Ground Sound

In this gallery you’ll find some proto types / experiments of Tobias Lindell - Lindell Audio. Tobias is a studio/mix engineer and producer at Bohus Sound in Gothenburg Sweden. Tobias has made quite a lot of custom-made loudspeakers both for Home Entertainment and Studio use.

Latest project is a stereo power amplifier based upon Ground Sound SPA1000kit built in an exsisting box which were ment to be used for a power amplifier with this kit: Powersoft DigiMod 3000PFC

D-Power 3400 isn't correct anymore but the sound quality suits Tobias better...

Pretty neet inside

Neutrik gold XLR connectors in and a 4-pol SpeakOn / 4 pcs expensive Furutech binding posts out

Powered ON

An earlier project involves a Lindell Coolback powered by Ground Sound products
- DCN23, PA3CC, PSU8SA and TR600

After experimenting with the above active amplifier, but only as mono power amplifier versus a competitive
class D amplifier Tobias had this to say:
"I have listened to your power amplifier for a while. Has only used one channel full-range. It sound really great - open and fine highs. I like that processor/amps has so low noise floor.
I have measured the frequency response on the same tweeter (RAAL Ribbon) with X Class D amp and the Ground Sound amp and got different curves. PA3CC measures much better. I don’t know if the X Class D amp output filter cuts away the top? See plot:"

	<<<< Plot of the X Class D amp driving the RAAL Ribbon tweeter. I (Robert) guess that the output filter interacts with the tweeters internal transformer and maybe even input (or output) filter make the amplifier drop off a little bit early. All can be corrected with a digital crossover like DCN23 - but this doesn't make it easier... >>>> Plot of Ground Sound amplifier module PA3CC - nearly flat to beyond 20kHz

This “discovery” brought the next project along

– a power amplifier in a custom-made chassis from MODU with our SPA550 kit:

Two pictures of the Lindell amp

Those MODU chassis look excellent and they are perfect for DIY

A plate-amp with DCN23 and ColdAmp amp-modules/SMPS supply for tweeter + mid-rang
and compact PowerSoft amp/SMPS module 2x1000W/8Ω for bass

active@groundsound.com