GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Altec Model 19 in Boston.

Post Subject: I am a pain in ass.Posted by Romy the Cat on: 10/10/2011

It is over 2 weeks as the crossover parts for my Altec 21S modification are sitting in my house. It would be 30 min fix but I still did not do it – juts lazy. I want for how to keep the Altec low path crossover but I the crossover for MF I would like to put my own. Nothing exotic – 2 order around 500Hz. I will keep the woofer and MF overlap over one octave – I see no problem with it, well I see the problem since it is not time-aligned but in the speakers of limited demands (means for video applications) I feel it is perfectly acceptable.

I took 7mH air-core coil for filter of 19ga. I did not pay more for lower DCR coil as the coil in high path second order is not in series with signal, so the DCR is not so critical. For caps I took two pairs of 33mF/75V wet tantalum caps. They are not regular tantalum but wet and from my experiments during the Rohde & Schwarz modification I remember that I was not able to find anything better sounding. Of cause the polarized wet tantalum caps will not work properly in AC-only circuit, so I will bias them up with a few DC volts. I would need to attenuate the S2 driver, I guess for a few dBs and I still do not know how to do it properly.

The biggest problem with my Altec 21S is not to do the things but to properly delegate efforts to the level of result I expect. I think it think about my Altec 21S as it is Macondo and try to devise the ides to make it better. But in reality Altec 21S are way speakers for video room, the setup that has very limited requirements.

A friend of my who did not hear my Altec 21S asked me how would I estimate the Altec 21S sound on the scale of 10 if sound of Macondo to be at level 10. I said that as now Altec 21S would do 3 and I do not know if after all modification if will ever do higher than 4. It is not that it does not sound well, it is perfectly listenable, particularly since I put the S2 in there and bogie to get the sound that I use to. Still, being the “second system” I can’t defeat my hate of second systems generally and I need to make find encouragement improve something further in my Altec 21S.

Rgs, Romy the Cat

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