CS1 Center channel speaker question

adman57
adman57 Posts: 2
edited December 2009 in Basic Hookup/Wiring Questions
I just bought a CS1 center channel speaker not realizing it was a 4 ohm speaker. I have a Sony STR-K840P receiver that is rated at 8 ohms. I know now this is not a good fit, but want to know if I will damage the amp by using these together.

Thanks.
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  • Knucklehead
    Knucklehead Posts: 3,602
    edited December 2009
    The CS1 is an 8 ohm speaker and will work just fine with your Sony. Welcome to CP!
    Polk Audio Surround Bar 360
    Mirage PS-12
    LG BDP-550
    Motorola HD FIOS DVR
    Panasonic 42" Plasma
    XBOX 360[/SIZE]

    Office stuff

    Allied 395 receiver
    Pioneer CDP PD-M430
    RT8t's & Wharfedale Diamond II's[/SIZE]

    Life is one grand, sweet song, so start the music. ~Ronald Reagan
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  • KASR
    KASR Posts: 450
    edited December 2009
    Where did you hear that it was 4 ohm?
    Living room:
    Optoma HD20
    Elite Sable 100"
    Marantz NR1501
    Polk RM6750
    Polk Monitor 50 x 2
    Polk CS1
    2 x Polk PSW110
    2x Sennheiser RS120
    Toshiba HD-A20 x 2
    Vizio VBR220
    Sony CDP-CE375
    Xbox 360 Elite
    --
    Bedroom:
    Olevia 242T
    Sony BDP-S370
    Xbox 360 Pro
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  • adman57
    adman57 Posts: 2
    edited December 2009
    This post on Newegg:
    Pros: Excelent sound and quality.
    I rated it 4 because I had to match the impedance from 4 ohm to 8 ohm to be able to use it.
    Otherwise it would be a five.

    Cons: Wrong specs: it is a 4 ohm speaker that could blow your amp. Mine turned itself off a couple of times...lucky me.
    Then I decided to measure the impedance and 4 ohms it was!

    The manual does not list POWER RATING and it states that it is COMPATIBLE with 8 ohm systems (whatever that means). It sent my amp into the PROTECTED STAGE a couple of times so I decided to measure the impedance and it happens to be 4 ohms. I solved the problem with a transformer to match the impedance to the 8 ohms of my center channel and it is working fine.

    Other Thoughts: As I was very surprised with the 4 ohm measurement I went ahead and measured every speaker in my home, most of them were 8 ohm except for the R50s...again they are 4 ohm speakers and did not get my attention before because my front channel accepts 4 to 8 ohm speakers.
    If you encounter the same problem, do not usa a 4 ohm resistor in series as it would consume half the power, for example, in a 100 watts/channel, it would take a 50 watt resistor that would get very hot. Instead, use a transformer to match the impedance to that of your amp.
    I used one with my CS1 to match it to my 8 ohm center channel and it works fine. So it is compatible with 8 ohm systems if you add a transformer...very tricky way of writing the specs for a speaker. Almost anything is compatible if you know how to adapt it.
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  • Knucklehead
    Knucklehead Posts: 3,602
    edited December 2009
    thats b.s.....you cant effectivley measure ohms of a speaker with a meter, your reading accross a crossover etc.....you will be fine.
    Polk Audio Surround Bar 360
    Mirage PS-12
    LG BDP-550
    Motorola HD FIOS DVR
    Panasonic 42" Plasma
    XBOX 360[/SIZE]

    Office stuff

    Allied 395 receiver
    Pioneer CDP PD-M430
    RT8t's & Wharfedale Diamond II's[/SIZE]

    Life is one grand, sweet song, so start the music. ~Ronald Reagan
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  • concealer404
    concealer404 Posts: 7,440
    edited December 2009
    LOL 4ohm R50s!
    I don't read the newsssspaperssss because dey aaaallllllllll...... have ugly print.

    Living Room: B&K Reference 5 S2 / Parasound HCA-1000A / Emotiva XDA-2 / Pioneer BDP-51FD / Paradigm 11se MKiii

    Desk: Schiit Magni 2 Uber / Schiit Modi 2 Uber / ISK HD9999

    Office: Schiit Magni 2 Uber / Schiit Modi 2 Uber / Dynaco SCA-80Q / Paradigm Legend V.3

    HT: Denon AVR-X3400H / Sony UBP-X700 / RT16 / CS350LS / RT7 / SVS PB1000
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  • Knucklehead
    Knucklehead Posts: 3,602
    edited December 2009
    concealer404 wrote: »
    LOL 4ohm R50s!

    SSSHHHHH......dont tell my AVR that!:rolleyes:
    Polk Audio Surround Bar 360
    Mirage PS-12
    LG BDP-550
    Motorola HD FIOS DVR
    Panasonic 42" Plasma
    XBOX 360[/SIZE]

    Office stuff

    Allied 395 receiver
    Pioneer CDP PD-M430
    RT8t's & Wharfedale Diamond II's[/SIZE]

    Life is one grand, sweet song, so start the music. ~Ronald Reagan
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  • concealer404
    concealer404 Posts: 7,440
    edited December 2009
    Knucklehead wrote: »
    SSSHHHHH......dont tell my AVR that!:rolleyes:

    It's ok baby... it's ok. :p

    I think R50s have been one of the easier speakers to drive that i've had in recent memory. Maybe second to VS-25s.
    I don't read the newsssspaperssss because dey aaaallllllllll...... have ugly print.

    Living Room: B&K Reference 5 S2 / Parasound HCA-1000A / Emotiva XDA-2 / Pioneer BDP-51FD / Paradigm 11se MKiii

    Desk: Schiit Magni 2 Uber / Schiit Modi 2 Uber / ISK HD9999

    Office: Schiit Magni 2 Uber / Schiit Modi 2 Uber / Dynaco SCA-80Q / Paradigm Legend V.3

    HT: Denon AVR-X3400H / Sony UBP-X700 / RT16 / CS350LS / RT7 / SVS PB1000
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  • KASR
    KASR Posts: 450
    edited December 2009
    Someone at newegg is smack da CRACK!

    Per Polk's site:
    Electrical
    Overall Frequency Response: 55Hz - 25kHz
    Lower: -3dB Limit 65Hz
    Upper: -3dB Limit 24kHz
    Nominal Impedance: 8 ohms
    Living room:
    Optoma HD20
    Elite Sable 100"
    Marantz NR1501
    Polk RM6750
    Polk Monitor 50 x 2
    Polk CS1
    2 x Polk PSW110
    2x Sennheiser RS120
    Toshiba HD-A20 x 2
    Vizio VBR220
    Sony CDP-CE375
    Xbox 360 Elite
    --
    Bedroom:
    Olevia 242T
    Sony BDP-S370
    Xbox 360 Pro
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  • wutadumsn23
    wutadumsn23 Posts: 3,702
    edited December 2009
    Yeah, I agree with the guys here. Somebody got their wires crossed, lol. CS1 is def. an 8 ohm speaker. Hook er up and enjoy!! Welcome to Club Polk.

    -Jeff
    HT Rig
    Receiver- Onkyo TX-SR806
    Mains- Polk Audio Monitor 70
    Center- Polk Audio CS2
    Surrounds- Polk Audio TSi 500's :D
    Sub- Polk Audio PSW125
    Retired- Polk Audio Monitor 40's
    T.V.- 60" Sony SXRD KDS-60A2000 LCoS
    Blu-Ray- 80 GB PS3


    2 CH rig (in progress)
    Polk Audio Monitor 10A's :cool:

    It's not that I'm insensitive, I just don't care.. :D
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  • Spehoks09
    Spehoks09 Posts: 10
    edited December 2009
    I am guessing that is a gas fireplace ? If you dont use it, you could put either a long shelf just below the mantel piece but about the same length, then set other things on it, with the center channel on its side of course. Or you could put a shelf up just big enough for the center channel speaker itself.
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  • john E
    john E Posts: 32
    edited December 2009
    It does show 4 ohms when you measure it with a ohm meter ,but you have to take in acount that you are measureing it with the built in cross over.
    ONKYO TX-SR607
    PolkAudio Speakers
    Front-Monitor 70's
    Center-CS2
    Sur-round-Monitor 40's
    Sur-round Back-Monitor 60's
    Subwoofer-PSW-505
    Back fill in Bass PSW-10
    LG 50"Black 1080P Plasma HDTV (50PS60)
    LG Blu-Ray Disc BD390
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  • dorokusai
    dorokusai Posts: 25,577
    edited December 2009
    You can't measure actual impedence of a loudspeaker, with a VOM, at the binding posts. It's not quite that easy or every loudspeaker in the world would be incorrect.

    The information that states the CS1 or R50 are 4ohm is 100% incorrect.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • dorokusai
    dorokusai Posts: 25,577
    edited December 2009
    adman57 wrote: »
    I just bought a CS1 center channel speaker not realizing it was a 4 ohm speaker. I have a Sony STR-K840P receiver that is rated at 8 ohms. I know now this is not a good fit, but want to know if I will damage the amp by using these together.

    Thanks.

    As mentioned previously, no worries. It is NOT a 4ohm loudspeaker.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • 32deuce
    32deuce Posts: 49
    edited December 2009
    I read that too. I talked with Polk Tech, its like these guys say, you cant measure like guy in comment said.

    He posted under polk forum under r50's being 4 ohm also.

    But they are 8 ohm, and work fine.

    Deuce
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