4500x Network

[Deang]

Three sets out in the wild but this is the first set built by me.

Designed by Boxler for the K-55 (all variants) and SMAHL, using either the B&C DE120 or Celestion CDX1-1412. Will also work with CT120.

 

[geoff.27]

@Deang , do you have a schematic for this ? I cannot seem to find the one that used to be on here ?

Thanks,

 

[Deang]

Yeah, that thread was deleted. ¯\_(ツ)_/¯

I did the schematic in Visio, and it needs a couple of corrections. I will PM it to you when I get it cleaned up.

 

[lissenup]

I have 2 top sections for my k-horns (K55/K400/SMAHL/DE-120 on one top section, and the 18x10/PRV2200/SMAHL/DE-120 on the other top section) that I periodically swap out.

With the help of Boxler I made a set of the 4500x networks and use them when I am using the K55/K400 and SMAHL/DE-120 combination. Sound wonderful. Better than the universal networks I made.

 

[eclipsch]

I have LSIs, with AAs and SMAHLs, as the main speakers in my garage system and have always found the mids to be just a bit "shouty". When I built a set of Lascala clones this year with LMAHLs, I decided to build a set of the 4500x for them. I played around with the autoformer settings, and while they sounded great, it seemed like the mids were a little too muted (?). I decided to switch the crossovers for the 2 systems and, weirdly enough, there was big improvement in both systems. The LSIs are perfect with the 4500x and the clones like the AAs. I think lots of things could account for this: the space, different type capacitors, K400 vs K401, etc but it really doesn't matter to me since both systems are sounding great.

 

[mboxler]

I have LSIs, with AAs and SMAHLs, as the main speakers in my garage system and have always found the mids to be just a bit "shouty". When I built a set of Lascala clones this year with LMAHLs, I decided to build a set of the 4500x for them. I played around with the autoformer settings, and while they sounded great, it seemed like the mids were a little too muted (?). I decided to switch the crossovers for the 2 systems and, weirdly enough, there was big improvement in both systems. The LSIs are perfect with the 4500x and the clones like the AAs. I think lots of things could account for this: the space, different type capacitors, K400 vs K401, etc but it really doesn't matter to me since both systems are sounding great.

Interesting

 

[mboxler]

Crossover building is not for the faint of heart. I purchased generic PCB’s to see how they might help. The one on the left will be a second order cross woofer to autoformer. If it works out I’ll populate the right pcb to handle the low pass to the Squawker and the high pass to the tweeter.

 

[Deang]

This is my issue with giving out the schematic. It’s very easy to make a mistake, and troubleshooting network issues across the internet is just about impossible.

 

[mboxler]

I soldered the LF PCB and ran a sweep. My XXX-400/D2200ph combo were already installed so I hooked up to it. The white plot with the dip around 400hz was my first test. I reversed the squawker polarity and it flattened out. For the hard of hearing this almost looks good enough for a two-way.

Will start populating the HF next. Gotta cut a big trace to get it to work.

 

[Invidiosulus]

Looks like a fun build.

 

[eclipsch]

Looks like a fun build.

It is, and it was my 1st network build.

 

[Deang]

Pictures. We want pictures.

 

[eclipsch]

Pictures. We want pictures.

Not so beautiful like yours, but they work!

 

[mboxler]

Not so beautiful like yours, but they work!
View attachment 3300688

Did I forget to tell you that the resistor will probably melt the plastic strap around it?

 

[eclipsch]

Did I forget to tell you that the resistor will probably melt the plastic strap around it?

Thanks, I didn't know that. I guess I can attach with Goop.

 

[mboxler]

Thanks, I didn't know that. I guess I can attach with Goop.

It's better if it "hovers" at least half an inch above the board. I would cut the strap bend it upwards.

 

[eclipsch]

It's better if it "hovers" at least half an inch above the board. I would cut the strap bend it upwards.

Now hovering! Thanks!

 

[Invidiosulus]

That’s why Dean hangs the resistor between a pair of standoffs.

 

[Deang]

Most people never show their work. Bravo. Admirable first try.

The edges of those red Jantzens are conductive. Make sure they aren’t touching anything.

Couldn’t help but notice you’re on the full out setting. I removed that setting from my build.

 

[eclipsch]

Most people never show their work. Bravo. Admirable first try.

The edges of those red Jantzens are conductive. Make sure they aren’t touching anything.

Couldn’t help but notice you’re on the full out setting. I removed that setting from my build.

Thank you. I'll take another look again at the edges of the caps...particularly that one next to the barrier strip.
I started with full out, but am currently on the -2 tap.