Helix P Six DSP

       This is not actually a teardown, just a first look into the future of car audio.

       It is a nearly all on one package which includes a DSP, six channels of full range class D amps and a bunch of upgradeable plug in modules for additional functions.

       I won't bore you with all the details but here is its product page. This page is for pics of the insides. Since this unit is not mine and due to limited time and tools, I was only able to remove the bottom plate to have a peek but I was allowed to share them here.

The box

Top of the amp. It is a nice simple design.

Removing the bottom plate, we see a nice clean layout. First thing I notice, where is the powersupply?

Output inductors for channels A-D. It is not clear which class D chipset they used as the main power semiconductors and control IC are underneath.

Output inductors for channels E-F. I'm not sure what the audio transformers are for but I'm guessing it is for either the aux in or the RCA line outputs.

A closer look and this is the powersupply. It does not use a conventional push-pull transformer but instead uses a boost converter. Because of this, the dsp/amp can use a wide supply voltage range of 10.5 to 32V battery input!

Audio signal processing block.

Input section has lots of jumpers for expansion modules? Op amps used are MC33078 and MC33079 audio op amps.

powersupply uses two LT3862 multiphase boost controllers and a few smaller buck supplies based on L5970D chips.

Inputs and basic controls side.

Power and speaker outputs.

       All speaker outputs are internally bridged hence they cannot be externally bridged for more power. Channels A and B appear to have a single BTL output per channel which is why it can only be used for 4 ohm loads. Channels C to F appear to have a similar chip but parallel-bridged to handle lower impedance 2 ohm loads. If driving only a single high power sub, It may be possible to sum-mono the last two channels and each drive a 2ohm voice coil of a dual 2ohm coil sub. Precise output level matching is a must if you plan to go that route.

       No sound quality tests yet as we did not have enough time. But for build quality and circuit topology, I say it has the potential.

Page created and copyright R.Quan ©15 Oct 2017.