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Thread: Amplifiers and speakers, Understanding the numbers?

  1. #11
    FLAC greatwhite's Avatar
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    Quote Originally Posted by Woofnstuff View Post
    with the KX simple is better when making your own DSP.
    ive got 5 KX setups now and they have enabled me to do things that would have cost a heap load more for next to nothing

    gimme a yell if you get stuck on KX
    Heck yeah.

    I'm using the kxdriver as delivered right now. Still reading on that one too. I'm actually a little bit scared to mess with making my own dsp yet, not sure if I'd bugger it up and not be able to go back to stock.

    I'm just looking for front 6.5 componets and a sub right now. I might be looking for 5.1 in the future. I have to say though, your post on listening to music and someone else watching a dvd was intriguing...........

    I've read the how to's, saved a couple and may take the plunge soon in making my own "little boxes and lines".

    Guess my biggest question is not routing the sound through the dsp, it's whether or not I need to add effects, mixers, etc or if the chip will do it all as delivered.

    Biggest problem I have with the kx project right now is that I can only play with it in the car and it's currently -11 C here.............
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
    Leonardo Da Vinci

  2. #12
    MySQL Error scott_fx's Avatar
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    just an update, the northcreek tweeter from zaph's site says it was discontinued but they have 200 pairs left
    New System in progress:
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    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
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  3. #13
    Maximum Bitrate Woofnstuff's Avatar
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    this is my KX setup i use for my application.. i wanted 4 stereo outputs...

    if you bugger the KX setup just right click in the dsp windows somewhere and "reinitialize DSP" that puts it back to factory


  4. #14
    MySQL Error scott_fx's Avatar
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    just read about this sub which looks really promissing in a ported box or even a smallish sealed box:
    http://www.partsexpress.com/pe/showd...number=297-460
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

  5. #15
    Constant Bitrate ronjon228's Avatar
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    Well I took a quick skim over those links and just had a few questions/comments to make to sum up my experience with car audio equipment and tuning.

    Always, always remember KISS (Keep it simple stupid). Too many people go with all kinds of EQ's, Crossovers, Amps, Channels, etc. that absolutely murder the source to the point that it's already mucked up beyond comprehension. Here's a few good rules of thumb to go by...

    -Always tune with our EQ's flat (only use the EQ after for MINOR adjustments +/-2db or so)
    -Never cross over a signal more than once (ie running low pass out of head unit/pc and then having low pass filter on @ the amp = bad)
    -Only go active if you have SQL experience and a good ear (also SQL equipment REALLY helps)
    -Tune to what sounds good to YOU (this really is the most important)

    If you follow those rules, you should be ok. Basically the less you alter your source, the better the end result is going to be. If you have to change your EQ settings, cross over settings, or gains out of spec, it means your hardware isn't made for what you're trying to do. Therefore at this point it becomes highly beneficial to purchase hardware suited to your application/preference. Then you can use the hardware as your base tune and fine tune with your EQ's, cross overs, gains, etc. In the case of signal processing, less is always more.

    When purchasing various equipment there are important factors to consider. The following generally apply.

    -Signal to Noise Ratio or SNR (the higher the better, especially important for amps)
    -THD (lower is better)
    -Frequency Response (Hz range)
    -RMS power (peak power is useless)
    -Ohms

    When picking up amps or speakers remember that the above is important in COMBINATION.

    First, decide whether you want to go active or passive. This will influence all of the purchases hence forth. If you're going active, do your homework and be prepared for some serious tuning. In the end, any finely tuned active system will sound better than a comparable passive system. However this tuning takes more experience and equipment than passive route. Just keep this in mind.

    Next pick out your speakers based on your preference. If you like soft highs, get silk dome tweeters. If not, grab metal dome tweeters. If you like more heavy mid-range get mid-bass drivers that have lower Hz response. Etc, etc. Also, make sure to note the impedance (2ohm, 4ohm, etc.) of all the speakers you'll be using. This is important for matching up the proper amp.

    Once you've got your speakers picked out, get an amp to match them. First and foremost, make sure your amp can operate at the proper impedance (ohms) of the speaker(s) you've selected. If your amp can't match the impedance of speakers being used it will render the amp useless. You can cause MAJOR damage to the amp or speakers by running incorrect impedance levels (especially to the amp). Check the x-over's on the amp vs. the Hz response of the speakers to make sure you can match them up. If you're going active, it really doesn't matter, but you get my point. Also, get an amp that pushes 25-33% more RMS (very important to use RMS on all components) than the speakers are "rated" at. This way you can keep the gains down and the signal clean. Remember that any amp produces more noise and higher Db levels, meaning that even an amp with a killer SNR will sound terrible if you're using 100% of the wattage it can produce. This is why using that 25-33% buffer zone is important.

    Once you've got the speakers and an amp selected, the rest is up to you. Tune the system to your liking and DON'T mess with it after. One of the worst things you can do is try to fiddle with it too much or change/add/remove too many components. This will throw all the work you've done out the window, remember KISS again.
    CarPC:
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    Sound System:
    Phoenix Gold RSD 65cs 6.5" Drivers, Infinity Tweets, Pioneer 305DVC 12", PPI Sedona 630IX, Alpine MRP-M500

  6. #16
    FLAC greatwhite's Avatar
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    Thanks for the reply, processing............
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
    Leonardo Da Vinci

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