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Mr_Spock

Member Since 25 May 2013
Offline Last Active Aug 25 2014 08:59 PM
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#401633 2014 Upgrades

Posted by Mr_Spock on 25 August 2014 - 09:00 PM

Ok - i agree with most of that - for most people class D fine and has efficiency advantages when running in a car enviroment, but look at the spec/ quality of the focals - i think that car owners wantling to turn their cars into a high fidelity/ quality enviroment would benifit from the (even slight) quality edge that a class AB amp has over a classD - in my experience a classD amp can get a bit harsh/ gritty at the top end when driven hard at high volume levels, and many musicians, sound engineers, hi-fi enthusiasts etc would hear the difference, i realize manufacturers' are continuing to develop classD designs to bridge the gap to class AB - but for me, class AB has the edge in quality

 

The difference may be small, and the difference between different speakers (sound quality wise) is probably bigger but with class AB amps available for less than a classD, its a no-brainer (for front speakers at these power levels) for subs or very high power (eg competition) systems,(power/ efficiency over quality) classD may be the way to go

 

- people debate class D vs class AB -  

 

http://www.diyaudio....-amplifier.html       

 

You have good arguments - I do not disagree. 

 

Thinking only money and SQ - Class AB would be preferable.

 

But in a car with stock electrical system - Class AB delivering 40% of its power consumption in to the heatsink. Voltage drop could compromise sound quality. For me this is a bigger concern - than the difference in SQ between Class AB and Class D. I can not hear the difference - not at home - and probably not in the car. 

 

But maybe, as you wrote - using Class D for sub and Class AB for the front set - is the best choice - a good comprimise of cost, voltage drop and SQ? 




#401576 2014 Upgrades

Posted by Mr_Spock on 25 August 2014 - 06:22 PM

The infinity amp is overpriced at £350, and the total harmonic distortion at the rated output is 1% thats (bad) brobably due to the cass D output stage - translation = its crap

 

The much cheaper BOSS amps are 0.01% total harmonic distortion at the rated output (exellent quality) - i looked at scores of amps to find an affordable one (or range of amps) with i very high spec (including superior class AB output stages ) at an affordable pric- this amp/ range of amps blows many much more expensive amps away (in terms of quality)   

 

Im not looking at brand names but at technical specs

 

You could get 2 boss amps, and this active boss x-over -

 

http://www.ebay.co.u...sd=321433206636

 

 http://www.ebay.co.u...=item4ad6e97f6c

 

for less than 1 overpriced (and inferior) amp   - and that would mean you have more left over for another set of focals -

 

so you could have the seperate active x-over (with fine control of the system) + 2 four chanel amps so the front and rears would be active, 8x (an amp for each woofer + tweeter!) 150w = 1200w so awesome power, headroom and clarity - and a fraction of the price of an equivelant system

 

PS - yes your sub x-over frequency is low, try 100 to 200hz, see how it sounds, you may need to turn the bass down   

 

I beleive THD less than 1% on the Kappa 4 - means 0,05% :

 

http://eu.infinitysy...kappa-four.html

 

As for the Class AB vs Class D, at home in a very good listening environment - maybe you are right. Class A - for sure. Still - I own a Pioneer home cinema receiver, with class D - and I beleive it collected top results in every review I have read. And I like it too :)

 

In a car - with lot of roadnoise etc - and perhaps playing mp3's - spotify - I do not believe it would be an hearable improvement using class AB over class D. 




#400587 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 22 August 2014 - 12:59 PM

No issues, cheap (£270 in Norway), delivers great power without getting hot, small and easy to install, looks great. Sounds great with my Infinity Kappa component speakers.

 

I mainly choose the Kappa amplifiers, because I use Kappa speakers in the car (and the specs) - and I have been very pleased with the choise. But I would surely been happy with another brand too.

 

good luck on your amplifier hunt :)




#400584 2014 Upgrades

Posted by Mr_Spock on 22 August 2014 - 12:46 PM

Hi , Hassen, your setup looks great. Great Work I agree with FOCA's advices. But I think class D are totally ok in the listening envirement of a car. Think voltage drop are a bigger concern - class D delivers more power, using less current.

 

Choosing SQ - active crossovers with time-alignment sure will improve.

 

The prefab sub looks great. Love the pictures - fun to watch your progress.




#280882 Another Focus

Posted by Mr_Spock on 08 August 2013 - 04:52 PM

Awesome looking Focus - sure like the colour  :lol:




#278880 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 31 July 2013 - 12:38 PM

Thank you :)




#266674 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 10 June 2013 - 06:50 AM

Thorough cleaning before attaching the damping sheets. First vacuum, next wash with soap and water - and wipe off with Methylated Spirits (or similar product). I believe summer temperatures would benefit both attachment and making the sheets more flexible to work with. Check for tips were you buy the damping sheets.

 

To get a more complete sound dampening, I believe they recommend that you lay multiple layers of different types of damping mats. As different types og mats dampens different types of sound.

 

I like your plan, take your time :)




#265742 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 06 June 2013 - 07:26 PM

And of course - i did install a Car Alarm:

 

IMG_8610web.jpg

 

With a nice blue flashing LED:

 

IMG_8677web-1.jpg

 

It connects with the cars can-bus circuit - so it turns on and off with the central locking - using the key fob.




#265620 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 06 June 2013 - 10:59 AM

Now, there is only one thing missing - in this "Complete Stereo Installation" - the Head Unit! Halfway in to this project, Pioneer presented a new cd-player - the Pioneer DEH-80PRS, offering 3-way active network/crossover etc - to a price fitting my budget. I could'nt be more happy :)  It is an awesome sound quality unit. Having all the features I could wish for. Installing the unit in the dash was easy, bought a fascia with wiring loom on Ebay:

 

IMG_8446web.jpg

 

I hooked it up with the steering column control, wiring and components for Ebay:

 

IMG_8409web.jpg

 

Connecting in the rear of the head unit:

 

IMG_8412web.jpg

 

Works great - even if I prefer to use the head unit controls.

 

IMG_8411web.jpg

 

The unit have an Auto Setup funktion, were it adjusts sound parameters, using the included mic:

 

IMG_8429web.jpg

 

Start the setup, leave the car, close the doors and wait 5 minutes until the display indicate it is finished:

 

IMG_8443web.jpg

 

The result is fantastic, key fetures are setting the speaker distance perfectly - placing you in the sweetspot, adjusting to a pre set equalizer curve, autolevelling all amplifier channels - and setting up the 3-way active network for you. After the auto set-up you can manually adjust all parameters to your personal liking. I did some reading on the frequency range of all speakers and did some adjustments, easy performed on the unit:

 

IMG_8117web.jpg

 

There was quite a bit of adjustment going on -  the first couple of months - as I played music, where some songs were to "boomy" and some to "thin" - but I did find a setup that was satisfying. Now I haven't adjusted anything for months.

 

I havent explored any of the other features on the head unit, I believe it have Bluetooth and radio??  :D  I rip my favourite songs from my cd collection in 320kbps mp3, transfer them to a 32GB SD memory card (can hold about 5000 songs), put it in the memory slot hidden behind the display and choose random play. If I want to hear a special song or an album I easily navigate the librarys to find it.

 

The stereo installation have now been in use for almost a year and have worked 100%. In the beginning I drove the car some times for no reason other than to listen to music, well I still do  :D




#265364 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 05 June 2013 - 10:26 AM

I had decided on a 2 amplifier configuration - one powerful mono amplifier for the subwoofer - and one 4 channel for the speakers in the front doors. With this configuration, I would have the opportunity to use 3-way active crossover setup. A dream come true - for a hifi interested fellow like me - but head units including this feature, are usually way to expensive for my wallet. Anyway - with this cable and amplifier configuration - I could choose all possible setups.

 

After a lot of measuring and browsing the net for suitable amplifiers - I found the Infinity Kappa series amplifiers being a good choice - mostly for their small size and shape. Being class D amplifier technology, they generate less heat and increased effiency, giving a compact design.

 

IMG_8107web.jpg

 

IMG_8110web_zpscebc1833.jpg

 

I was happy to se that they fitted very well under the plastic panels on each side of the luggage compartment - cables already laid it was an easy job:

 

Here is the Infinity Kappa One for the subwoofer:

 

IMG_8326web_zps96b502c7.jpg

 

 

And the Infinity Kappa Four for the front door speakers:

 

IMG_8328web_zpsf4161790.jpg

 

To prevent short-ciruiting of the subwoofer speaker cables - when the the subwoofer is removed from the luggage compartment:

 

IMG_8505web-1_zpsacdca822.jpg

 

I installed an on/off switch for the subwoofer amplifier:

 

IMG_8514web.jpg

 

I am very happy with the result in the luggage compartment:

 

IMG_8608web.jpg




#265285 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 04 June 2013 - 02:16 PM

Finished with all cables and dampening - it's back to stereo components, starting with the subwoofer. Being very satisfied with the Infinity speakers in the front doors - I choose to use 2 of their 120.9W 12" subwoofers. Reading the specs, I found a sealed enclosure would fit me better than an ported - smaller and flatter frequency response (better sound quality). Found a pre-built sealed enclosure meeting the exact volume specs from Bassworx:

 

IMG_8091web.jpg

 

IMG_8090web.jpg

 

IMG_8092web.jpg

 

The enclosure had Push post terminals pre-installed for easy disconnecting of the cables:

 

IMG_8459web.jpg

 

 

Installed carrying handles, on both sides, to make it easy to carry the box in and out of the luggage compatment:

 

IMG_8457web_zps8ab7c53c.jpg

 

IMG_8464web_zps1df84b5f.jpg




#264958 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 03 June 2013 - 12:16 PM

The amplifiers I bought are not too powerful, but will put a strain on the electrical system in the car. I decided to reinforce the main parts - the battery and the connections between battery, generator and the bodywork. Over dimensioning is always a good thing. The original generator gives 105A - wich is pretty good. 

 

IMG_7486ENGWEB_zpsb7e867b7.jpg

 

A Ford Motorcraft 52A Cadmium battery, fitted from the factory, was still in the car. When removing it, I discovered a removeable distance "thingy" , that when removed - would give place to a bigger battery:

 

IMG_8372web-1_zps0c392cfb.jpg

 

I measured the empty battery box and went to my local "cheap-but-good-quality-car-parts" shop and found the biggest battery that would fit, and have the correct layout to fit car terminals. I found a 75Ah Silver Cadmium (important to use with the Focus Smart Charge system) that fittet perfectly.

 

To make the system more robust to higher amps - I just found cables that were as thick - or thicker - as the originals - and connected them in parallel. These are found very cheap and already terminated in all sizes on Ebay:

 

IMG_8404engweb_zpsdd8992de.jpg

 

I also laid a well over-dimensioned + cable for the Head Unit. All + cables with proper fuse mounted close to the battery.

 

Cable collector:

 

IMG_8720web_zpsc08a688c.jpg




#264758 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 02 June 2013 - 02:57 PM

Grounding the amplifiers demands really good connection - using the seatbelt bolts are a good solution when placing the amplifiers in the back. I use one on each side, doing separate positive power cabling to each amplifier - I do the same for the negative power:

 

IMG_8236web_zps3e755b17.jpg

 

Sanding paper helps to get a clean metal surface, on bolts, seat belt and bodywork:

 

IMG_8211web.jpg

 

IMG_8212web.jpg

 

Finishing with a proper electrical/anti corrosive spray:

 

IMG_8216web.jpg




#264709 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 02 June 2013 - 10:05 AM

Having all sound dampening done - it was time for dealing with cables and stereo compononents. At this time I had decided to use two amplifiers: one 4-channel feeding the 2 way component speakers in the front doors - and one mono amplifier to feed a subwoofer. Speakers in the rear doors will not be in use. Both amplifiers and subwoofer will be placed in the luggage compartment. With this in mind - I knew were all cables had to be placed. 

 

I did voltage drop calculations on the power cables feeding the amplifiers - to ensure maximum perfomance. To get through the bulkhead, I went through a big, roomy cable rubber grommit already in place, in my car (with the steering wheel on the wrong side :) )  it's behind the glove compartment. 

 

Here comes a useful tip - do not place cables on top of the sills (marked red) - do the ekstra job and take out the seats and carpet (takes about 30 minutes or less) and lay them the along with the original wiring (marked green). A little longer way, but no problem with space or conflicting with plastic panels etc. Putting power cables on one side - and rca/signal cables on the other - also minimize interference.

 

IMG_8249WEB_zpse4a56bd4.jpg




#264530 Guide To Complete Stereo Installation Focus Mk2

Posted by Mr_Spock on 01 June 2013 - 12:24 PM

I took the opportunity to give the floor mat a real wash using foam lance and high pressure washer:

 

IMG_8228web.jpg