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  #11  
Old 08-12-2018, 02:46 AM
Folkman Folkman is offline
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Yes they are definitely 8 ohms.

I bought a new pair 2 months ago and was initially interested in either the IB2se or the MB2se. PMC themselves recommended the MB2se as they are an easier load for the amp.
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  #12  
Old 08-12-2018, 03:19 AM
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the MB2S are 4ohm as well.
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  #13  
Old 08-12-2018, 03:54 AM
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Quote:
Originally Posted by adol290 View Post
Not sure if i understand your question.

The MB2's are 4 ohm. There is no selection on the bryston amps for 8 or 4 ohm.
My bad, I was unaware your amps do not have the ability to select the different impedance levels manually to match the speakers connected to them.

From the PMC manual, impedance for MB2SE is 8 ohms.

This is what I was asking.

Single Amp > HF_MF_LF = Impedance of 8 Ohms
Bi-Amp 1st Amp > LF = Impedance of ?
Bi-Amp 2nd Amp > MF_HF = Impedance of ?

I don't know the answer, that is why I am asking. It seems to me that you would have different impedance ratings when all three drivers (HF_MF_LF) are connected vs. two drivers connected (HF_MF) and one driver (LF) individually connected.

I sent an inquiry to my dealer.
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2CH Room PMC MB2se(2). JL Audio F113(2). McIntosh C1000C/T, MC2301(2). PS Audio Directstream DSD, PowerPlant 20. Clearaudio Ovation/Magnify/Stradivariv2. Misc: Wireworld Cables and Interconnects. Stillpoints Ultra 5, Ultra SS. GIK Acoustics Bass Traps. DIY Computer Audio Transport. Racks. Adona.
TV&Movies PMC EB1i(2), CB1i, OB1i(2). SVS Ultra16(2). McIntosh MC207. Bryston SP4.

Last edited by Pyro; 08-12-2018 at 06:57 AM.
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  #14  
Old 08-12-2018, 04:01 AM
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Quote:
Originally Posted by essjay View Post
the MB2S are 4ohm as well.
According to the PMC website, the current MB2S have an Impedance of 8 Ohms.
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2CH Room PMC MB2se(2). JL Audio F113(2). McIntosh C1000C/T, MC2301(2). PS Audio Directstream DSD, PowerPlant 20. Clearaudio Ovation/Magnify/Stradivariv2. Misc: Wireworld Cables and Interconnects. Stillpoints Ultra 5, Ultra SS. GIK Acoustics Bass Traps. DIY Computer Audio Transport. Racks. Adona.
TV&Movies PMC EB1i(2), CB1i, OB1i(2). SVS Ultra16(2). McIntosh MC207. Bryston SP4.

Last edited by Pyro; 08-12-2018 at 04:10 AM.
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  #15  
Old 08-12-2018, 09:58 AM
adol290 adol290 is offline
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Quote:
Originally Posted by Pyro View Post
It seems to me that you would have different impedance ratings when all three drivers (HF_MF_LF) are connected vs. two drivers connected (HF_MF) and one driver (LF) individually connected.

I sent an inquiry to my dealer.
Please post the results when you get them.
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  #16  
Old 08-23-2018, 05:28 AM
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Dealer said the impedance was the same.
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2CH Room PMC MB2se(2). JL Audio F113(2). McIntosh C1000C/T, MC2301(2). PS Audio Directstream DSD, PowerPlant 20. Clearaudio Ovation/Magnify/Stradivariv2. Misc: Wireworld Cables and Interconnects. Stillpoints Ultra 5, Ultra SS. GIK Acoustics Bass Traps. DIY Computer Audio Transport. Racks. Adona.
TV&Movies PMC EB1i(2), CB1i, OB1i(2). SVS Ultra16(2). McIntosh MC207. Bryston SP4.
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  #17  
Old 08-24-2018, 10:57 AM
Folkman Folkman is offline
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Now I an no electronics engineer , but from reading I believe there is a change in impedance when splitting a crossover.

Apparently impedance specs are normally given with both high and low crossover networks and drivers connected together.

Usually when splitting the crossover , the mid/tweeter section will exhibit a higher impedance and the woofer section a lower impedance.
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  #18  
Old 08-25-2018, 08:11 AM
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Quote:
Originally Posted by Pyro View Post
According to the PMC website, the current MB2S have an Impedance of 8 Ohms.
Hmm, guess i was wrong.
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  #19  
Old 08-25-2018, 08:52 AM
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Quote:
Originally Posted by adol290 View Post
I have a pair of PMC MB2 SE on order.

Or do a 7b3 on the bass and a 4B3 bridged on the midrange/tweeter.

I already have the 7b3's and 4b3 to do the bi-amp.
With this configuration, you will need an active crossover.

When doing some research on bi-amping, it was noted that using amps with different gains/sensitivity will unbalance the intended sound of the speaker and therefore an active crossover was necessary.

or

Use the same style amp for each of the feeds; Bass and Mids_Tweets.

This was interesting.

https://pmc-speakers.com/technology/crossovers
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2CH Room PMC MB2se(2). JL Audio F113(2). McIntosh C1000C/T, MC2301(2). PS Audio Directstream DSD, PowerPlant 20. Clearaudio Ovation/Magnify/Stradivariv2. Misc: Wireworld Cables and Interconnects. Stillpoints Ultra 5, Ultra SS. GIK Acoustics Bass Traps. DIY Computer Audio Transport. Racks. Adona.
TV&Movies PMC EB1i(2), CB1i, OB1i(2). SVS Ultra16(2). McIntosh MC207. Bryston SP4.
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  #20  
Old 08-25-2018, 01:18 PM
adol290 adol290 is offline
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Quote:
Originally Posted by Pyro View Post
With this configuration, you will need an active crossover.

When doing some research on bi-amping, it was noted that using amps with different gains/sensitivity will unbalance the intended sound of the speaker and therefore an active crossover was necessary.

or

Use the same style amp for each of the feeds; Bass and Mids_Tweets.

This was interesting.

https://pmc-speakers.com/technology/crossovers

The bryston amps have a selectable gain switch, so they can be all set to the same gain, so it can be done without the crossover.

That is an interesting article, but they talk about the fact speaker crossover.
I assume(hope) the same care is taken for the MB2SE speakers also.

I had a pair of IB2i Actives and had to replace the boards 3 times.
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