Can the LS3/5a integrate seamlessly with a servo-controlled subwoofer?

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pankon

  • Jr. Member
  • Posts: 30
Good evening!

I am pretty new in this group, so I apologize if I ask questions already answered in the past.

I have a pair of Falcon LS3/5a speakers, which I listen to near-field (1m from the listening position and several meters from the rear wall). They image like crazy and simply disappear from the room.

I love those little monitors, but due to their shoe-box size, they lack bottom end. I have been thinking of adding a subwoofer (I had a couple of models in mind), until I stumbled upon the GR research servo-controlled subs. Unfortunately, the LS3/5a BBC monitors (like my Falcons) are notorious for their mid-bass bump. Here are Stereophiles’s measurements  https://www.stereophile.com/content/falcon-acoustics-ls35a-loudspeaker-measurements  Some say that the mid-bass bump makes a subwoofer integration impossible. I am wondering whether a subwoofer with PEQ might do the trick. But hi-fi purists claim that a DSP will just kill the fine details in the bass. I am no expert, so I do not know what to believe.  I have in-room measurements of my speakers, performed by an expert, which that might be helpful...

Looking for quality and not quantity of bass, I would like to find a way to improve my Falcons and not to compromise their character (they "live" above 70Hz). So...

1) Sealed box or Open baffle subwoofer?  i.e. Kit 2 or kit 4?
2) One or two subs?
3) High-level input on line input?

Are the servo-controlled amps of GR research supported by a mobile app for setting the subwoofer parameters?

Thanks in advance for any replies.

Panos
Greece

Tyson

Dual servo subs, use them as stands for the speakers in a stereo pair.  It won't take up any more floor space than what you are already using for stands.

Just let the main speakers run full range and bring the subs in underneath - you'll be very surprised how well this works.  There is literally nothing in the world cleaner or more musical than stereo servo sub bass.  You are in for a treat!

Line level has always sounded best to me.  Make sure to get the A370 amp as it has much higher impedance than the Hypex amps (important if you ever want to use/try a tubed preamp).


pankon

  • Jr. Member
  • Posts: 30
Dual servo subs, use them as stands for the speakers in a stereo pair.  It won't take up any more floor space than what you are already using for stands.

Just let the main speakers run full range and bring the subs in underneath - you'll be very surprised how well this works.  There is literally nothing in the world cleaner or more musical than stereo servo sub bass.  You are in for a treat!

Line level has always sounded best to me.  Make sure to get the A370 amp as it has much higher impedance than the Hypex amps (important if you ever want to use/try a tubed preamp).

Thanks for your reply, Tyson. I've noted your suggestion about using the subs as stands

Make I kindly remind you that I have my LS3/5a in a nearfield position, i.e. 1m from the listening spot? Can the subs work that close?

Are you suggesting closed boxed or open baffle subs. I guess it's probably the latter, right? Can you please let me know which GR kit you are suggesting? Kit 2 or Kit 4?

Of course I am using a tube power amp, namely a Lab12 Suono https://www.lab12.gr/suono, a SET with KT150 tubes.

By the way, out of curiosity, have you ever tried LS3/5a with servo subs, or are you assuming that the combination should work well?


Tyson

Thanks for your reply, Tyson. I've noted your suggestion about using the subs as stands

Make I kindly remind you that I have my LS3/5a in a nearfield position, i.e. 1m from the listening spot? Can the subs work that close?

Are you suggesting closed boxed or open baffle subs. I guess it's probably the latter, right? Can you please let me know which GR kit you are suggesting? Kit 2 or Kit 4?

Of course I am using a tube power amp, namely a Lab12 Suono https://www.lab12.gr/suono, a SET with KT150 tubes.

By the way, out of curiosity, have you ever tried LS3/5a with servo subs, or are you assuming that the combination should work well?

Kit 4 is the way to go for sure. 

Nice amp you have there.  I run tube amps exclusively in my system now, in fact I seem to have an alarming # of different tube amps in my collection now, haha. 

I run planar magnetic speakers on top of my servo subs and I listen nearfield frequently - it's as close to seamless as you can get with a sub, IME.  Please, please, please avoid box subs if you don't have to use them.  OB servo is much better for music.  Since the subs will only be playing up to 70 or 80hz, and they are going to be placed close to your main speakers, then the blending is not a problem at all. 

pankon

  • Jr. Member
  • Posts: 30
Yes, I quite like the Lab12 Suono amp. And that particular version of the Suono has a 16Ohm output, which goes well with my 15Ohm LS3/5a speakers. And I understand that the sub amp is 16Ohm. I do not know whether that might make the high-level connection of the Suono and the sub amp easier than with a 'normal' 8 Ohm amp.

Does the sub amp come with its own box, does it have to be mounted on the sub frame, or something else?

How would I be able to set the parameters for the sub? By ear? Is there a more reliable way to do it?

Thanks a lot.

Panos

Captainhemo

No mobile app for sub amp control.

We offer some pretty simple   amp boxes here   
https://www.audiocircle.com/index.php?topic=139480.0

jay

nickd

Quote
How would I be able to set the parameters for the sub? By ear? Is there a more reliable way to do it?

I use an amp with sophisticated DSP correction and available high and low pass digital crossovers. Honestly, it’s a great tool kit, but your ear is needed if you want great sound. Measuring is helpful, but the servo subs are an easy matchup with proper placement and a bit of fine tuning to get a good blend.

Not having remote volume is the only real downside. With mastering being all over the place these days, it would be nice to be able to bump the volume from my listing chair.

That said. There is no substitute for speed and low distortion. The better your system and monitors, the more you need the servo subs. The servo in the feedback loop of the amplifier is game changing. There is no direct comparison that I have heard.