They did a HUGE bag in the early 90's that you could fit a small person in - not joking because when I was at school we stuffed a mate in there and dragged him around during a whole break period. T'was great fun... for us