In my x-over you will also get to choose which amp to attenuate....However, you will be using fixed resistors (way better than any pot) to do the padding. Also there will not be switches in the path to choose which amp gets padded. Everything will be done with push connectors that you can press wire or resistors in. This includes all the filter resistors. The B4 uses switches to change all the frequencies....these are in the signal path. There will also be on the board holes to solder world class resistors in instead of using the push connectors and also pads for world class surface mount resistors. My buffers are also Toshiba but I am using them single ended which will eliminate the resistors and pots that the B4 has on the output of his buffers.
The term "Vishay resistors" no longer means much. Years ago, before Vishay bought a bunch of companies....Vishay meant the bulk foil super expensive resistors....now, Vishay means almost anything. The "Vishay" resistors that are used in the B4 are generic and I am pretty sure not picked for sound. The Wima caps are great and I will be using those too but I will mark every cap for outside foil and orient them in the sonically best direction (to ground or output). The basic resistors I use will be better than generic Vishay and you can then substitute the worlds best resistors and either press them in to the connectors or solder them in (most tweak of all).
In order to have balanced you will have to buy two and use each one as a mono balanced x-over.
You really don't need an active xover with your speakers.....you need better speakers.....oh, oh I done did it...he he...The concept that Dunlavy used was great (six db per octave, time aligned, D-appolito, felting) but his drivers were just ordinary (also his cabinet construction). Today, the level of drivers in the mids and highs is way beyond those drivers (I played with them many years ago and even then they were not that great). I am glad you have at least upgraded the tweeter. If you used the Hawthorne AMTs with a couple of super efficient 10s and bi-amped them with my xover and then used your giant thangs as subs.....you would be in heaven. The Hawthorne AMT goes to 700hz is 97 db efficient and is dipole....just sit it on top of the cabinet and time align (and isolate). I am sure your super modded speakers are fantastic (not to mention, you spent a lot of money on x-over parts). So, new speakers are probably not on your table....just sayin'... I guess I am just excited about what bi-amping using my new Class A amps and these AMTs can do....I cannot wait!
The term "Vishay resistors" no longer means much. Years ago, before Vishay bought a bunch of companies....Vishay meant the bulk foil super expensive resistors....now, Vishay means almost anything. The "Vishay" resistors that are used in the B4 are generic and I am pretty sure not picked for sound. The Wima caps are great and I will be using those too but I will mark every cap for outside foil and orient them in the sonically best direction (to ground or output). The basic resistors I use will be better than generic Vishay and you can then substitute the worlds best resistors and either press them in to the connectors or solder them in (most tweak of all).
In order to have balanced you will have to buy two and use each one as a mono balanced x-over.
You really don't need an active xover with your speakers.....you need better speakers.....oh, oh I done did it...he he...The concept that Dunlavy used was great (six db per octave, time aligned, D-appolito, felting) but his drivers were just ordinary (also his cabinet construction). Today, the level of drivers in the mids and highs is way beyond those drivers (I played with them many years ago and even then they were not that great). I am glad you have at least upgraded the tweeter. If you used the Hawthorne AMTs with a couple of super efficient 10s and bi-amped them with my xover and then used your giant thangs as subs.....you would be in heaven. The Hawthorne AMT goes to 700hz is 97 db efficient and is dipole....just sit it on top of the cabinet and time align (and isolate). I am sure your super modded speakers are fantastic (not to mention, you spent a lot of money on x-over parts). So, new speakers are probably not on your table....just sayin'... I guess I am just excited about what bi-amping using my new Class A amps and these AMTs can do....I cannot wait!