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Took awhile to finally post this. 
As with others posting about the factory Pioneer system (upgrade with sub) others have made comments about the lack of high frequency if any coming from the tweeters.
I took on the challenge to measure the output of the factory system, as I was in the audio business I have Pro measurement systems. Praxis,Sound Easy plus MLSSA. These acoustic measurement systems are some of the best of the best available.
I did some research and found the factory Pioneer upgrade system from GMC uses a speaker components (Mid woofer in the door and a tweeter in the window pillar) which is around 95db sensitive.
Understanding Loudspeaker Sensitivity http://www.goodsound.com/features/2008_02_01.htm
The challenge was to find a component speaker system which was close to this of the Pioneer GMC as possible,yet keep the cost down.
After looking around I found a dealer local who sells Hertz and the ESK 165 was in stock I had them install a set in the front speaker locations only.
I never had any other changes just replace the speakers. I can go on, as I am sure others will about using products like Dyna mat to dampen the doors.But I wanted to do this as a speaker swap ONLY.
A few things as this goes on.
I will show measurements of the factory Pioneer system as well as the HERTZ ESK 165.
This was able to be done because as the audio installation shop was changing out the speakers they allowed me into the shop with my measurement system to measure before and after installation.
This way people can see what happens just from changing the speakers out.
Note !!! If you are going to replace the speakers make sure you get a speaker set with at least 94db sensitivity.Understanding Loudspeaker Sensitivity http://www.goodsound.com/features/2008_02_01.htm
Yellow marker shows the higher frequency of the Pioneer factory speaker components, looses output after 2000hz.
89db output at 1000khz to 77db output at 10,000khz
Red marker shows Hertz upgraded component speaker has a over all lower out put (demands a higher volume setting from the tuner) over the stock pioneer system.BUT is over all smoother plus more upper frequency response.
83db output at 1000khz to 73db output at 10,000khz
These measurements were done with PRAXIS measurement system in the vehicle with the Mic not moving but left at the drivers right ear level.
This is measurements of a speaker design I use to sell (no longer in the audio business) called the APEX LCRi.
This measurement shows how smooth (flat) a proper designed speaker can look.Yes this is a home speaker but just wanted to show how measurements can look.
Moving the tweeter out of the pillar and onto the dash is a far better solution. MORE OUTPUT.
As shown I have since removed the HERTZ tweeters from the factory location and placed them on the dash.
In the next few weeks I will take some RTA (Real Time Analysis) measurements with more info on a location for the tweeters.
Over all a great improvement. Till I tear apart the doors and install damping material then redo the measurements.
As with others posting about the factory Pioneer system (upgrade with sub) others have made comments about the lack of high frequency if any coming from the tweeters.
I took on the challenge to measure the output of the factory system, as I was in the audio business I have Pro measurement systems. Praxis,Sound Easy plus MLSSA. These acoustic measurement systems are some of the best of the best available.
I did some research and found the factory Pioneer upgrade system from GMC uses a speaker components (Mid woofer in the door and a tweeter in the window pillar) which is around 95db sensitive.
Understanding Loudspeaker Sensitivity http://www.goodsound.com/features/2008_02_01.htm
The challenge was to find a component speaker system which was close to this of the Pioneer GMC as possible,yet keep the cost down.
After looking around I found a dealer local who sells Hertz and the ESK 165 was in stock I had them install a set in the front speaker locations only.



I never had any other changes just replace the speakers. I can go on, as I am sure others will about using products like Dyna mat to dampen the doors.But I wanted to do this as a speaker swap ONLY.



A few things as this goes on.
I will show measurements of the factory Pioneer system as well as the HERTZ ESK 165.
This was able to be done because as the audio installation shop was changing out the speakers they allowed me into the shop with my measurement system to measure before and after installation.
This way people can see what happens just from changing the speakers out.


Note !!! If you are going to replace the speakers make sure you get a speaker set with at least 94db sensitivity.Understanding Loudspeaker Sensitivity http://www.goodsound.com/features/2008_02_01.htm
Yellow marker shows the higher frequency of the Pioneer factory speaker components, looses output after 2000hz.
89db output at 1000khz to 77db output at 10,000khz
Red marker shows Hertz upgraded component speaker has a over all lower out put (demands a higher volume setting from the tuner) over the stock pioneer system.BUT is over all smoother plus more upper frequency response.
83db output at 1000khz to 73db output at 10,000khz


These measurements were done with PRAXIS measurement system in the vehicle with the Mic not moving but left at the drivers right ear level.
This is measurements of a speaker design I use to sell (no longer in the audio business) called the APEX LCRi.
This measurement shows how smooth (flat) a proper designed speaker can look.Yes this is a home speaker but just wanted to show how measurements can look.

Moving the tweeter out of the pillar and onto the dash is a far better solution. MORE OUTPUT.


As shown I have since removed the HERTZ tweeters from the factory location and placed them on the dash.
In the next few weeks I will take some RTA (Real Time Analysis) measurements with more info on a location for the tweeters.
Over all a great improvement. Till I tear apart the doors and install damping material then redo the measurements.
