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  1. #1

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    Default 2 part question re: M70s and PSW110

    Just recently switched out a pair of M50s for M70s, which are hooked up to a Denon AVR 1612. They sound great, but at the same time they also seem like they're being underpowered. They aren't quite as responsive to volume increases as the M50s were. They definitely fill the room a lot better, but 75W/ chann is all the AVR 1612 can offer. So, I'm worried that I'm going to clip the amp and burst a tweeter or something to that effect. Is that a legitimate concern?

    Re: the PSW110...it does not have an off switch, but it does have what appears to be an auto standby switch. Just to be on the safe side, I leave it on the "On" setting and shut off the power strip it's plugged into after each use. I remember the amp still being warm after several hours of being in standby (i.e., "auto") mode , so I'm reluctant to use that setting. Am I being paranoid?

    Thanks.
    Denon AVR 3312CI
    Monitor 70s 30s CS2
    PSW110

  2. #2

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    1. Yes, do be careful, if you go to the reviews section in the Polk menus above you will read any number of people who did just that, i.e., blew a Monitor series tweeter or two by clipping their AVR! So don't get too ambitious with that Denon. You might want to think about upgrading to an AVR that has Pre-outs for the addition of a power amp that can better handle the 70s?

    2. The AUTO switch on a sub is what most people use. Unless you have a "defective" unit you're OK. Why leave your plate amp on all the time?

    Take care not to overdrive the PSW 110--it does have ITS limits.

    cnh
    Onkyo TX-SR 805 System #1 HT AVR
    Office Two Channel: LSi-7s (Nakamichi CA-5, NAD 214, Pioneer BDP51fd)
    Vintage Polks: Polk Monitor 5As, Monitor 7Bs [HK 730], Monitor 10As [Marantz 2265], SDA-2Bs [Jolida JD-303, Jolida MV-MK4]
    Headphones: HD600, Q701, ATH-M50s etc. Bravo Audio Ocean amp., Onkyo P-304, Adcom GFA-555, Technics Direct Drive TT

  3. #3

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    Yeah I'd definitely take it easy on the volume with that AVR. I had a Denon 1910 and cranked it up to demo a movie and clipped a tweeter when I had the Monitor series. A beefier AVR with pre outs for future upgrades is always a good option.
    Theater Room: Pioneer Elite SC-35, RTi12's, Csi5, Fxi5's, Fxi3's, ED A5-350 sub, Optoma HD20, 92'' Elite Screen, Sony BDPS790, Xbox One, APC H15, MIT Exp 2 SC's, Pepster PC's

    Living Room: Martin Logan ESL's, Peachtree Audio iNova, Zu Mission SC's & IC's, Pepster PC, Sharp Aquos 60'', AEX

    Bedroom: Panasonic AX200U projector, 110" screen

    Outdoor: Polk Atrium 5's, Yamaha Rxv371

  4. #4

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    I had M50's in my two channel and switched them out for the 70's. I was powering them with a similar avr. The 70's had a bigger sound, but seemed to lack the clarity and punch that the properly driven smaller speakers had. I added an amp to the 70's and that cleaned it up for me. If your listening at reasonable levels, however, I wouldn't think you would damage the speakers.
    2-channel
    Sources: Pro-ject 2.9 wood Grado Gold cartridge; Squeezebox Duet; Oppo BDP-83
    Amps: PS Audio GCPH; PS Audio DLIII(Cullen mods IV); Parasound Halo P3; B & K Reference 200.2
    Speakers: Polk - LSi15's(db sub mod)


    HT
    Amps: Sony - STR-DG1000; Outlaw 200 Mono; Speakers: Polk - CS2, Monitor 70's, RC80i's; Video: Optoma HD20; FAVI HD-100


    Man Cave (In Progress)
    Sources: Sony PS-LX410, Denon 3910; Amps: Dared sl2000a, HK 3490, Simaudio Moon LP3; Speakers: Polk - SDA 2A's

  5. #5

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    h21 is right. I actually run the same speaker set up with M70s, CS2, M30s and a 300/600 watt 12" sub on an Onkyo TX-SR 805 (which weighs almost 51lbs and can pretty much deliver its stated ratings of 130 watts or more per channel, which most AVRs cannot). Even on this I don't "blast" the M-70s but can get pretty loud. No damage so far. But to tell you the truth, the M-70s were more musical when I was running them on a Denon AVR 2807 as a pre-amp with an Adcom GFA-555 (200 watts x 2) power amp. Really, really opened things up! But since I don't really use the M-70s much for two channel anymore the Onkyo by itself is plenty of power for HT. Room is not that big!

    cnh
    Onkyo TX-SR 805 System #1 HT AVR
    Office Two Channel: LSi-7s (Nakamichi CA-5, NAD 214, Pioneer BDP51fd)
    Vintage Polks: Polk Monitor 5As, Monitor 7Bs [HK 730], Monitor 10As [Marantz 2265], SDA-2Bs [Jolida JD-303, Jolida MV-MK4]
    Headphones: HD600, Q701, ATH-M50s etc. Bravo Audio Ocean amp., Onkyo P-304, Adcom GFA-555, Technics Direct Drive TT

  6. #6

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    I appreciate all the replies. They were very helpful. I'm not one to crank it, so I guess I'm OK for the time being. I had been tossing around the idea of getting an external amp for the receiver, but I guess I would need to find one with line-level inputs, being as that this AVR does not have pre-outs. I'm not sure if there is such a thing for HT amps.

    I'm still iffy about leaving the sub in standby mode all the time. My previous AVR had pass-through power outlets, so I'm used to the idea of the sub turning completely off when the AVR is off. Just seems like too large of a piece of equipment to be left on at all even if it is "standby."
    Denon AVR 3312CI
    Monitor 70s 30s CS2
    PSW110

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