it just seems wrong to x-over that low. I am neutering the subwoofers. I could try it though. I do have another set of speakers that are nice but don't go as low. MB Quart QLS 1030. The receiver is a Pioneer LX805 so no Audessy, its Dirac or Mcacc. Look at the different sub responses on the dirac graph. Sub1 if front left and #2 is Right rear.
View attachment 78291View attachment 78292
as an aside I know the woofers were changed in the SC-IVA to get a more flat response down to 20hz. I have the Vifa woofers.
I appreciate all the help.
Sorry a delay in getting back to you, but I have been at the Mayo Clinic most of the day, getting ready for a major procedure in 1 week. I will fill members in about this next week.
Anyhow getting back to your problem. These images confirm what I have been saying.
First off, you have a massive null at the low frequency crossover point of your speakers and a poor response above.
Now, there is a common mistake and it is still prevalent on these forums that Subs handle the bass. That is totally untrue and wrong. They only handle a very small portion of the bass decade and actually by far the least important part. But dive into any forum and you would not get a hint of that very true fact.
So, as sub is the most dispensable speaker.
The bass decade essentially covers 20 Hz to 400 Hz, and the most important part for musical realism in the bass decade is from 100 Hz to 400 Hz.
If you just play a woofer below 400 Hz, any listener would identify it as bass, and would not even mention midrange.
Now this is the tricky part of speaker design, as this is the area where speakers transition from monopoles to omnidirectional radiators. This frequency is dependent on the width of the cabinet and the narrower the cabinet the higher the transition frequency. So the crossover has to allow for a 6 db per octave increase in output below the transition frequency. So a speaker with inadequate BSC sounds thin and bass deficient, which it is. However, this is also affected by positions and room boundaries. So I have a system in my active speakers where BSC is variable and can be set with the aid of measuring instruments and listneing.
Unfortunately your speakers with a 100 HZ crossover, present pretty much an insurmountable problem for your system.
That is another reason to keep crossovers above 400 Hz to bass drivers, as mids in general do not have the power reserve for the BSC.
Looking at what you have, I think any sub is going to be a downgrade to those speakers. Those speakers have an undeserved cult following, so will probably fetch decent money on the used market. I can not see how you can get the results you want with those main speakers.
What makes it even more senseless is that those woofers have an excellent response way above 100 Hz.
In summary you are not neutering the sub, but the subs are interfering with the main speakers and revealing the problem
I do not see any good solutions with main speakers that have the mains crossed at 100 Hz.
