Advices on 10 mhz Clocks

I initially needed 4 ft cables, but after rearranging my gear, I have one 18 inch cable and one 4 ft cable.  I could get by with a 3ft cable instead of 4ft, but 2ft wouldn't be quite long enough.

I don't know of any reason to use the same cable length? 

@sls883 

Clock cables should be one meter and all the same length and identical models from the same manufacturer.

For economy cables try Shenzen Audio and Denafrips.

High end cables are $1k+

https://cybershaft.shop/

@lordmelton Thanks for the information.  Before I saw your post, I had already ordered a pair of 3 foot cables. I hadn't thought about it before today, but it makes sense that they should be the same length. 

@sls883 

No go for once blue to my tastes. However, I am glad you mentioned liking square wave best because it got me to try it again. With my brand new Townshend Allegri Reference mk2 100% passive preamp,  square wave seems to bring out some of the liveliness you lose with a passive pre over an active one. I love the incredible detail of the passive but it loses some of the forwardness of the sound. Square wave gives me that back. The sound got bigger. As always, EVERYTHING is always system dependent. What also got me to try it again is listening to vinyl. With an active pre I always kept my phono stage on 450 ohms for the Lyra Kleos. With the passive pre I also felt a bit of a loss in forwardness so I raised it to 520 ohms, et voila, same improvement. The key is to know your system inside out to be able to figure out the small details that can make big differences. If I don't get listening fatigue, I will keep it on square.

Wanted to thank you for giving me the idea of trying it again.

Very interesting that both of you are hearing more detail, so I did some digging to explore why that might be. It turns out that a perfect square wave is the sum of an infinite series of sine waves at the fundamental frequency and its odd harmonics. See the reference below. https://www.prosoundtraining.com/2010/03/13/square-waves-and-dc-content/  Mathematically, it can be expressed as:

Square wave (10 MHz) = Sum( n⋅sin(2π⋅(2n-1) ⋅ 10MHz) / (2n-1) ), n=1,…,inf

The higher the order of the harmonic frequencies, the sharper the edges of the square wave. These sharp edges more precisely define the timing information in a digital audio stream, which can lead to the perception of greater detail in the sound.