Book shelf speakers for SE tube.

[GM]

Originally Posted by chrisb

Certainly some folks have gone as far to to suspend the entire mass of driver from the magnet itself, and lightly gasket to the front baffle...........

Right, the best mount is one that doesn't connect to the box at all as the pioneers of audio concluded and used in early cinema woofer OB 'alpha' installs, but no doubt it was cost considerations that quickly converted them to flange mount when mass production began.

GM

[GM]

Originally Posted by M Gregg

If you were putting these speakers on a shelf or work surface,

What would you put under them?

It would depend on how rigid the work surface is. Shelving typically is quite flexible, so it takes considerable damping with the right amount usually being found empirically whereas on a very rigid surface such as a massive workbench that doesn't 'bounce' when a heavy weight is dropped on it, perching them on metal cones pointed end up will suffice.

Note that the speaker should have a metal disc interface for the cones: http://www.parts-express.com/wizards...e+sets&x=0&y=0

GM

[M Gregg]

More progress.

Just mounting the terminals.





Regards
M. Gregg

[M Gregg]

I just noticed the front pic is not so good,

So here is a closer view showing the side cut done with a hand saw and some stress,


Regards
M. Gregg

[M Gregg]

More progress,

I have completed the speakers and running them in as per Mark Audio instructions. However I have to keep stopping myself turning them up.LOL

They do sound very good even at very quiet listening levels. The thing that suprised me is I expected a Tinny sound probably because I link metal cones to tweeters! Well they are very mellow and sound stage is very good still at low levels. Bass even though I am trying to keep away from it at the moment seems very deep. I want to turn them up,just got to wait I suppose!

Interesting they seem to run well on the 8 Ohm output. I lined them with a layer of 10mm felt with a 20mm poly fluff on top of the felt. The brace is covered as Dave said on one side with polly fluff.

Picture of the lining before final tidy up!

I tried to get cat 5 cable solid core everything I cut open seemed to be stranded so I used very thin magnet wire (hopfully with a clean surface from the varnish coating). side by side half inch appart on masking tape topped with another layer back to back. Thoughts are paper type base of the tape does not give as much static as other tapes.

I will post a pick of the finished speakers when I bring myself to disconnect them from the amp.LOL

Regards
M. Gregg

[Bob Brines]

Originally Posted by M Gregg

I tried to get cat 5 cable solid core everything I cut open seemed to be stranded

I don't think that stranded CAT5 or CAT6 sounds any different from solid. If you are using Ethernet patch cords, they are always stranded for flexibility. Solid core CAT5 can be had at HD or Lowe's by the foot. My local Lowe's has PTFE coated CAT5.

I made a pair of speaker cables out of a Belden 25' CAT6 patch cord using all 8 wires -- solids to solids,stripes to stripes. Other than being a little harder to work with than solid wires, the stranded cables sound exactly the same as the 16ga zip cord I use as a standard.

Bob

[M Gregg]

Thank's for the info,

The sound is getting better and better.
The bass is also improving.
They have been running about 16Hrs so far.
Still got to wait I suppose.LOL

Regards
M. Gregg

[malibujeff]

M Gregg

Nice work!

[M Gregg]

This is an old thread,

I said I would post a pic of the finished Alpairs I never did so,

I run them off OTL and they sound great!

I can say after run in the bass is very deep sound is very good I would not be without them!

The sound isn't great on this recording its with a mobile phone (dosen't pick the bass up well) they are being driven with an (DIY OTL going through some mods for power increase at the moment)....This is repeat information used in another thread..

6C33C OTL power amp running two heaters on OP tubes.. - YouTube

All the best for the new year..

Thank's to Planet 10 for all the help!


Regards
M. Gregg