Standard speakers measurements

[Jag768]

New to this forum (i'm sorry for the language, non-english speaker), have been reading for a while. Yesterday i ran some meassurements on the respons of the standard speakers. I'm not satisfied with the sound they're producing. I suspected a sharp peak in the respons at 3KHz, i thought it was coming from the (unfiltered) mid bass unit. I was proved otherwise.

Meassurement setup:
Edit: can't post links to the images

A little bit hard to see (i don't have screen shots from the meassurement program right now). The orange line in representing the respons from the woofer, meassured with door open. The blueish line represents the tweeter repons.
Edit: can't post links to the images

The mid bass unit is showing to be more a woofer than a mid bass, the respons droping sharply prematurely before 1Khz and break up modes showing at 3KHz. But the tweeter is the culprit for bad audio quality with a real rollercoaster respons. A peak of abut +8dB at 3KHz which is responsible for the disquieting midrange sound. And than a sharp peak around 15Khz which makes the treble less than smooth. I did apply some dampening material behind the mid bass extending the low end respons considerably and dampening the break up modes somewhat. But of course it doesn't fix the moderate quality of the tweeter.

I'm now considering whether to replace the speakers with a compo set or using a coaxial set of speakers. I think i'll do the latter, since reading this forum wasn't being encouraged disassembling the doorpanels and replacing the tweeters.

Edit: cannot post images unfortunately .

 

[Redemption]

Once you get to 15 posts you can upload images. The tweeter definitely sounds a little rough at times. Been thinking about disabling them on my Leon and just having my main Pioneers running.

I don't think there are any crossovers in place that I know of so maybe that might be causing some of the issues you hear/see.

 

[Jag768]

I thought about the option to raise the high pass frequency for the tweeter to 4 or 5KHz to "dampen" the peak at 3KHz. Only that would result in a gap between 1 and 3KHz.

I would really like to share the images of the measured respons, might be useful to others considering changing the standard speaker setup. I could also include a measurement showing the difference before and after applying dampening material. Could someone post them for me (pm me email, i will send the url's)?

 

[Redemption]

I don't have a Photobucket account (or any other for that matter) but hopefully someone else will be able to host them.

Seems I can't PM you either. Think there's a time limit or post limit for that as well.

 

[Jag768]

Edit: not relevant anymore

 

[Redemption]

Email sent.

 

[Redemption]

 

[robdf2]

The tweeters have in line caps , this is probably what you are hearing , i really dont think the door speakers were ever meant to be true woofers , mid bass sounds about right !
dont forget these are cheap philips speakers we are talking about here not audiophile quality !

the speakers wont handle anything more than 10 watts rms so it gives you an indication how cheap the speakers are.
i have upgraded my fronts with jl audion cs range speakers and now i have true bass.
you can squeeze 8" woofers in there with a bit of work but i have stuck with the standard 6.5".

what rta equipment is that?

 

[Jag768]

Well the respons of the woofers or mid bass drivers falls off at 1KHz (without low pass filter), that's why i called them woofers . They look very cheap! And i'm very curious which tweeter they used.

The software i use is Smaart Live, mostly used for pro audio applications. It calculates the transfer function with a different data window for each octave. I sent redemption new pictures showing screenshots of the transfer function of the woofer with and without dampening material behind it and of the tweeter as well.

I'm considering using a small (2") full range driver to supplement the woofer from 1KHz and above. Maybe use a gauge pod to attach it to the a-styles. Has anybody done that before?

 

[Redemption]