[bigdnno98]

Originally Posted by Billfitz

I don't know if it's high passed but it is EQ'd, which amounts to more or less the same thing. Measured nearfield my under seat woofers peak at 60Hz with a curve that looks like band pass, with a low frequency roll off below 60Hz steeper than the acoustic roll off of the speaker alone would explain. The only way to get a full band width signal to a sub amp is to capture it before it's processed by the stock amp. I don't know if the Technic harness does that. I'm not interested in a separate sub, it's not worth the bother with the classic rock I listen to, so I've never investigated the Technic beyond what I've seen posted here. If it is taking the signal post processing then it would have to be compensated for in the sub amp if it has that capability, or by a separate EQ placed before the sub amp input.

Bill,

The Kicker 47KEYLOC Smart Line-Out Converter claims to be able to detect and flatten any kind of input to something the amp can use. Do you think this is necessary when converting the Top Hifi signal to the JL amp for under seat and trunk subs?

https://www.crutchfield.com/S-IPX1yC...kaAkoOEALw_wcB

[Billfitz]

If I was adding an amp I'd also be adding a DSP EQ so that I could measure and tailor the system response.

[bigdnno98]

does anyone know if the wattage numbers floating around for the HK amp are RMS or peak?

[Billfitz]

I assume RMS, if it was peak it would be much higher. But it's impossible to be certain, definitive data seems to be non-existent.

[shiftdnb]

Originally Posted by Billfitz

If I was adding an amp I'd also be adding a DSP EQ so that I could measure and tailor the system response.

to piggy back off this. I have a Helix P Six DSP which is an Amp and DSP and can replace the stock amp and can recommend it. I worked with Musicar Northwest on a setup. They provided everything I needed including wiring up a harness to plug into the existing wiring and mounting it on a platform that matches the mounting space in the trunk. They have different options for speaker setups and what not if you want to upgrade there. It wasn't too hard tuning the DSP with a specialized mic and a xlr to usb adapter to a laptop you can plug into the Helix and fine tune the system.

[jjjccc]

Originally Posted by shiftdnb

to piggy back off this. I have a Helix P Six DSP which is an Amp and DSP and can replace the stock amp and can recommend it. I worked with Musicar Northwest on a setup. They provided everything I needed including wiring up a harness to plug into the existing wiring and mounting it on a platform that matches the mounting space in the trunk. They have different options for speaker setups and what not if you want to upgrade there. It wasn't too hard tuning the DSP with a specialized mic and a xlr to usb adapter to a laptop you can plug into the Helix and fine tune the system.

do u know where i can get a platform maybe wooden, to mount the xd600/6?

[jjjccc]

Originally Posted by Technic

This is the install of a XD600/6 in an F30 in 6 steps:

1) Wire HiFi harness to XD600/6 (Front CH1/2 at 175Hz HP, Rear CH3/4 at 175Hz HP, Woofers CH5/6 at 175Hz LP, Input mode to 4CH):



2) Remove OEM amp:



3) Ground connection:



4) XD6000/6 with pre-installed HiFi harness plugged into OEM amp harness:



5) Connect to battery (most F30 lack available distribution block slots):



6) Put trunk back to OEM and enjoy...

hey i got ur harness hifi676-hk674 for the xd600/6 for my 335i f30 with regular hifi non hk..
do i need to just unplug the 2 corner tweets and mid dash speaker when installing upgraded front door speakers?

[shiftdnb]

Originally Posted by jjjccc

do u know where i can get a platform maybe wooden, to mount the xd600/6?

not off hand, Northwest routered some pvc plastic to use with the existing mounting for the original amp.

[jjjccc]

when installin the XD600/6 on my regular hifi non HK system, do i unplug tweets and mid when upgrading front door speakers as i will not be using them with the xd600/6? or just hook up technics harness to the xd600/6 and good to go?

[f30_addict]

Hello guys,

I have F30 2012 with CIC HU and s676 option hifi. Frankly, I don't think the OE amplifier so bad enough to change it to a more expensive one, at least not in the first place.
When listening to this system in different modes and sources I can say with great confidence that the same music completely different when listening from USB (HI-res, mp3, doesn't matter) and from AUX with high quality source (in my case dedicated DAC AKM4376). What do you think about it? Is there technical information available on which DACs are used in different HUs?

I will also share my small experience with mid range loudspeakers "a la Bang Olufsen" from aliexpress. The price is very low. Sounds doubtful, but when I received and installed it I found that the sound is much better than OE s676 ones not to mention the base BMW sound system. If interesting, I'll share the link in direct.

[f30_addict]

Several pictures

[Billfitz]

I wouldn't count on those speakers being B&O. Anything that the Chinese can copy they will, including the sticker that's covering up a painted logo on the magnet. As for any difference in their sound in most cases that's due to confirmation bias. Actual measurements would be required to confirm it.

As to the OEM amps, they're not the problem. The lack of user adjustable DSP is. If one could add DSP to the OEM amp that would be great, but nobody makes one. That leaves an amp with DSP, or one that can be used with a DSP, as the best option.

[BavarianJeff]

HK sound is very good. Never understood chasing an audiophile level setup in a car. It’s never going to sound that great inside a metal enclosure.

[dangerus_car]

just curious, HI FI is a 7 channel system, and Harman Kardon is a 9 channel system. The difference between them is the 2 additional channel on the rear deck.

with that said, can a car with HI FI system buy a match 10 up DSP and retrofit the 2 rear deck so it come out as a HK system with the additional 2 channel while keeping everything look OEM?

Thanks

[S63JordanB44]

I’m struggling to understand what I need. At some point I do want to upgrade everything but in the meantime I just want to fix how whenever a song that fills out all the frequencies the low end suffers(almost like 200hz and less just ducks out) Why does this happen? I understand why it happens when producing, but not for audio equipment playing a mastered track. And then how do I fix it? Do I need the new amp? I’m not looking to add a trunk sub. Sorry if this has been answered I’m really struggling to understand.

[Billfitz]

You'll have to do a better job of describing what's happening with your system, whichever system that may be. Starting a new thread is probably a better idea than tagging on to one that's approaching zombie status.

[S63JordanB44]

I may, I just saw a lot of discussions in here about everything so I was kind of hoping to piggyback without starting one.
Basically the level of the subs gets squashed when a lot of frequencies are present. When there isn’t they are plenty loud. Same volume. HiFi system

[sufyaankapde]

Quick question guys. I have seen a video advising that the HK amp in the F20 can be used in the F30 plug and play without any coding. Does anyone know if this is correct or if the amplifier is different to the F20 and does require coding? Also has anyone been able to fit in the non optic cable amplifier in without coding on the F30?

[Billfitz]

Your quick question should be posted as a new thread, just as the person who last posted on this zombie thread should have.