Looking for an Altec 846A Valencia dividing network sch.

[HeathKitPat]

Those look familiar... Parts are ordered. Should start building, soon.

Can't wait to hear (from you) your results (only wish we could hear them through the forum). There is debate about this subject, but I believe they didn't really start to sound good until the capacitors settled in. After listening on and off for a day or two I swear the sound got better!

[TerryE]

Hi,

I can't find a source for the 25 Ohm L-Pad in this crossover diagram. Can someone recommend a place to buy it? I've tried Parts Express and Madisound. A part number would be great too.

Thanks in advance,

Terry

[LICORNE]

[HeathKitPat]

Hi,

I can't find a source for the 25 Ohm L-Pad in this crossover diagram. Can someone recommend a place to buy it? I've tried Parts Express and Madisound. A part number would be great too.

Thanks in advance,

Terry

The original design schematic doesn't use and Lpad. What you are looking at is a 25 ohm variable resistor. Parts express has a 16ohm Lpad #260-248 this is what I used in place of the variable resistor (potentiometer) that Altec Used.. if you look at the pictures I posted I also remote mounted my new crossovers so I drilled out the back of the cabinets to accomodate the Lpad mounts. IT was a nice clean installation that I was very happy with. Also I omitted the 20ohm R1 resistor.

- - - Updated - - -

The schematic for this crossover (N800K) appears to be designed for 8ohms.. it does however show the Lpad in place.

[TerryE]

HeathKitPat,

Got it. Thanks. I'm embarrassed to say that I thought an L-Pad was a simple variable resistor - so much for 4 years of an MIT education (I was a biology major!). After a little research based on your reply, I now see that I'm wrong. I had already ordered the same L-Pad you mentioned in your reply, so I should be good to go. Note that this L-Pad is 8 Ohms, not 16 Ohms as you mention in your post. Is 8 Ohms okay here? And, I will eliminate the 20 Ohm fixed load. Finally, you used a solid core conductor for L2 in the original schematic, and an open air conductor for L1, right?

Thanks again for your help.

Terry

[HeathKitPat]

Terry, your LPad should be 16ohm. I used a solid core inductor for L2, however were I to do it again I would go with air core. The iron core is more economical, however more chance of saturation.

[TerryE]

Thanks to HeathKitPat and everyone else who replied. The crossovers are now built and installed.

HeathKitPat - I've read of saturation of solid core inductors - what does the saturation sound like?

Thanks again,

Terry

[cradeldorf]

Terry, your LPad should be 16ohm. I used a solid core inductor for L2, however were I to do it again I would go with air core. The iron core is more economical, however more chance of saturation.

I preferred the iron core on the LF side, I felt it gave richer bass.