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  1. #1

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    Question Questions on amps

    Looking to get educated about amplifiers. Took the suggestion (but not purchased yet) about getting a parasound 2125 amp to help my 12s work when I get the rest of the ht speakers hooked to the Onk. A few questions though.
    1. With the amp putting more power to the towers, does that it any way throw off the balance (for lack of a better term) of the rest of the speakers?
    2. What about adding an amp to each tower itself later, will this make the towers overpower the rest of the speakers? Same question as 1 I guess... Just wondering what all the extra wattage is gonna actually do.
    3. When I'm adding an amp (or 2) is there anything else to look at such as amps/ch? Educate me fellas!
    AVR - Onkyo NR809
    500gb HD for MP3 and FLAC files
    Amp - Parasound 2250 - FOR SALE BTW!! PM me if interested!
    Mains - Polk RTi12 towers
    Center - CSi5
    Surround - FXiA6's
    Sub - psw505
    Movies and games - PS3
    TV - Toshiba 52" HD

    Every vehicle has one good nuetral drop in it

  2. #2

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    Also, is there any lag on the sound going through the extra electronics? Would it still be in sync with whats going on on the screen is what I mean I guess?
    AVR - Onkyo NR809
    500gb HD for MP3 and FLAC files
    Amp - Parasound 2250 - FOR SALE BTW!! PM me if interested!
    Mains - Polk RTi12 towers
    Center - CSi5
    Surround - FXiA6's
    Sub - psw505
    Movies and games - PS3
    TV - Toshiba 52" HD

    Every vehicle has one good nuetral drop in it

  3. #3

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    Yes, you are going to need at least 200wpc to drive the Rti12s to their potential. Good news is that you will free up headroom on the AVR so you can drive the center and rears with the AVR more efficiently. There might be some tweaking needed (on the AVR) to even out the sound, but you will be amazed at the sound of the 12s when fed some real power.
    It's better to burn out, than poop your pants


    CDM 1NT; B&W CDM CNT; Parasound HCA-1000a; Infinity us 1; Velodyne DEQ-8 x2; Pio Elite VSX-23; Sony SCD-CE595 SACD, Marantz CD5001, [/COLOR]

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    First, I will say that you don't *need* a 200wpc for home theater on your 12's but it won't hurt. I have B&K thats about 125 wpc and I'm fine with the sound from the supposed required magic 200 wpc. That being said, if your HT rig does double use for music too, the 200 wpc might provide a difference.

    Answer to 1 - The audyssey calibration your Onkyo uses will take care of most of the balance issues. You can adjust it manually too, if it just doesn't sound right after the calibration.

    Answer to 2 - Rather than get 2 amps, I would suggest a 3 channel amp and drive your mains and center with it. Let the AVR power the surrounds. If your not using a center, then one amp will be fine for the 12's.

    Answer to 3 - If there are any sync issues there is also a setting in your Onkyo where you can adjust this. The only sync issues you will really notice will be from the dialog and what would normally be coming out of the center. If the music or sound effects are a couple milliseconds later than they should be it is pretty hard to notice vs the voice not being in sync with the moving lips.

    Hope my .02 helps,
    Scott
    Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid. ..... Frank Zappa

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  5. #5

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    It should not effect any sync issues, and with the additional power available from the receiver to the surrounds you'd probably have to do nothing. In case you do, adjust the channel levels in your menu on the receiver.

    Don't overthink this. Run with it, hook it up with good quality rca cables and enjoy.

  6. #6

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    Quote Originally Posted by deronb1 View Post
    Yes, you are going to need at least 200wpc to drive the Rti12s to their potential. Good news is that you will free up headroom on the AVR so you can drive the center and rears with the AVR more efficiently. There might be some tweaking needed (on the AVR) to even out the sound, but you will be amazed at the sound of the 12s when fed some real power.
    Gotcha! 75% of the time or more, I just listen to music so amping the 12s will probably be all I do. Also with 2 amps running bridged and mono each, with the amp I'm looking at, supposedly will bring out 400w for each speaker! Sweetness! Until then just one amp running 125wpc for each tower will work fine.


    Quote Originally Posted by Gadabout View Post
    First, I will say that you don't *need* a 200wpc for home theater on your 12's but it won't hurt. I have B&K thats about 125 wpc and I'm fine with the sound from the supposed required magic 200 wpc. That being said, if your HT rig does double use for music too, the 200 wpc might provide a difference.

    Answer to 1 - The audyssey calibration your Onkyo uses will take care of most of the balance issues. You can adjust it manually too, if it just doesn't sound right after the calibration.

    Answer to 2 - Rather than get 2 amps, I would suggest a 3 channel amp and drive your mains and center with it. Let the AVR power the surrounds. If your not using a center, then one amp will be fine for the 12's.

    Answer to 3 - If there are any sync issues there is also a setting in your Onkyo where you can adjust this. The only sync issues you will really notice will be from the dialog and what would normally be coming out of the center. If the music or sound effects are a couple milliseconds later than they should be it is pretty hard to notice vs the voice not being in sync with the moving lips.

    Hope my .02 helps,
    Scott
    Definately helps a LOT! I figured as much but just wanted explained so I could understand what would happen. Thanks bro!!

    Quote Originally Posted by tonyb View Post
    It should not effect any sync issues, and with the additional power available from the receiver to the surrounds you'd probably have to do nothing. In case you do, adjust the channel levels in your menu on the receiver.

    Don't overthink this. Run with it, hook it up with good quality rca cables and enjoy.
    Will do!! Just trying to understand more about what I've got and what it actually does.

    Thank you all for the help! Sounds like I've got a plan now!!
    Last edited by snake1; 09-01-2012 at 09:45 PM.
    AVR - Onkyo NR809
    500gb HD for MP3 and FLAC files
    Amp - Parasound 2250 - FOR SALE BTW!! PM me if interested!
    Mains - Polk RTi12 towers
    Center - CSi5
    Surround - FXiA6's
    Sub - psw505
    Movies and games - PS3
    TV - Toshiba 52" HD

    Every vehicle has one good nuetral drop in it

  7. #7

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    I have seen people on here say a bridged amp doesn't sound as good. Maybe look for single channel mono block amps. You could then find a 3rd one later on for the center channel.

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    Not a fan of bridged amps either, most don't like impedance swings when bridged. I would shoot for a regular good quality 2-3 channel amp and be done with it.

  9. #9

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    What kind of $$ are we talking when you say
    'good'?

  10. #10

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    For 2 channel, many used good amps out there under 600 hundred bucks from the likes of B&K, Parasound, Adcom, just to name a few. Plenty of others also. Since you have the rti12's, maybe go with a warmer sounding amp like a B&k.

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    I run a Carver A-753x it is 250 watts x 3 channel. There are older TFM 35 and 45's on ebay in the $300-400 range. Carvers are known to be warm as well.

  12. #12

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    Quote Originally Posted by jbooker82 View Post
    I have seen people on here say a bridged amp doesn't sound as good. Maybe look for single channel mono block amps. You could then find a 3rd one later on for the center channel.
    Wonder why it doesn't sound good? Any good brands for a mono?

    Quote Originally Posted by jbooker82 View Post
    I run a Carver A-753x it is 250 watts x 3 channel. There are older TFM 35 and 45's on ebay in the $300-400 range. Carvers are known to be warm as well.
    I will be looking into these as well! Thanks!
    AVR - Onkyo NR809
    500gb HD for MP3 and FLAC files
    Amp - Parasound 2250 - FOR SALE BTW!! PM me if interested!
    Mains - Polk RTi12 towers
    Center - CSi5
    Surround - FXiA6's
    Sub - psw505
    Movies and games - PS3
    TV - Toshiba 52" HD

    Every vehicle has one good nuetral drop in it

  13. #13

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    What would bi-amping each amp to each set of posts do? For ex. 125w to the top and bottom separately, and run 2 amps in that config?
    AVR - Onkyo NR809
    500gb HD for MP3 and FLAC files
    Amp - Parasound 2250 - FOR SALE BTW!! PM me if interested!
    Mains - Polk RTi12 towers
    Center - CSi5
    Surround - FXiA6's
    Sub - psw505
    Movies and games - PS3
    TV - Toshiba 52" HD

    Every vehicle has one good nuetral drop in it

  14. #14

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    I would probably just get a good 2 channel amp and hook them up regular. If you put a 125 x 2 amp on your rti's you get 125 watts to the midrange section, and 125 watts to the bass section. You power two different circuits so your not putting 250 watts in to the speaker.

    Where biamping really shines is when you use an xo between the amps, and the pre amp. That way you can control what frequencys go to wich part of the speaker, and the ampilifer only amplifies the signal that is going to be used. Other wise both channels of the amp will amplify the entire range of sound and send full range to the tweeter circuit and full range to the bass section.
    Last edited by jbooker82; 09-04-2012 at 12:55 AM.
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II

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    What is an "xo"?
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  16. #16

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    Quote Originally Posted by stretchl View Post
    What is an "xo"?
    crossover-cross over-xo

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