2023 Mustang B&O

Works as should in a 2023 GT mustang coupe w/ B&O even though PAC and Crutchfield say it will not. Retains all OEM Head Unit functions and chimes/NAV etc. Plug and play no installation issues. PAC APH-FD01 Wiring Interface works with it too!!!

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Struggle Bus

I gave this 2 Stars. Simple to install and program with usb-pc and app, But It will not turn my amplifiers off, so it will drain my battery. Then the remote pin wire in the harness completely got pulled out. I ended up having to buy a fuse tap from the auto parts store to run a remote power line to my amps( Not Ideal) Reached out to PAC tech group and they are shipping me a replacement remote pin and wire for the harness but this will not fix the issue of the amps staying on. Bummer

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Easy install works great

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Unit work at integrating a audio control dsp and a mono block with retaining factory harness. Unfortunately unit failed at almost two years and support confirmed this with me.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Great item! Super recommended also for an extra $ get the PAC APA-TOS1. Excellent harness.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

worked great and was easy to add an amp to my system.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Great product and fast and easy installation!

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Meh.. Others are better.

Worked OK. Not as good as the Rockford Fosgate DDR1. You have to connect it to a PC to make adjustments. Needs to have bluetooth to do it wirelessly. It also mounts behind the radio so it makes things difficult to modify.

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Geat product

This made a tremendous difference in staging and cleaning up sound in my 17 Super Duty! Highly recommended!!

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Works as advertised. Retained all factory functions and I was able to integrate an aftermarket amp.

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Easy Install

This thing could not have been easier to install. It took me maybe 20 minutes.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Works great in my 2015 f350. Makes hooking up my amps to the stock stereo so easy!

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This thing is awesome, worth every PENNY!

Made taken factory ford sync3 to add aftermarket system. This thing is awesome

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

The premise of this product is very intuitive, and seems to be exactly what you would need if you're looking to bypass the factory Sony amplifier in a Ford vehicle. This is exactly what I used this AP4 for, and for the most part, it does what it is intended to do. The few things I do not like about it are that the subwoofer RCA outputs are not sensitive enough at low volumes. At anything less than volume 15, there is no signal being sent to the subwoofer amp even with the "bass control knob" all the way up, so I ended up bypassing this option and doing a line-out conversion from the factory subwoofer to get a better signal ratio at low volume. I did like the customization of the chime volume level, that is a nice feature, as well as being able to set the gain of the minimum volume.

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Amazing

This was a must in my Focus RS as the factory sony system did not meet my audio needs PAC / Crutchfield did an amazing job with installation instructions was practically plug and play was able to bypass the sony amp for amazing clean signal to an aftermarket amp

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2019 F350 - Not optimal

I installed this on a 2019 F350 with the B&O audio system and pushbutton start. Some 2019 F series have the optical cable, mine did not. If yours looks like picture 1, you can use the PAC AmpPro. Install requires removal of the factory radio which is simple enough. I stupidly bought a 6 channel RC line that was too short and had to run my cabling down the center of the truck which required removal of the center console. DON'T DO THIS! just but the right length patch cable. On my application I needed the remote wire also or my amp wouldn't completely turn off. (found this out the hard way so test first!) The PAC comes with a volume knob which I did not install but connected to make adjustments. It is initially set to minimum which defeats the signal to your amp so at least hook it up and test it first. Otherwise, do drama with this. All factory signals for the warnings, nav, and phone work exactly as they should and I got good signals to my amp. UPDATED 5/19/22: First one lasted two years; new one already has problems. Front fade/balance failed and on the new unit, if the OEM min volume is set to less than -10, the front signal disappears. Hours of trouble shooting to get this up and it's the weakest link in my system.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Critchfield has the best technology on the market and professional staff. Crutchfield knew exactly what I needed in my F-150 to install an after market Amp on my truck. Thank you and keep up the great work! Ed Tuccio

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

Great alternative to spending $1,000 to replace headunit!! I love it

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Works w/ Ford Flex Sony system

A wonderful product! Very happy to have found this. I can confirm that it does work in my 2013 For Flex w/ Sony system as well, despite not being listed. Made the install a breeze.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

The Amp pro works perfectly in my 2016 F-150 with the Sony system. easy to install.

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Great integration solution

I'm using this in my 2016 Ford Taurus SHO. Crutchfield says it's not compatible, but they are wrong. It works perfectly, and I expect it would work in a lot more Sync3 equippped Fords with the Sony system that Crutchfield and Pac say are not compatible. I had a feeling it would work because the ACM is the same from 2013 to present, and the APIM has the same pinout whether it's Sync3 or MyFordTouch. This module just piggybacks on those two modules, so it should work the same in anything with a Sony ACM and a Sync APIM. This thing is awesome compared to the piece of garbage Rockford Fosgate DSR1 I just sent back. My stereo actually sounds like it should, not all muddy and artificial like before, and the amp turn on, steering wheel controls, Sync prompts, backup sensors, etc all work properly. I used the optional optical output with a dedicated dsp, and there is no noise, so I can't speak to how it works stand alone noise wise.

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Noisy little bugger

If you're looking for a way to easily integrate an after market amp into your Sony system, this will do that. It does keep all the dings and Nav voice. What it adds is why it got 3 stars. Whenever I change songs it makes a weird noise sometimes, and this thing introduces some noise! I mean very very noticeable noise. I'm running Mosconi Zero amps, Focal BE and Illusion Audio Carbon speakers, all going into a Mosconi 8to12 Aerospace DSP. So I've got some nice equipment, and I was running it all on the Forscan Sony hack, but it has some weird problems, it would power on the amp through the RCA's, and sometimes it would pop when shutting off. So I thought why not try this. Well I went from an almost zero noise floor to some crazy hiss coming through my speakers, at first I thought maybe I got a bad unit, so I swapped it out a different one, still the same thing. This is all running over Stinger 9000 series RCA's, which are very high quality RCA's. The only thing that solved it was buying a good optical add-on cable. (Spending a lot on an optical cable isn't necessary, but you will audibly hear the difference). I went with Audioquest Carbon. After doing all that it sounds much better. My problem with it is I shouldn't have to buy an additional add on module, an optical cable, and reconfigure my whole system (optical cables require adjustments of amp gains) just to make this thing work as it should.

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PAC AmpPRO AP4-FD21 Aftermarket Amplifier Interface

I recommend the Amppro. I used it in 2013 F-150 and it works great. I also got the optional optical connection. System sounds are the right volume and the amps receive a clean signal.

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Just buy it!

Amazing product. Installed 3 of them so far for my clients with F-150's. If you have the chance to get the Optical Toslink output add-on module, do it! Your DSP will thank you. Can't recommend this unit enough.

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