GC and low sensitivity speakers

[miguel2]

I have speakers with a sensitivity of 87db. Impedance is said to be 8 ohms but it falls to 4 ohms in some frequencies.

will a GC work well with these speakers or it would be desirable to build a bridged version?

I have a GC right now that sounds good but I would like to have some opinions before trying a bridged version, with only 2 chips per channel.

And please dont tell me to buy new speakers $$$

Miguel

 

[peranders]

You will get 104.8(!) dB. Is that enough?

Bridged amp 107 dB

and 4 pcs. LM3386 like the "Das Modul" 110 dB BUT with good cooling.

 

[miguel2]

hi peranders,

I know from experience that it can go loud. But what about control over the speakers? Wouldnt a bridged version have a easier life with these speakers and take the transients better (both in volume and in frequency vs impedance)?

Miguel

 

[protos]

It would probably take less time to build a prototype of the two versions you are talking about than to philosophise about which might be better.

 

[peranders]

If you want to play "disco" one Gainclone isn't much. You will not have so much "headroom" but I have no idea how loud you usually have.

My little VU-meter goes from 0.001-100 watts with 3 dB resolution and with my Martin Logan speakers I have disco at 10 watts in average, 100 W peak. Normal active level is around 1 W, peak 10W!

 

[Bricolo]

what it headroom?

 

[miguel2]

peranders, your are NOT playing the Martin Logans with a GC, are you??!!!

Miguel

 

[peranders]

peranders, your are NOT playing the Martin Logans with a GC, are you??!!!

Miguel

No but I would really like to test it. I'm using my QRO Mosfet amp, similar to Crescendo but I have added some extra features.

I have got samples of LM3866TF and will maybe design a Gainclone.

headroom = how much power you have more than you already are using. It's good to have 5-10 dB more power so you can avoid clipping.