Is this BI-AMPING Dynaudios??????

[Bevan]

If I have two NAD integrated amps(352's) and a pair of Dynaudio 42's(with only one set of binding posts per speaker), can I bi-amp?

The amps have an extra pair of pre-outs, so if I connect one of the sets of pre-outs to the other amps pre-in, and have one amps left channel powering the left speaker, and the other amps right channel powering the right speaker, is this considered bi-amping?

What will be the gains?? twice the power?

If I can pick up the extra C352(80 watts) for cheap, would this be as/more effective that upgrading to a single more powerfull amp(eg C372 @ 150 watts) which would cost me about the same???

I like the two amp option as it will also allow me run a shotgun 4.1 system if I change the cables each time I change from 2 to 5 channel sources. (I'm guessing that using the remote to controll the volume will increase/decrease it on both amps equally, so if I calibrate using the channel level adjustment on my Denen 2200 universal player I shouldnt have any problems with channel levels. this sound right??)

thanks for help guys

b

 

[anamorphic96]

You would need two sets of binding posts on the speaker. Dynaudios only offer a single set of posts on the Audience 42's. True bi amping would also involve an electronic crossover as well. Most systems that use the dual amps and dual sets of posts for bi-amping are only doing whats called passive bi-amping.

Personally I would stick with the one 352. Get the 372 if you really feel you need the power. Keep it simple is my motto.

 

[Bevan]

thanks again for comming to my aid anamorphic96.

so its not considered bi-amping. maybe its more like monoblocking?

but if i did feel i needed more power, and getting the extra 352 proved easier and cheaper than selling the 352 i own and buying a 372, then i dont see any reason not to??

what i'm still not 100% sure of is that, if i only use one channel of an amp, do i get double the power compared to using both it's channels. (or does the idle channells power 'go to waste'?)

cheers

bevan

 

[mtrycrafts]

True bi amping would also involve an electronic crossover as well.

And bypassing the passive one internal to the speakers

 

[anamorphic96]

Its still considered bi - amping you are just using the passive crossovers in your speakers.

You will not be able to mono block the 352 receiver. If you only use one channel then you will only get 80 watts.

Your speaker is not set up for this. You should probably sell the extra 352 and get the C272 power amp and use the pre outs on the 352. If you change speakers in the future you will still be able to bi-amp since the 352 and 272 are gain matched.

 

[Bevan]

o.k, got it. thanks

 

[anamorphic96]

The one thing I forgot to mention is the C372 can be bridged. You can then use it with the C272 power amp. This would yield a massive amount of power.

Bridging amps from what I understand causes the noise floor of the amp to go up and some amps dont like 4 ohm loads when bridged as well.

How big is your room and what are youre listening habits like ?

 

[Bevan]

ya, i've heard mention of a downside to bridging, possibly the increased noise floor you mention. i would be interested to know more about this if anyone can enlighten us here?

room is 5.5x4.5m (15x18'). listning is half-part low volume jazz, world, acoustic and vocal, and the other half psy-trance and rock cranked way up.

pity the 352 is not bridgeable. i thing bridging a 372 would be a bit of overkill?

also, if the speaker is rated to 150W, is there not some danger in bridging two 150W amps? would the soft clipping feature be of any help here?

cheers

bevan

 

[anamorphic96]

As long as the speaker is not being overdriven it does not matter how much power you have. You just have to watch things when you turn up the volume.

Have you thought of adding a sub. This will definitely help. Being you could adjust the crossover and take some of the load off the 42's and send it to the sub.

 

[Electone]

If I can pick up the extra C352(80 watts) for cheap, would this be as/more effective that upgrading to a single more powerfull amp(eg C372 @ 150 watts) which would cost me about the same???


b

What Hi Fi just had a scathing review on the NAD C372 in their May issue. Although they love the C352, the C372 was described as having poor dynamics and sound quality. They gave it 2 out of a possible 5 stars.

 

[Bevan]

ya, i'll get a sub, but not for the next year unfortunately. i'm immigrating again in a years time and have to carry all my hifi stuff with me (speakers and cd player as hand luggage, amp as cargo).

you raise an interesting question though. i've read countless times in these forums people asking if their amps are powerfull enough, but i almost never see anyone asking them if they use a sub or not. it must make a big difference. i wonder just how much? if, say in my case, i'm using an 80 watt amp feeding speakers nothing bellow 80hz, what would that equate to if i were using speakers full-range? would the 80W amp have the same controll over the "small" speakers as say a 120 or 150W amp would have over the same speakers set to "large" ? if you follow what i mean.

Electone, any chance of some details on that review? i dont have access to hifi mags where i am.

thanks all

bevan