External Crossover

On the advice of SVS I changed my setting on my subwoofers from 50 hertz to 63 hertz. In addition, I turned the volume up. The change opened up the soundstage, more detail, better /more defined bass. Not a night and day difference, but easily heard. Now I'm looking into purchasing a JL Audio CD-1.
Two questions:
1. Are there other external crossover units that I should consider?
2. Should I expect similar results as when I changed the low pass filter from 50 hertz to 63 hertz with the external crossover?
1. Bryston and DSPeaker.
2. Cannot say because I do not know your system or why this adjustment accomplished what you describe.
Do you intend to high pass your main speakers?

HSU http://www.hsuresearch.com/products/high-end-crossover.html

First Watt B4 http://www.firstwatt.com/b4.html
I use a Behringer DCX 2496 modded by Audiosmiles, over in the UK. Best $1k crossover you can get.
Bob and Cerrot,

Thanks for the response. I've already called HSU and left them a message. I will follow-up tomorrow.
IMO, the first question you need to figure out is whether you want to go analog or digital. Digital XOs offer many advantages, but some folks don't want to there. DSP of low frequencies (including digital room correction) offers IMO the opportunity for a huge improvement in sound, particularly for those using subwoofers who can also benefit from improved integration of sub and main speaker.
I talked to HSU today and they told me, "an electronic crossover would be of no benefit to my system due to the fact that I'm using a Integrated amp."
So your integrated does not provide preamp outputs AND main amp inputs. Thus, there is no way to insert an active crossover in front of the amp section. That's typical of integrated amps. There are a few on the market that offer the right inputs & outputs for integrating a sub, but not many.

That's why I asked originally if you intended on high passing the main speakers.

I have a Jeff Rowland Continuum S2 and it has 1 pair of balanced and unbalanced outputs. It has 2 pair of balanced and unbalanced inputs, as well as a bypass input. I told HSU what I had, he said he looked it up and adding an external crossover wouldn't benefit me. Maybe someone with more technical knowledge could explain why an external crossover wouldn't work with my integrated amp. My subwoofers are SVS SB13 Ultras.
It's not that an external crossover won't benefit you, it's that it can't be connected to your integrated amp. Most integrated amps, including the Rowland, do not provide both preamp outputs and main amp inputs. The Rowland has preamp outputs, but does not have main amp inputs. Basically, you need to be able to connect an external crossover between the preamp section and the amp section of the integrated. Thus, treating the integrated as separates. The Rowland does not provide this functionality.

For examples of integrated amps that do, look at Bryston and some NAD models.

See the connector labeled "POWER AMP IN" and the switch labeled "CONNECTED" and "SEPARATE". The Bryston integrated can be treated like separates.

Where the Bryston uses a switch to connect the preamp and amp sections, NAD uses a jumper.

The question remains, if you did not intend on high passing your speakers, then what's the point of using an external crossover?

Unfortunately, the majority of subs label their low pass filter control as a crossover. It's not. A crossover usually implies a combination of both a low pass filter and a high pass filter.

Your sub provides a high pass filter, see page 9 of the user manual. So you already own the functionality of an external crossover; it's built into your sub. But, you can't take advantage of it because of the limitation of your integrated amp.

First and foremost let me say thanks for taking your time to answer my post. My thoughts were an external crossover would provide more adjust-ability; thus making it easier to blend the subwoofer with the main speakers. So yes, my plan was to filter the lows totally out of the mains to prevent overlap...at least that's what I thought an external crossover would enable me to do. I knew my subwoofer has a low and high pass filter, but I thought an external crossover would provide more flexibility. Now I understand that I don't have the option of using an external crossover...thanks again!

You're welcome. You are correct in thinking that an external crossover would or could provide greater flexibility in setting the crossover point.

Since you've noticed an audible impact of changing the low pass filter setting in your sub, I would encourage you to download the bass test tones from the Real Traps web site and using an SPL meter see how well your main speakers are blending with the subs. You may get better results by setting the low pass filter on each sub to a different value.

Also, if you haven't seen it, you might want to scan the multi sub paper at the Harman web site.