Another Practical Use for YouTube

In this case it is the addition of R5 and R6.  This decreases the "16" ohms of the 2251 to ~13.8 ohms, changing its high end roll-off.

Similarly R1s work with the 2241 to reduce its "Q".

Rather than trying to make the room match the venue, I recognize that's not going to happen in such a large area and I try to bring the venue into the room by tuning the speakers for the room, in the room.  This has taken years of listening with countless crossover changes.  Goes a whole lot further than fancy gizmos and do-hickies.

Oh, BTW, these were built using Craigs List and eBay parts at a cost of less than $1,500 for the pair of speakers.  I could spent 50 times that for a pair of high end speakers, and they still wouldn't be tuned for the room.

Great job! Usually people don’t tune speakers for a particular room. It’s done the other way around: they change the room acoustic to fit the speaker. Not many of us have the knowledge to do what you did. Commercially, it would be impractical since the speaker manufacturer doesn’t know our room and would need to adjust the speakers ever time we move. More power to you. Have you thought of measuring the frequency response with something like REW?

I have a Behringer DEQ 2496 61-band RTA that I use in tuning, but the ear gets the final say.  Seems like the mic is never exactly where my ears are and I primarily use it for near field measurements when determining what a part change is doing at the speaker.

Also, because the Behringer's pink noise is mono, you can only do one channel at a time.  Anyone who tries to use a mono pink noise signal on both channels simultaneously is engaged in an exercise in futility. 

Let me get this straight.  You recorded two different times with the speakers in two different locations, and you think your $3 resistor is responsible for the change in sound?

There have been several other changes to the crossovers over the years between the two videos.

For instance, Audyn caps were replaced by the Spragues because I prefer their sound, and they are not so rough/edgy.

But it was the addition of R5 and R6 that changed the slope and removed the resonance.  The speakers had been changed in position long before the resistors were added and the resonance remained.

Looking at the time frame when the video was first made, the crossover was probably of a configuration like this:

Here is a cut prior to the installation of R5/R6.  Again, YouTube to the rescue.

https://youtu.be/s0DoPF2yP3M