Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Car Audio and Multimedia

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-03-2003, 08:37 AM
DaimlerChrysler's Avatar
Registered User
 
Join Date: Mar 2002
Location: Lexington, Kentucky
Posts: 132
Unhappy Got the MB Quarts..what next?

Okay, I bought 2 MB Quart DKD 110's and put them in my 84 380SL.
(I have a JVC CD head that says "180 watts High Power" on the face plate....it came with the car so there's no owners manual). The sound is wonderful at low volume levels, but if you turn it up loud enough to hear it with the top down they distort. One of my students who works at Circuit City says that I need an external amp because the receiver doesn't have enough power to operate at the volume I need. When I told him about the "180 watts and high power" he laughed and said that I should take the number, divide it by 4 then divide it by 10 and that's probably what the receiver REALLY puts out. (4.5 watts).

Does that make sense to anyone???? Do I REALLY need an external amp???What kind should I get? I listen to mostly classical music (I'm a music teacher!) and I'm not concerned about breaking glass with the bass!


Thanks!
__________________
Old age and treachery will allways overcome youth and skill!

1993 S500
1984 380SL
Reply With Quote
  #2  
Old 06-03-2003, 03:50 PM
Zeus's Avatar
Moderating, Eh?
 
Join Date: Feb 2000
Location: Canada
Posts: 1,774
The 180 watts power rating is a joke. The marketing behind car stereo head units has become ridiculous to the point of being fraudulent.

My home stereo amp - a Marantz 1180DC - produces 90 watts per channel into 8 ohms with less then 0.03% THD (total harmonic distortion). It weighs about 50 lbs. Most of this weight comes from the power transformers. The power transformers step up the voltage to provide more power. The capacitors are also massive. Capacitors store power for when it is needed. You head unit probably puts out between 7-10 watts/channel at a reasonable THD rate. (I don't know your exact model).

How much does your head unit weigh?

The reality is that the small head units on their own do not usually have power transformers in them and have to rely on the 12V of power you provide them from your battery. That 180 watts is likely a peak measurement and not a more meaningful measurement (RMS). Your head unit is likely closer to 90 watts RMS (being generous), hence about 22 watts/channel RMS. This alone is not enough, the power rating must be measured alongside the total distortion being produced and into what load (resistance, measured in ohms). If the amp produces power that is distorted, then it will sound bad and it's not great for your speakers. This is what you are hearing when you crank it up and it sounds crappy. Is the unit capable of creating more volume? Yes. Does it sound good? No, because it is distorting. Why? It can't produce enough clean, continuous power for the load it is connected to (your speakers) at the level you are driving it at - the volume.

The bottom line is that if you want louder, undistorted sound coming out of your speakers, you will require an external power amp. The external amp will have a power transformer in it which will step up your voltage and allow more power to be sent to the speakers. This will produce a louder volume without distortion.

The efficiency of your speakers also plays a big role in the sound. The more efficient the speaker, the less power it requires to produce sound. Generally, you want the efficiency rating to be higher. If the rating is say, 88, it usually means that the speaker will produce 88dB of sound at a distance of 1 meter from an input power of 1 watt. The higher the efficiency, the less power you need to provide the speakers with to make sound. I would assume your MB quarts are quite efficient speakers. If you add a good external amp, they'll sound great.

I'll let someone else deal with the amp recommendation, I haven't bought one in a while! If I've fooked up any of my explanations here (quite possible as I'm working as I do this) please correct me!

Good luck.
__________________
Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired


"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
Reply With Quote
  #3  
Old 06-04-2003, 07:45 AM
DaimlerChrysler's Avatar
Registered User
 
Join Date: Mar 2002
Location: Lexington, Kentucky
Posts: 132
Thanks for explaining it! I appreciate your response!
__________________
Old age and treachery will allways overcome youth and skill!

1993 S500
1984 380SL
Reply With Quote
  #4  
Old 06-04-2003, 12:36 PM
Registered User
 
Join Date: Jan 2003
Location: Epsom Downs, England
Posts: 152
DaimlerChrysler,

Your mechanic is right, with 12V form the battery and 4 ohm speakers, the most power you can get (without bridging) is 4.5 watts RMS. Any other figures are porkies.......

Unlikely to start any earthquakes
__________________
Paul Gibbons
'93 320CE
'73 Jensen Interceptor (Resting)
Giant Full Sus Mountain Bike
Reply With Quote
  #5  
Old 06-04-2003, 10:05 PM
Registered User
 
Join Date: Mar 2003
Location: Milwaukee Wisconsin
Posts: 1,150
Anybody here remember the vibrator? No not that. How do you think they got the hundreds of volts required to run the tube type radios in those old cars with 6 volt systems?

Modern quality head units may use switching power supplies to do what the vibrators did. That is, step up the voltage of the power supply and thereby substantially increase the power output of the unit. True some power output claims are highly exagerated, but head units with true 30 watts RMS per channel into 2 ohms are available. Tod
__________________
Resistance is Futile.
Reply With Quote
  #6  
Old 06-06-2003, 07:43 AM
JPL's Avatar
JPL JPL is offline
Its All Within Yourself
 
Join Date: Jun 2001
Location: Philadelphia, PA
Posts: 249
Your next move, I think, should be an external amp in the trunk.

If you want to get more bass, go for a subwoofer mounted in the trunk below the deck and using either the first aid kit or the utility bin opening as a port.

I faced the same issue you are facing. I got mb quarts all around (4x6 in my case) and a Clarion amp. I realize the name clarion may wrinkle some foreheads, but they've come a long way in the past few years. Also, I had to think about the speakers I was driving (4x6) I didnt need a super expensive ultra efficient amp to drive 4 of these modestly sized speakers. So that configuration provides clean clear upper-mid range frequencies. Now the bass was adimitedly lacking. To get those low frequencies I use an Infinity Basslink Powered Sub.

I listen to music of all kinds, but mostly classic jazz, swing, and classical. I am very happy with the sound this all provides. I dont know how much you want to spend, but this was all done for around $650 P&L.

Poke around the forum here for lots of advice on components.

Have fun, and listen often.
__________________
James

85 300SD 285k
Charcoal Gray/Grey MB-Tex

79 300CD 142000mi "Rabenshwarz"
Black / Black MB-Tex, Burlwood Int. TOTALLED - 10/24/02 --
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:29 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page