Technical review CDT ES-02 MidTweeters (Wideband speakers)
Hello DIYMA members,
I would like to post this review and personal opinion which was done by my self on my daily ride.
It is fur sure not a speaker official test and it was done by me, an amateur and they were done in the car during normal listening mode showing “real life” measurements and results based on daily music listening.
Shall we begin then?
The Car – Toyota Avensis 2006 model and make.
The engine is a quiet (very quiet) 2.0 liter petrol engine and the tires are Dunlop DZ101 which are as well proving to be quiet tires (for which I see as the main noise introducer to the driving experience)
The car is sound proofed the following way:
Stinger road kill carpet all over the floor including trunk.
Butil sheets on all four doors, hood, trunk cover and trunk floor and side skirts.
Hoodliner covering the entire hood cover.
CCF (Dynaliner and other un-named brands) on all four doors both internal and external walls.
CCF on the entire trunk and trunk cover.
CCF on the entire a-pillars
System current setup (as the signature changes every now and then):
HU: Nexus 7 tablet + Sabre DAC
DSP: Audison BitOne
AMP: Zed Audio Leviathan modified due to being first generation.
Speakers: HAT L6v1 + CDT ES-02
Subwoofer: Digital Designs LE-08
Listening Test, measurements and methods:
Using an OBD scanner verified the overhaul electric system voltage and it was steady at 13volts motor at idle revs.
Using a DSO (Mini Scope) I’ve checked that I have no evident clipping at 60hz, 3500hz and 5000hz frequencies.
The DSO showed voltage on the ES-02 around the 600mv – not sure if I’ve done something wrong there to get this reading.
The test equipment is a MDSP UMIK-1 microphone and REW 5.0 free software on a S10e Lenovo notebook PC calibrated for the original OEM soundcard (which is rubbish)
The test was performed at two main stages:
1. RTA test done at 76 and then at 82 db using pink noise from 20hz to 20Khz
2. Sweep test 40hz to 20Khz
Further explanations and details regarding the tests:
The RTA phase was done while the nexus it self is running as the source entering the bit one showing the system real results.
The black line seen at the RTA shots is the internal voice card calibration of the laptop it self, it gives a very nice reference to how linear the RTA reading is on pink noise (after eq was done listening to my reference music) in conjunction to a fully straighten internal card calibration.
Take in mind that what you see is a result of tuning both on pink noise and selected frequencies only – which did not sound very well until tuned over daily listening reference music and that is what is shown.
The 82db readout is just to show how the reading is kept when the volume goes up.
The sweep test:
This test can be done only when the laptop it self is the HU that is entering the signal in to the DSP.
The difference between the internal volume measured to that of the UMIK had a big margin there for take in mind that at real life the echo and reverb reflected should be worse than what is shown.
What you will see are results of SPL and Phase showing the read in a deeper resolution than third octave.
A waterfall and a spectrogram overview.
Looking at the waterfall the xover point is clearly noticed at around 1.2Khz that is due to pod volume limits for the ES-02 and the best point after the L6 sounded worsen and mal performed.
Any attempt to set a different xover point or to straighten that pit ended up with a worse result, in order to fix that I need to change the volume the ES-02’s are seeing but for me that is good enough and it reveals the true
nature of these elements – I do believe I can provide an honest review about them, now that they are past the break in point and are tuned correctly.
As for the distortion – I would really like the experts opinion about this but for what I understand the THD line shows well below the fundamental and first harmonic readings as well must take in mind that there are other elements which might be vibrating in the car such as the rear sunshade, key chain etc.
Pictures from the tests: (readings and results)
SPL and Phase
RTA at 76db:
RTA at 82 db:
Personal thoughts and my review about the CDT Euro Sport 02
My last setup was based on the Hybrid Audio Legatia series L6+L4SE+L1R2 full kick panel install and now I moved to a 2way front active setup when most of the music is played above the dashboard.
The major differences are the overhaul system volume for which now has a much lower potential as I have gone from a 4.5inch mid and a tweeter to just a Mid-Tweeter widebander at total diameter of 2inches only.
But the fact that I had moved the focus from the kick panels to the dash area compromises that volume loss greatly, in fact the impression is that now the sound system is actually louder!
As for the “nature of sound” surprisingly it did not change much at all, the sound system is warm and yet still clear enough so that I can say that I do not lack the clearness of the ring radiators I’ve had before nor do I miss any other part of the spectrum.
The L1R2 were definitely clearer on the higher end than the CDTs yet I was never a highs loving person and the margin really isn’t that far apart.
But I am comparing apples with oranges as if the HATs would have been above dash I would have been blown away by them – I see them as by far superior potential.
Nevertheless, the CDT’s are more to my personal taste at sound and I prefer them at the moment as my daily choice.
They remind me greatly of the CDM54 I’ve had (Morel) but with the noticed addition of the high end as there is really no need to add a tweeter to the ES02 for basic listening.
If I really had to compare them as midranges I would for sure compare them with the Morel CDM line.
The positive side about them:
Considerably cheap to buy and provide great value for money – outstanding I may say.
Small diameter and depth – easy to install.
Very warm sounded and ear pleasing.
Surprisingly clean and detailed for elements which are best used as midranges.
Do not require much power, though they are seated on a Zed leviathan so…
The negative side about them:
They do operate better as midranges.
When used as a wide bender there is no escaping from full on axis install – some people do not like that the system build is not symmetrical for example so considered a down side in my view.
Diameter limited and therefore not as powerful as other midranges.
In order to play lower towards the 500hz or so the volume needs to be much greater than I’ve used – CDT recommend a volume of 0.1cf for sealed and 0.3cd for ported which is a lot in a standard vehicle.
According to CDT then can play down to 150hz – I would say not even in my biggest expectations would I even dare trying something like that with a 2 inch.
Technical specs and contents
• 1 pr 2” hybrid mid/tweeter driver
• Dome diameter: 2” (52mm)
• Frequency response: 200Hz-19.000Hz
• Sensitivity: 86.2dB
• Power handling w/xover: 90W-140Watt HP
• Magnet: Neodymium
• Voice coil: 1.0” (25mm)
• Surround: Rubber
• Frame: Cast aluminum
• Frame OD 2 11/16” (70mm)
• Mounting hole: 2 7/16”
• Mounting depth:1.26” (32mm)
• Cone: Fabric/paper carbon reinforced
• Impedance: 4 Ohm
• Cone surround: rubber
• Mounting depth: 1.26” (32mm)
A little bit about the reference music I’ve used to tune the system:
To test echo and reverb I usually like female voices that tend to get very loud based on their voice only for example “Ancora Qui” from Django sound track
And Souad Massi – Raoui (the thousand nights and a night story)
To tune the suboowfer against the midbass and as well phase setup between the mid-tweeter and the woofer I’ve used the famous Chinese drums poem (not this specific recording though)
A bit of electronic music that has some good guitars and bass in it:
It is absolutely brutal! O-Daiko by Kodo Japanese drums!
And finally multiple tracks played by Norah Jones… a little bit of metal tracks for distortion and several others.
I hope that this review is good enough to be considered accountable.
As well the build log I keep to update my system development can be seen here: