Input regarding the N110A

[Scooter]

I have been giving some thought as to how to proceed with the network that I am going to use with my L110s, and I decided on an "upgraded" N110A. Tentative plans call for Mundorf caps (not the Silvers--yet), 14 gauge air core inductors, and Eagle resistors. I have been advised to avoid low DCR inductors in the shunt portions of the mid and high sections of the x-over, as this will alter the circuits Q to a degree that can cause harshness in the tweeter. True? Is it better to stay with the original values in this section? Input appreciated.

Scott

[4313B]

N110A

I have been advised to avoid low DCR inductors in the shunt portions of the mid and high sections of the x-over, as this will alter the circuits Q to a degree that can cause harshness in the tweeter. True? Is it better to stay with the original values in this section? Input appreciated.

Actually it is mandatory that you maintain the original DCR values of these special inductors.

The DCR of L3 is ~ 7.5 ohms. L3 is actually an LR conjugate filter that reduces the effects of the LE5/subenclosure resonance characteristics.

The DCR of L4 is ~ 7.5 ohms. L4 (as part of the LCR conjugate circuit) reduces the effects of the resonance characteristics of the 066.

[4313B]

Impedance plots of LE5-9 in "standard" subenclosure with and without conjugate filters.

[4313B]

For those who might be interested -
The N110A network can be used in the 4313B system as is.
The N110A network can be used in the L96 system as long as the value of C5 is changed from 18 uF to 14 uF.
Some might like to explore the differences between the various networks, how they impact the performances of the systems.

[Scooter]

Thanks much Giskard. Glad I asked.

Do you know the wire gauge of the inductors mentioned? I have the N110, but not sure if the A version is the same. I need this info to get a cost estimate from Madisound.

Gratefully,

Scott

[4313B]

No, I don't know the gauge off hand, I'd have to go measure them.
I have quite a few of the 3.5 mH somewhere but very few of the 1.0 mH.
Here's the N110 schematic for comparison.

[scroogemcdov]

For those who might be interested -
The N110A network can be used in the 4313B system as is.
The N110A network can be used in the L96 system as long as the value of C5 is changed from 18 uF to 14 uF.
Some might like to explore the differences between the various networks, how they impact the performances of the systems.

Does this mean I can drop the 066 tweeters into my L110As?

[scroogemcdov]

I have been giving some thought as to how to proceed with the network that I am going to use with my L110s, and I decided on an "upgraded" N110A. Tentative plans call for Mundorf caps (not the Silvers--yet), 14 gauge air core inductors, and Eagle resistors. I have been advised to avoid low DCR inductors in the shunt portions of the mid and high sections of the x-over, as this will alter the circuits Q to a degree that can cause harshness in the tweeter. True? Is it better to stay with the original values in this section? Input appreciated.

Scott

Did you end up doing this? And how did it work out? I was planning on upgrading my L110a caps to the Mundorf MCap evo oil. Looking at the size of the caps modification to the XO may be needed.

For reference, the caps are:
18.068uF : 10uF + 8.2uF = 18.2uF
6.068uF : 5.6uF + 0.47uF = 6.07uF
18.068uF : we use 10uF + 8.2uF = 18.2uF
4.068uF : 3.9uF + 0.15 = 4.05uF
16.568uF : 15uF + 0.68uF = 15.68uF