KEF LSX II

[Dreamslayer]

I was planning on using a minidsp flex digital as input to Kef LSX plus two subs.



However I just realised subs don't often come with digital input so not sure how to make this work.



The lsx does have a 3.5mm aux input, would an RCA to aux adapter work here?



It would mean an extra ADC conversion but that probably won't make any difference.



Any suggestions on this?

The LSX all have bass management built in. What are you trying to accomplish?

 

[juliangst]

However I just realised subs don't often come with digital input so not sure how to make this work.

Just get a 20€ toslink DAC for your subs

 

[Blender]

Apparently the LT version uses a USB C cable to connect the secondary speaker to the primary one and this connection also carries power.
Looks like a much better deal than the normal LSX

I wonder how well this works. LSX has a 70w + a 30w = 100w per speaker. Is that USB-C cable really going to carry 100w from one to the other?

 

[Blender]

I wonder how well this works. LSX has a 70w + a 30w = 100w per speaker. Is that USB-C cable really going to carry 100w from one to the other?

“The supplied USB-C interspeaker cable is proprietary and designed to meet the safety and performance standards of LSX II LT. It cannot be used for device charging or data transmission. Using other cables except the supplied interspeaker cable or the C-Link interspeaker cable for the interspeaker connection is not recommended.”

 

[jhaider]

That green one would look so good if only it had a grille.

 

[Matias]

Lack of grill is a problem, I agree... I considered them for a simple system but the kids would go crazy pressing that awesome tangerine waveguide tweeter...

 

[juliangst]

I wonder how well this works. LSX has a 70w + a 30w = 100w per speaker. Is that USB-C cable really going to carry 100w from one to the other?

100W should be easy for USB-C. The next gen USB-C will even be capable of 240W of power delivery.

I also highly doubt that those drivers combined will handle anything near 100W before distortion heavily kicks in.
The LS50 Meta which Erin recently tested had 3%-10% distortion at the maximum voltage that he tested which was 11.27V (equivalent to 31.75W with a 4 ohm load).

 

[Paffi]

Apparently the LT version uses a USB C cable to connect the secondary speaker to the primary one and this connection also carries power.
Looks like a much better deal than the normal LSX

There is no analog in (aux), which may be a problem for someone.

 

[juliangst]

I might actually consider getting these LSX II LT.

I don't need high SPL at my 1-2m listening distance and the KEF app would allow to set a high pass filter which I currently can't do with my LS50 (non meta) and integrated amp setup.

Is this a good idea or am I missing something?

 

[bkdc]

Wish KEF would make a passive version. Consumer grade Active speakers break and passive speakers last decades except for blown drivers. If someone wants wireless a Sonos amp, Bluesound, WiiM amp or equivalent is just fine and far more flexible and probably more reliable

 

[equinox]

I went through two pairs of KEF LSXII and one PSB Alpha iQ and all the speakers had an audible hiss in near-field listening (still audible two meters away).
I love the connectivity of the KEF, PSB lacked the USB-C in but overall, that's exactly what i want in terms of connectivity.

In 2024 it seems really not that easy to get decent active speakers. I wanted to avoid using an amp and some desktop sized passive speakers.

 

[HeadDoc12]

There is no analog in (aux), which may be a problem for someone.

And no MQA, which will please almost everyone here!

 

[Peerke007]

Today arrived a pair of green LSX II at my home. Connecting and setup was easy. Firmware update took a little while (15-20 minutes or so).

They work great with the Kube 10b I already had. Almost tempted to go fully ASR and get rid of my little tube amp, almost . It is really a good combination. The wife even likes these little green ones better than the Italian design black veneres. Job well done KEF.

They will be used for desktop speakers soon, but first some more music .

 

[thewas]

 

[dfuller]

Everything is good but severely SPL limited. Multitone/IMD is only really controlled until 78dB/1m. This isn't surprising but it is to me indicative of why 2 way coaxial designs are a bit silly.

 

[thewas]

Everything is good but severely SPL limited. Multitone/IMD is only really controlled until 78dB/1m. This isn't surprising but it is to me indicative of why 2 way coaxial designs are a bit silly.

I cannot agree to such a generalisation, as this is a tiny example, larger ones like the LS50 or Q350 or Mofi 8/10 can play quite louder and even more if combined with a sub which can have even advantages compared to a conventional 2 or 3 way loudspeaker without subs system.

 

[Arnas]

Everything is good but severely SPL limited. Multitone/IMD is only really controlled until 78dB/1m. This isn't surprising but it is to me indicative of why 2 way coaxial designs are a bit silly.

These tiny Kef's makes no sense. Whitout 2 subs they are useless i imagine...

 

[Vacceo]

These tiny Kef's makes no sense. Whitout 2 subs they are useless i imagine...

They are great for small office/studio rooms.

 

[juliangst]

I also think they would work well on a desk or in a small living room setup.

I would also consider them but the lack of PEQ is a deal breaker for me.
A Wiim with a pair of KH80 DSP will be about the same size and price with way better objective performance; although not as good looking as the KEF

 

[Vacceo]

The LS series have very basic EQ in the app, which a shame, because that shows that KEF could include further PEQ customization just upgrading the software.