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|30th March 2009, 23:56||#16|
A few more doubts:
1. The HU as well as amps have built-in crossovers. Which one is preferable?
2. This one may sound a bit crazy- Is there any way to find out fundamental resonance frequency of the cabin (i.e. the lowest resonance) without needing professional tools (or the ones that may be available with a good installer)? I have to anyway get a suitable sub-box made, therefore if there is any opportunity to tune it, I would be willing to do that.
3. How much do I expect TS parameters of the sub to deviate from specs (specifically Qts, Vas and Fs)?
|31st March 2009, 00:42||#17|
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What are the crossover features in the HU. If you have different freq available then HU else go for the crossover in the amps..
Need not go for the car cabin freq as you are going to put it in the boot....What are the specs post it here can suggest you a appropriate enclosure volume for the same...
They will be quite close when the sub has run-in.
|31st March 2009, 03:00||#19|
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2. fundamental resonance freq of a cabin is a complex question but it need not be answered because what you need to compensate for more is things like road noise, reflections from the glass surfances and such. Due to all of this the cabin's transfer function is not as simple as most living rooms.
3. typical deviations can be +/- 10% from published specs of good companies. the published specs of lesser companies are not worth the paper they are printed on. a 10% deviation can be massive. This is one more reason to prefer sealed boxes over ported.
|31st March 2009, 18:11||#20|
Sorry for the late response.
Here are details on crossovers-
2-ch amp: HPF 40-200Hz variable @-12db slope
Mono amp: LPF 50-200Hz variable @-24db, subsonic off, 15, 25Hz @-18db
In "normal" mode: off, 50Hz, 80Hz and 125Hz for both HPF and LPF. Couldn't find out the slope in this mode, but I guess it should be equal for both filters.
In 3-way mode, I can use HI and SUB (ignoring MID) and vary LPF/HPF frequencies anywhere from 25Hz-10KHz, and set slopes to -6, -12 and -18db. Normal/Reverse phase is also supported in this mode.
The speaker's freq response is mentioned as 65Hz-20KHz, but 160W RMS is specifically for 100Hz HPF! I think common setting around 80Hz should be safe (can sub be usually located at this setting? hope not.).
HU gives more control, but as Navin mentioned, it may be quite dangerous in case it is set to flat after battery disconnections (in normal mode, default is flat indeed for his HU)
Regarding the cabin frequency, all I am trying to explore is whether I can fine tune the box volume as per this recommendation mentioned by me earlier somewhere:
CDTAUDIO Premium Car Audio Sound Systems
(Basically, trying to make Fb=resonance freq. while keeping Qb in between 0.7-0.8)
One method that I know of is to measure longest internal dimension and get a rough idea of the resonance. Based on that, it comes out to be close to 66Hz (firewall to parcel tray/shield) and 55Hz (firewall to rear number plate). Cabin is far from a rigid rectangular box, so if there was any way to measure it like they do for Fs of woofers, it would be better I thought.
By default, I would make the box volume = 0.7 cu. ft. as in following plots. It is not explicitly mentioned but I believe it corresponds to 66Hz typical car (based on other plots on their site).
And yes, I am not considering anything other than sealed box, for multiple well known reasons.
|17th April 2009, 03:34||#21|
Received all my stuff safe and sound
Customs did give my friends a tough time in an attempt to extract some money, but they managed to get away without paying a single penny.
First impression is that build quality of all items is good. To keep up the tradition of ICE section, attaching a few product snaps (pardon me for not-so-good photo quality, because all were taken at night time).
The HU has one of the wires described as "OrangelWhite wire (Illumination lead).... Connect it to the car power supply terminal lor illumination."
What is that?
Amps, Sub and Bluetooth kit shipments (kit was unpacked before traveling)
Don't go by sizes and what is written on those boxes, sellers have used extra packing like this
Original manufacturer's packings
Nokia CK20W Bluetooth car kit
2-Channel amp- this one is bigger and heavier than what I expected.
ClassD mono amp
The subwoofer- It has solid cast basket, poly-fiber cone with rubber surround. Magnet/Motor assembly is not much in depth but it is wide in diameter, with a cooling vent.
Much talked about Clarion head unit
What is this "silica gel" and what is it used for?
6.5" Component set
Mid with carbon treated paper cone/rubber surround
Stamped steel basket, it has deep folds that make it firm I believe
So called "phase perfect, elliptical" cross-over
It supports CDT's "upstage" tweeters as well (though I don't really plan to use any)
1" silk dome tweeter. Hardware for flush, angle, surface mount is provided, but swivel mounting doesn't seem to be possible.
Everything awaiting a nice install! But I am occupied these days
|17th April 2009, 10:16||#23|
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so finally you stuff landed,the built quality of cdt is really goof hope will sound as good.
when are you installing them,do click pics during the installation.
|17th April 2009, 10:49||#24|
Join Date: Mar 2009
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Well the stuff looks sweet and i hope it sounds much much more sweeter ;D
Waiting for the installation , hope it comes soon . And man i wish i had those CDT components .
How did u manage so much weight ?? Paid extra for over weight ??
|17th April 2009, 11:38||#26|
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Join Date: Sep 2006
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Sweet! Very nice equipment there! I'm sure you're itching to get it all fitted up Looking forward to some reviews on the CDT speakers.
OT: Could you please share what the Clarion HU box dimensions are?
Last edited by razor4077 : 17th April 2009 at 11:39.
|17th April 2009, 13:59||#27|
Yes, I am eager to get it installed as soon as possible, but the fact is that I don't know when it will happen! Will definitely post install pictures.
|17th April 2009, 14:10||#28|
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Congrats, Santosh! The gear finally got here without problems, huh? Good stuff there! Waiting to see it all installed now.
The silica gel pouch is put in the packaging just to see that moisture from the air does not get on the electronic components. You can throw it away as soon as you take the equipment out for the install. Back when we all used tapes, I used to use loads and loads of silica gel crystals to protect the tapes from moisture/fungus building. The crystals turn white after a while, once they absorb a lot of moisture.
|17th April 2009, 14:13||#29|
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Join Date: Jan 2008
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And you can get them back into working shape by just microwaving them.
As for the customs duty thing, nonsense. They were trying to get money from your friends.
|17th April 2009, 15:17||#30|
Any comments about the "illumination lead" of HU? If I was to guess, it should be connected to head-lamp switch so that when I put on the lights, HU panel lights up too??
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