AudioAficionado.org - PMC MB2i SE - Bi-amp or Single amp

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- - PMC MB2i SE - Bi-amp or Single amp (https://www.audioaficionado.org/showthread.php?t=43103)

Folkman

08-12-2018 02:46 AM

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.

essjay

08-12-2018 03:19 AM

the MB2S are 4ohm as well.

Pyro	08-12-2018 03:54 AM

Quote:

Originally Posted by adol290 (Post 926631)

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.

Pyro	08-12-2018 04:01 AM

Quote:

Originally Posted by essjay (Post 926683)

the MB2S are 4ohm as well.

According to the PMC website, the current MB2S have an Impedance of 8 Ohms. :scratch2:

adol290

08-12-2018 09:58 AM

Quote:

Originally Posted by Pyro (Post 926684)

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.

Pyro	08-23-2018 05:28 AM

Dealer said the impedance was the same.

Folkman

08-24-2018 10:57 AM

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.

essjay

08-25-2018 08:11 AM

Quote:

Originally Posted by Pyro (Post 926685)

According to the PMC website, the current MB2S have an Impedance of 8 Ohms. :scratch2:

Hmm, guess i was wrong.

Pyro	08-25-2018 08:52 AM

Quote:

Originally Posted by adol290 (Post 917486)

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

adol290

08-25-2018 01:18 PM

Quote:

Originally Posted by Pyro (Post 928480)

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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