Jump to content

Sign in to follow this  
acg

Deep End DIY - My first speaker project

Recommended Posts

I had a client like that/me.  The  scope of the (large) project kept getting bigger,  more complex, and troublesome and eventually we had a falling out over it. 

 

Me: You can't just keep shifting the finish line every couple of months, it's a waste of my time. 

 

Client: Just get it done already, you are costing me too much. 

 

 He didn't stop  and I couldn't hit that moving target. 

Share this post


Link to post
Share on other sites
On 18/10/2019 at 11:37 AM, acg said:

They are Kong at killing reverberations but from what I can figure out may not impact the room frequency response too much.

It depends on how you measure it

 

Share this post


Link to post
Share on other sites
15 minutes ago, davewantsmoore said:

It depends on how you measure it

 

Care to elaborate Dave?

Share this post


Link to post
Share on other sites
4 hours ago, Grizzly said:

I absolutely love that Ortofon chose to make something that could easily be referred to as MC Hammer.

Doesn't sound like one though...

Share this post


Link to post
Share on other sites


19 hours ago, acg said:

Care to elaborate Dave?

They're problem doing a lot more than you think, if you look at the LF with a higher frequency resolution and/or a finer scale of dB.

 

Typical "frequency response" measurements are not very useful, IMVHO.

Share this post


Link to post
Share on other sites
41 minutes ago, davewantsmoore said:

They're problem doing a lot more than you think, if you look at the LF with a higher frequency resolution and/or a finer scale of dB.

 

Typical "frequency response" measurements are not very useful, IMVHO.

 

Dave, are there ways to look at LF with a higher frequency resolution?

 

The lowest strings of a double bass, bass guitar or even a cello tends to hit a room mode right where I stand at my desk.  It is really distracting, and if a VPR or two can be used to reduce that effect I will be very happy.

 

I've never had bass as soft or textured or powerful as I have it now with the Bass Cannons and room modes are very easy to find just walking about the room.  The listening chair seems to be the best spot for bass because it is right in the middle of the axial walls and I have the windows directly behind me letting plenty of LF out of the room.

 

Regarding the VPR's, I should get in and order some foam so I am ready to make them up at Christmas.

Share this post


Link to post
Share on other sites
43 minutes ago, acg said:

Dave, are there ways to look at LF with a higher frequency resolution?

Longer measurement window, but it comes with it's own problems.

 

The real thing is, is the steady state response of the room worth looking at in this regard.    For levels, it is perhaps (and levels are very sensitive, eg. +/- a dB or two at 50Hz vs 100Hz can be massive)

 

... but otherwise I would be looking at the data in other ways.  Waterfalls, ETC, wavelet, etc.... and with other test signals.   Although aside from finding really specific problems, then even that might be not too useful.   You just can't really have too much "treatment" at LF.   The only challenge is fitting it in, and keeping it even with the HF.

 

 

43 minutes ago, acg said:

I've never had bass as soft or textured

This is typically what happens when you have an even frequency response which doesn't have any extreme peaks or cancellations.     Peaks of even a few dB drown out everything as they sound so much louder than everything else (a few dBs is a lot in the bass for perception of loudness)

 

.... once you get rid of all the "drowning out", and all the "gone missing" .... then bass can have incredible "texture".   😎

Share this post


Link to post
Share on other sites

What I love about modern valve amplifier builds is the possibility and benefits of mixing old and new technologies.  Lately, I've been sneaking an hour here and there to advance the electronics projects and have managed a few small milestones.  Have a look at the photo below...

 

1702757005_LCRFilter.jpg.48fb22151eefe5daf4c4cec8699d457d.jpg

 

That is the RIAA correction filter for one channel of my upcoming LCR phonostage.  Two handsome Slagle inductors on mumetal cores, some Jupiter copper foil caps and some custom cut TX2575 Z-foil resistors that should make a frequency response flat line out of the very wobbly riaa cut of the records.  It all sits on a 4mm thick aluminium plate that in turn sits inside an off-the-shelf EMI/RFI box which in turn will sit inside a 4mm thick steel sarcophagus in an effort to maintain a very low noise floor in the circuit.  It sits between a pentode first stage and triode second stage.

 

So, above is a nice example of the old-school purists method of sacrificing resources and real-estate with rats-nest wiring.

 

So the tubes have to be supplied 6.3vdc and I had alook through my pcb box to find a challenging build using paralleled LT3042 ultralow noise LDO's.  These things are tiny...0.5mm pitch MSOP.  I've never soldered them before so decided to order the parts and give the little psu a go.  See below, it worked...

 

606144485_DCPSU.jpg.9b2205bcec93e0cda6fb2edb737a62e7.jpg   

 

That green pcb has two 6.3V 1A power supplies including all rectifier diodes, filter caps and heat sinking (later two items under the board).  I hand-soldered the little bugger and it took a couple of hours but it worked first time!  Those big (haha) yellow 1205 caps make the LT3042 look tiny.  What is not shown is that little green pcb is going to be connected to two relatively huge EI filament transformers.

 

Anyway, that is my rather extreme example of modern and vintage electronics used in the same component, a RIAA phonocorrector.  Can't wait to get it finished.

Share this post


Link to post
Share on other sites


How interesting!  Thanks @Ian McP

Seems a similar trajectory to mine...

Share this post


Link to post
Share on other sites
On 19/12/2014 at 5:39 PM, acg said:

So, something turned up the other day.  Whatever could it be for?  A Christmas project perhaps...

wow - just noted today is 19 Dec - happy epic DIY project thread anniversary day !!!

 

Anthony you are an inspiration.

Maintaining the drive and vision for 5 years is phenomenal - well done...

...and getting very close to completion...I won't ask "which Christmas?"

 

Easily the most ambitious DIY project I've seen, and tracking progress from inception to today has been both enjoyable and informative.

Thanks for including us in your journey!

 

cheers

Mike

Share this post


Link to post
Share on other sites
7 hours ago, almikel said:

wow - just noted today is 19 Dec - happy epic DIY project thread anniversary day !!!

The "in by Xmas?!!" joke is still funny every year too  :D

 

(Seconded).

Share this post


Link to post
Share on other sites


On 19/12/2019 at 2:16 PM, almikel said:

 

...and getting very close to completion...I won't ask "which Christmas?"

 

 

 

Maybe next Christmas...

 

Although stuff is still getting done.  The plan, assuming the temperature is bearable in that little tin shed, is to get back on the lathe next week or so to sort out the front half of the upperbass horns. 

Share this post


Link to post
Share on other sites
4 hours ago, acg said:

Although stuff is still getting done.

that's the impressive bit - there's been inexorable progress towards the end goal, with no compromise on vision.

 

As a lazy DIYer I remain in awe of your commitment...it will be finished when it's finished...the elephant will be eaten...completely 👍 (please excuse the metaphor if you're a vegetarian).

 

cheers

Mike

 

 

Share this post


Link to post
Share on other sites

Small steps...

 

So, finally, the shelf bass traps are complete and in place.

 

492654406_ShelfTraps.jpg.7d8cc06ca1edcde24af6d6f4d578ee3b.jpg

 

They were done in fits and starts but we got there in the end.  I love having them in the room with the cane facing and the lovely wood tops...the room feels nicer to be in just for their presence.  The vinyl flips have also worked out well, here's one with the lid up to show how they work.  Will have to resist the urge to treat them just like a normal shelf and just load the top of them up with "stuff" but it is a handy place to put the tablet that controls digital playback.

 

767494653_LidUp.jpg.b05e290e9bf33dcdb741814609d4f5e5.jpg

 

Talking about digital, Mark Dohmann was here last night and he did the  "in-house" final setup of the Helix2/MC Anna for me.  What a pleasure to meet the man in person and what great service.  We stayed up well past my bedtime listening to various curiosities from Talk Talk among others and finished with a nasty old John Lee Hooker record.  What has that got to do with digital?  Well, nothing really, but the little 1's and 0's have just been o.w.n.e.d. 

 

 

Share this post


Link to post
Share on other sites


Oh yeah, and two pair of replacement horns ready to go onto the stack...

 

Rnd2.jpg.61cb08ebe4f8c86083d751518c575f65.jpg

 

 

Share this post


Link to post
Share on other sites
On 20/02/2020 at 10:09 PM, Mat-with-one-t said:

What happens next!?  What happens next! ?.??

This.

Share this post


Link to post
Share on other sites
2 hours ago, realysm42 said:

This.

Bit of an anti climax.....

Share this post


Link to post
Share on other sites
Posted (edited)

Yeah guys, sorry, no time for audio with only one day off work so far this year, even with this pandemic.  Crazy busy, but nice to be so right now.  Might be able to start taking the odd weekend off in a month or so...perhaps...I doubt anybody will be travelling anywhere for leisure this side of spring or even summer so those weekends will probably translate into audio progress.

 

The system will be finished, just not quickly.

Edited by acg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Classifieds Statistics


    Currently Active Ads

    Total Sales (Since 2018)

    Total Sales Value (Last 14 Days)

    Total Ads Value (Since March 2020)
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By mwhouston
      To get a grasp of where I’m am going with this thread you need to of read or have read  this article. 
       
      https://www.stereophile.com/content/gramophone-dreams-34-salt-cellar-system
       
      If you go no further at the least it is in interesting read. Some will go “meh” others will take it on board to search for better reproduction. Maybe even build there own SC. The challenge I have given myself and would like to throwout to others is can you build or hobble together a “Salt Cellar“ (SC) system. The core of a SC system is purity of sound, dynamics and immediacy. 
       
      These are the constrains/opportunities I’m am pursuing;
       
      a monaural system high efficiency speakers - horns where possible a tube low power Class A mono power amp or even tube integrated amp vintage tubes mono vinyl phono playback from mono cart or mono wired phono stage  ultra short non shielded interconnects and speaker leads of Silver plated wire wrap wire ?

      Ive been tossing this temp system around since I read that article and now have  (in my head) a whole SC system. So cutting to the chase I’m going to build a mono integrated wine box tube amp based on some vintage 807 and RCA 6SN7. Half the 6SN7 will be a single stage preamp and the other half the driver for a Suncalc designed 807 amp.
       
      Speakers will be my Beyma 12” concentrics with a Altec 511B horn and FatalPro driver. The horns will handle mid-range and the tweeter in the horns super tweeters. Overall efficiency about 98db. 
       
      Im current working three other projects but now taken on a forth for a true SC system. Any other takers out there. 
    • By gypr1961
      Item: Avantgarde Zero 1 XD Active Speakers DSP
      Location: Brisbane
      Price: $17,500 ONO
      Item Condition: Mint
      Reason for selling: Time for a change
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info:

      These are the top of the line model, above the pro model and come with DSP, digital and an analogue (A/D card) for turntables etc.
       
      They are incredibly dynamic! They sound just as good when theyre shaking the house or playing whisper quiet. 
       
      I have all original packing so transport is not an issue
       
      As im going to need a complete new system Im happy to look at trades
       
       
      Specs can be found here https://www.avantgarde-acoustic.de/en/products/zero-serie/zero-1-xd.html
       



    • By leqt1969
      Item: Avantgarde Acoustic UNO speakers
      Location: Bexley NSW
      Price: $8,500 ONO.
      Item Condition: Used but in great condition, superb sonically.
      Reason for selling: Going different direction
      Payment Method: Pickup - Cash
      Extra Info: Advertise on behalf of a friend in Bexley NSW who doesn’t have SNA account.
      Grab your chance.
      Avantgarde speakers are rarely seen on second hand market. These speakers are in great condition and sound superb. Still have original box but pick up preferred due to weight.
      Audition can be arranged for serious buyers.
       
       
      Photos: Advertisements without photos of the actual item will not be approved.



    • By La scala
      Item: Klipsch La Scala speakers 
      Location: Perth metro
      Price:  $3500
      Item Condition: Great for their age, 1978 ish Alnico 
      Reason for selling: Told to shed some gear
      Payment Method: Pickup - Cash,  Bank Tranfer COD Only
      Extra Info: East coast buyers, can do live video demo via FaceTime 
      These have the favoured Alnico Magnets, serviced X Overs and updated Mundorf Capacitors, some body bracing to tighten bottom end.
      All drivers work spot on.
      Sound wise, these have a uncanny ability to project a very large wall of sound with fine detail and dynamic authority.  Impressive as I am normally into Electrostats, Planar and Ribbon speakers. Very versatile and allow use of Set Valve Amps due to their 100db efficiency. 
       
      Photos: Advertisements without photos of the actual item will not be approved.




    • By MarcAL
      Item: Altec Lansing MR II 564 Large Format Mantaray Horns
      Location: Sydney South
      Price: $220 the pair or $125 each
      Item Condition: Used, good original condition, see pictures
      Reason for selling: NLR
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info: Altec Lansing MR II 564 Mantaray Constant Directivity Horns for large format 1.4" compression drivers.
      PM me if you require large compression Altec drivers to suit.
      Nominal Dispersion Angle: 60 x 40 degrees.
      Useable Low Frequency Limit: 500Hz.
      Construction: Heavy duty, weather resistant polyester/fiberglass.
      Finish: Standard Altec grey with a few minor scratches, can be resprayed another colour for an additional cost.
      Suitable Drivers: Many 1.4" throat compression drivers or Altec Lansing Large Format Compression Driver models 288, 290, 291, 299 etc.
      Small format compression drivers can also be used with the use of an adapter.
      Data Sheet: http://pdf.textfiles.com/manuals/STARINMANUALS/Bosch - EV/Archive/Altec/MRII 564.pdf
      Weight: 2.1kg each.
      Shipment: Will send interstate at purchasers expense, free delivery within Sydney.
      Pictures:




       

×
×
  • Create New...