Rolls SX45 Review (Analog Crossover)

[Justruckin]

Would love to see the K231 tested but don’t want to be without mine for that long!

I just boxed my K231 up and will be sending it back tomorrow, it was like a wet blanket over my system. I really wanted to like it, and I expected it to be much better than the Rolls SX45. Nope, the Rolls SX45 bloodied the K231's nose, and cracked a rib or two. I'm listening to the Melody Gardot over a pair of Maggie LRS+ with a pair of REL T-Zero MKIII subs... Excuse me, but I need to go get Melody another glass of wine... ;-)

 

[Schollaudio]

Does anyone know what opamps the SX45 uses?

 

[MAB]

Does anyone know what opamps the SX45 uses?

It's in the manual:

https://www.parts-express.com/pedocs/manuals/245-1184-rolls-sx45-manual.pdf

RC4560 data sheet, product information and support | TI.com

TI’s RC4560 is a Dual, 36-V, 15-MHz, low noise (8-nV/√Hz) operational amplifier. Find parameters, ordering and quality information

www.ti.com

Does the op amp matter?

 

[Schollaudio]

It's in the manual:

https://www.parts-express.com/pedocs/manuals/245-1184-rolls-sx45-manual.pdf

View attachment 367974

RC4560 data sheet, product information and support | TI.com

TI’s RC4560 is a Dual, 36-V, 15-MHz, low noise (8-nV/√Hz) operational amplifier. Find parameters, ordering and quality information

www.ti.com

Does the op amp matter?

Thanks!! Looks like a basic design. Interesting how they work out the single rail by putting B+ on the positive input to the opamp. In this case I don't think the opamp will make a huge difference.

 

[MAB]

Thanks!! Looks like a basic design. Interesting how they work out the single rail by putting B+ on the positive input to the opamp. In this case I don't think the opamp will make a huge difference.

It certainly won't affect or fix the channel imbalance that was measured on the tested unit.
The basic performance of each channel alone is decent. The problem is the integrated product, not the ingredients.

 

[Schollaudio]

The imbalance is probably potentiometer tolerances.