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1,326 Posts
Discussion Starter #1
Product Brand & Model:

1. Helix P-DSP 8-channel DSP

2. 2 x Digital Designs S4 4-channel staggered output amp

3. Digital Designs M1a Monoblock subwoofer amp

4. Custom IS300 Kickpanels with Morel CDM-54 Dome Midranges

Condition of all items:

Everything owned from new and includes original boxes and manuals *except kick panels and speakers*.

1. As new other than a line in the screening of the word Germany (see pics). Was mounted in a glovebox its whole active life.

2a. The first amp is 10/10. Appears new.

2b. The second amp has a hex screw head break off (got in the way of mounting screw). Doesn't affect anything, there is another screw right next to it screwed into the heatsink. There are a few negligible marks on the bottom (pictured).

3. Appearance is 9.5/10. Two tiny marks on the heatsink. Had a pro repair done by Zed Audio a few years back (repair mute circuit, replace power block - will include repair invoice w/ amp).

4. Had the angled rings made professionally and mounted them to the stock kick panels. Mids are in perfect working order. The velcro strip on the driver side panel was to prevent any contact or rattling against the dead pedal.

Total Price: :

1. $350 shipped CONUS

2. $300+shipping for perfect amp, $275+shipping for slightly less than perfect amp

3. $200 shipped CONUS

4. $200 shipped CONUS

Shipping Terms: :

Will ship via USPS Priority. You can get a shipping estimate for the DD S4's using the following info: 20lb large package from 90001. Prefer to deal local and in person to avoid shipping hassles, so PM for local prices without payment processing and shipping.

Pictures: - Unless you are a Upgraded member, or your last 10 iTrader feedbacks are positive, you must post a picture of the exact item you are selling.

1) Helix P-DSP

2a) DD S4 #1

2b) DD S4 #2

3) DD M1a

4) IS300 Kickpanels/Morel CDM-54

Additional info:

Have a pair of US made JBL W12GTi Mk1 subs and other drivers coming soon!!!


Please be advised, all buyers and sellers are responsible for performing their own due diligence when considering any financial engagement. We recomend that you:

1) Check the iTrader feedback of the person you are dealing with on this site, as well as other car audio forums.
2) Ask for a name address and phone number. Call them and verify their info.
3) Valid e-mail address. Correspond before committing.
4) consider using an escrow service to protect yourself.

DO NOT proceed with a deal until you are completely satisfied with the other party.

DIYMobileAudio is not responsible for the outcome of any transaction on this site and will not moderate on your behalf.

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #2
Helix P-DSP Specs:

**Almost exactly the same as the current model Helix DSP from what I've gathered. Verify the differences if it has any bearing on your purchase decision.**

  • DSP settings and adjustmenets made via laptop or PC through USB port
  • download DSP PC-Tool Software from
  • 6 assignable inputs
  • inputs: 6 RCA preamp, 4 speaker-level, 1 optical SPDIF
  • 8 preamp outputs (4 volts)
  • channel settings can be separate or linked together
  • time alignment in 7 mm increments
  • 30-band graphic EQ with fine tuning
  • 1-band parametric EQ
  • adjustable high- and low-pass filters (20-20,480 Hz)
  • selectable slopes (6, 12, 18, 24, 30 dB/octave)
  • selectable filter characteristics
    • Butterworth: sharp transition, suitable for most applications
    • Bessel: gradual transition, suitable for smooth speakers, but not subs
    • Linkwitz: recommended for high-end speakers only, not subs
    • Chebyshev: very sharp transition, useful as high-pass for tweeters or low-pass for subs
    • Self-Define: selectable Q-Factor, 12 dB/octave slope only
  • adjustable Q-Factor in Self-Define mode (0.2-2.0) increases signal at crossover point
  • phase adjustment: switchable 0/180 degrees on front and rear channels, adjustable 0 to 360 degrees on sub channels in 22.5-degree increments
  • includes 57" USB cable
  • optional microSD memory card for saving and applying settings (sold separately)
  • plug and play input from select factory radios with EPC5 Easy Plug Cable and a Helix vehicle-specific harness (sold separately)
  • dimensions: 5-15/16"W x 1-11/16"H x 6-15/16"D

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #3
Digital Designs S4 specs:

The S4a is a non-symmetrical output, 4 channel power amplifier. It features two channels with 2 x 100 Watts of power, plus two channels with 2 x 200 watts of power. This allows the amp to make more power where it is needed most. The S4 can be configured to run a variety of systems.

The 100 x 2 channels have 24dB/oct high pass, variable from 20Hz - 500Hz. The crossover also uses a 10x frequency switch, this moves the crossover range to 200Hz to 5kHz. There are 4 calibrated dial markings to help frequency settings.

The 200 x 2 channel has the same 20-5kHz high pass and 50 - 5kHz low pass, 24dB/oct, with 10x frequency multiplier switch. Each filter has individual on/off switches for ultimate flexibility. A clipping indicator circuit is included to monitor real power conditions. The amp uses separate power supplies for each set of channels.

* 200 x 2 to power midrange door speakers with variable band pass, 2 x 100 to tweeters with variable high pass.
* 200 x 2 to power front component set or coax speakers, 2 x 100 to power rear fill.
* 100 x 2 to power front speakers, up to 700 mono to drive rear sub(s).
* 3 channel amp, 200 x 3 for surround sound use.
* 2 x 150 + 2 x 300 in 2 Ohm stereo use, to power double sets of coax/components.
* 2 x 175 + 2 x 350 in 1 ohm stereo use, to power more sets of coax/components.

With 3-way variable crossovers and two sets of bridgeable, staggered output channels, you can do anything a system design needs.

Series S
Input Sensitivity 0.2V - 8V
Variable High Pass Filter 20 Hz - 500 Hz (200 - 5 kHz) at 24dB/Oct
Variable Low Pass Filter 50 Hz - 500 Hz (500 - 5 kHz) at 24dB/Oct
Clipping Display LED
Tested Voltage 14.4
Tested THD 1%
Model S4
Cont Power at 4 ohm 100W x 2ch + 200W x 2ch
Cont Power at 2 ohm 150W x 2ch + 300W x 2ch
Damping Factor >550 @ 2 ohm

Cont Power at 4 ohm Mono
300W x 1ch + 600W x 1ch
Dynamic Power 400W x 1ch + 800W x 1ch
Efficiency thru Output >64%
Dimensions - mm 420L x 232W x 63.5H
Dimensions - inches 16.54L x 9.13W x 2.5H
Signal to Noise 95 dB
Shipping Weight 14lbs

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #4
Digital Designs M1a specs:

  • 1 ohm - 1200 RMS
  • 4 ohm - 300 RMS
  • Dynamic Power: 2300W x 1ch
  • 1% THD @ 14.4V
  • Efficiency thru Output: >75%
  • Signal to Noise: 85 dB

  • Input Sensitivity: 0.2V - 8V
  • Subsonic Filter: 10 Hz - 50 Hz at 24 dB/Oct
  • Variable Low Pass Filter: 20 Hz - 200 Hz at 24dB/Oct
  • LED Clipping Display

  • Dimensions - mm: 300 L x 235 W x 53.4 H
  • Dimensions - inches: 11.81 L x 9.25 W x 2.1 H
  • 12lbs

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #5
Morel CDM-54 Specs:

General characteristics
Type: midrange speakers;
Size: 10 cm (4 in.);
The number of bands: 1;
Power: 100 watts (maximum);
Sensitivity: 91 dB;
Frequency range: 450 - 7000 Hz;
Impedance: 4 Ohm;
Type: dome;
Mounting depth: 25 mm

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #11
Morels sold. If anyone wants the IS300 kickpanels sans drivers I'll send them to you for the cost of shipping.

Also of note: Those DD amps have LED clipping indicators, so to all you obsessed with setting gains with the assistance of a DMM or that Steve Meade clipping light thing, no need to bother with additional tools.

76 Posts
I'll take the IS kicks. Doing an sq instal now on my 2004 IS. I'll PM YOU.

"Look at it this way, you could have the clap... Your glass is now half full"

(((((((In Stereo)))))))
1,326 Posts
Discussion Starter #15
You're welcome. Please keep me posted on what you do with them. Here's how they looked in my car. Just came up on these pics.

I'll also be listing this pair of W12GTi MK1s for sale soon, as well as the baffle if any IS300 owner wants it.

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