OEM Speaker Details

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MdMa
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OEM Speaker Details

Postby MdMa » Mon Oct 07, 2013 9:32 pm

So recently "upgraded" my OEM (Alpine) HU to a Kenwood KMM-357SD so I can play FLAC.

I have gone through all the settings I understand but the sound just doesn't seem as good as it did with the OEM HU.

Now maybe it's just because the FLAC has more detail that the speakers can't resolve or the settings aren't correct.

Firstly, the Kenwood's specs:

Maximum Power 50W x 4
Output Power (DIN45324,+B=14.4v) 30W x 4
Preout Level 2500mV / 10kOhm,
Preout Impedance ≤ 600Ohm
Speaker Impedance 4Ohm ~ 8Ohm
AUX Frequency Response 20Hz ~ 20kHz (±1dB)
AUX Maximum Input Voltage 1200mV
AUX Input Impedance 10kOhm
Bass Tone Control 100Hz ±8dB
Middle Tone Control 1kHz ±8dB
Treble Tone Control 12.5kHz ±8dB

The Kenwood has settings for Bass, Mid and Treble "Level" which range from -8 to +8 (What does this mean?)
It also has (bold being the default setting which I have not touched):

Bass Center Frequency: 60/80/100/200
Bass Quality Factor: 1.00/1.25/1.50/2.00

Mid Center Frequency: 0.5K/1.0K/1.5K/2.0K
Mid Quality Factor: 0.75/1.00/1.25

Treble Center Frequency: 10.0K/12.5K/15.0K/17.5K

Can anyone help me make sense of this or do I need new speakers?
MY00 STi

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deejw
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Re: OEM Speaker Details

Postby deejw » Tue Oct 08, 2013 9:22 am

The OEM unit was alpine? Did not know that. I would ditch the Kenwood and get another Alpine unit. They have the best sound quality of all HU's that Ive tried.
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Lupin
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Re: OEM Speaker Details

Postby Lupin » Tue Oct 08, 2013 9:28 am

Is it fine at low volumes and gets worse as you increase it.
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MdMa
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Re: OEM Speaker Details

Postby MdMa » Tue Oct 08, 2013 6:19 pm

deejw wrote:The OEM unit was alpine? Did not know that. I would ditch the Kenwood and get another Alpine unit. They have the best sound quality of all HU's that Ive tried.


I'm obviously off my rocker... it's a Clarion DRX6275GV (30W x 4) to be exact.
I got this Kenwood because it has the ability to decode FLAC (from an SD card).

Lupin wrote:Is it fine at low volumes and gets worse as you increase it.


I can't say it gets worse, it's just that it sounds a little bright and not as bassy as my original HU (I have the same FLAC that I had made into an Audio CD).

I have adjusted the "level" of Bass, Mid and Treble ... I have both Mid and Treble at 0 and Bass at +2; maybe I need some more fiddling.

Would the Center Frequency and Quality Factor settings play a role?
I haven't touched them because I have absolutely no understanding of them.

Are they related to the speakers specs in anyway much like impedance?
MY00 STi

jonoe
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Re: OEM Speaker Details

Postby jonoe » Wed Oct 09, 2013 10:29 pm

The center frequency is related to the equaliser.
It highlights which frequency is adjusted when you alter your bass, mid and treble settings. If you are after deeper bass, you can try moving the bass center.

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Re: OEM Speaker Details

Postby jonoe » Wed Oct 09, 2013 10:36 pm

None of the settings will affect impedance, they are purely sound equalisation.

I assume quality factor is similar to alpine's media expander, which is used as a way of compensating for the loss of quality in highly compressed files.

All it does is boost your bass and treble.

If you are running flac files, you will have no need to use it.

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MdMa
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Re: OEM Speaker Details

Postby MdMa » Wed Oct 09, 2013 10:42 pm

I adjusted some of the "levels" today; knocked the treble from 0 to -1 and bass from +2 to +4, leaving mid at 0 and it's sounding pretty spot on.

I will play around with the center frequency of each to see if I can fine tune it a little more.

Thanks for the info jonoe!
MY00 STi

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Lupin
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Re: OEM Speaker Details

Postby Lupin » Wed Oct 09, 2013 11:22 pm

In simple terms.

Quality factor is the width of the curve. So a high q affects a smaller range of frequencies and a low q affect a wider range.

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Center frequency shifts the whole thing left and right
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