[Advent Heritage Xover upgrade produces too much treble]

On 8/31/2018 at 11:53 PM, Doug G. said:

I think this is a good example of users, out in the field, changing things around in a speaker without considering the original design or why certain components are in a speaker. I realize cost is often a major factor in speaker design and construction but, the thing is, the components in a speaker ARE the components in the speaker and if you go changing them, you may well alter the sound but not necessarily for the better.

Doug

If "everyday" people understood the thought process behind product development, they would be amazed. In some cases, the design is strictly driven by cost, which will yield a certain sound. 

In my case, I have the tools to measure changes and decide if the change is right for me. I didn't tell everyone this was an upgrade and to modify all Heritage speakers per my changes. In any audio forum, you have to do your due diligence and decide if you want to change  or modify your gear based on other members who have posted any type of changes or modifications to said equipment. 

I am a member of all the popular forums, but rarely post because the egos and mania are just too much to handle most times. 

[Advent Heritage Xover upgrade produces too much treble]

On 8/24/2018 at 9:10 AM, Pete B said:

@THD+N   How did you measure the inductor saturation?

Pete,

No scientific (or "real") test was performed to determine the inductor saturation, but you could hear it saturating. Bass got flabby and distorted much too early before power handling was an issue.

 

In another life, I previously worked at Recoton and Audiovox (1997 to 2015), who owned the Advent and AR brand names. I worked closely with the engineers who designed and developed the later Advent and AR speakers. I designed and developed car audio. The Advent brand was price sensitive (from a production standpoint) and it showed in some products. Simple crossovers with small inductors that would just allow the woofers to handle the rated power, cheap (no brand name) capacitors, etc.

 

Although the Advent Heritage was made prior to my employment at the company, if the bean counters would have spared an extra dollar or so, the Heritage crossover would have been respectable.

[Advent Heritage Xover upgrade produces too much treble]

Here are the complete crossover component values for the Advent Heritage (Classic Heritage, twin woofer). I originally only replaced the caps, but then discovered at higher volumes, the iron core inductors were saturating. I replaced the woofer inductors with Erse iron core inductors and the saturation issue was resolved.

I also replaced the tweeter inductor with an air core type.

I used DATS 2 to make the measurements.

Advent Heritage Crossover Values_062618.pdf