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Case Study: Setting Crossovers

You’ll be reading about another example of client support. Shayne is a customer of mine from back when I was working at Easy Way Electronics of Langdon, ND. This is also a case study of how to use my forthcoming guide to setting crossovers on aftermarket head units and amplifiers.

Hello Barry,

I bought these from you years ago at Easy Way.  I ask cdt for help and they sent me to you. I’m hoping you can help me out.

I bought a CDT component system that I need some support in setting it up in a 2011 Tundra Crewmax.  Following is a list of my components:

  • MX-69S – Front doors
  • MX-2 Hybrid – Dash
  • MX-1i – Windshield corner (unless sail panels would be better)
  • MX-6X – Rear doors
  • MX-1000SX – Crossovers
  • Kenwood DDX-9705 – Head unit  (Has extra crossovers built in)  
  • Phoenix Gold Ti2 1600.5 – amp ( I have attached data below)
  • PG 10″ subs

Hopefully you can help,

You’ll be copying the installation I completed on this Tundra.

CDT Audio MX-Designs MX-3692 3-way 6x9 components
CDT Audio MX-Designs MX-3692 3-Way 6×9 Component Speakers
click or touch to view a Toyota Tundra installation

The rear doors were already upgraded and each of the 4 “corners” was powered by one amplifier channel.
The passive crossovers were placed under the driver’s seat.

I am wondering what settings to use on the crossovers, as well as the crossovers on the actual speakers themselves?

See the attached images for reference of MX-1000SX switch positions. You probably have the first generation of these crossovers which have some components moved. The switch functions didn’t change.

CDT Audio MX-1000SX 3-Way Flexible Passive Crossover

You will be bypassing the amplifier crossover settings. I’ll explain.

Kenwood DDX9705S Aftermarket Head Unit

The head unit will be set so the system type is 2-way. You need to see choices for Front, Rear, and Subwoofer when in the X’over menu.

Kenwood DDX9705S Xover speaker setup
Kenwood DDX9705S Xover speaker setup

What head unit and amp crossover settings should I use?

The head unit:

Kenwood DDX9705S DSP section setup
Kenwood DDX9705S DSP section setup

If you find the speakers are distorting as the volume is raised, or the doors will not stop vibrating, I recommend adjusting both the subwoofer LPF and FRONT speaker HPF crossover frequencies up by 10 Hz. Keep moving up until it sounds better. Better in my mind means the speakers are not popping when you have a loud song playing and you’ve got to shout for a passenger to understand you. These Tundras are known for noisy doors once good speakers are installed on high power, which you probably already know. I can help with door treatments if you need it.

If your doors don’t rattle or resonate you will then have the option of setting the Front HPF lower than the rear doors. As you have 6×9 midbass woofers that’s to be expected. We’re working with compromises and balancing the system.

The amplifier:

Phoenix Gold Ti2 1600.5 5-Channel Amplifier Input Controls

I’m not going to review everything on this panel. The highlighted controls are going to be discussed in the order of Front, Rear, then Sub.

Front HPF: This needs to be set lower than the frequency you choose in the Kenwood HU. There’s no need to use any special tools. As this knob has a range of 10 Hz to 4,000 Hz it will be difficult to be precise. Be sure the knob is turned fully to the left(counterclockwise) and then move it a small amount clockwise. If you do this with music playing, after setting the crossovers on the HU, you should just begin to notice low frequencies getting reduced as the front HPF knob is slowly turned clockwise. Back it off counterclockwise. 

The point of that is to have a backup HPF should your HU lose memory or be reset to factory defaults.

Rear:X-OVER switch is set to HP (high pass)This should disable the Rear LPF knob so disregard that. See Front HPF instructions above.As you do not need the same low frequency range out of the rear door speakers as the front doors you will not match the front HPF frequency. I see no need to drop below 80 Hz for the rear doors. As mentioned earlier, if you hear the speakers pop you need to move the rear HPF frequency higher. Do that on the HU.

Sub:L to R
Phase: Unlike the usual phase reversal setting, such as what your HU offers, this is fully adjustable between 0 and 180 degrees. To begin you will leave this knob turned fully counterclockwise to 0 degrees.

LPF: This is controlled mainly by the HU. To effectively bypass this setting turn the knob fully clockwise.

Subsonic: Two approaches.
1) If your subwoofers are sealed this will be turned fully counterclockwise to 10 Hz. 
2) If your subwoofers are ported you will multiply the port tuning frequency by 0.75. 

Example: 35 Hz port tuning frequency
35 x 0.75 = 26.25
Estimate the knob position to roughly 26 Hz. If you find the knob’s center position that is just to the left of center.

Can I tap into the factory speaker wire, or should I run new wire?  What gauge?

It’s so easy to run new wire all the way into the doors that you should do it. 16 AWG is sufficient. If you have 14 AWG that’s fine as well. No need to go larger, and don’t use 18 AWG or smaller.

Do I want to bridge the amp channels to the front stage and just use the rears as fill?  Or is that too much power?

No, do not bridge the amplifier. That is too much power.

If you made it to the end I applaud you. This is an intermediate or advanced topic of which most people will not even attempt. Leave your questions in the comments below.

Barry Schanz
Barry Schanz Enterprises, LLC
dba Rubyserv

Mastering Mobile Audio Systems Begins With a Plan

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