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Old 28th August 2003, 12:45 PM   #1
miguel2 is offline miguel2  Portugal
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Default GC and low sensitivity speakers

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
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Old 28th August 2003, 12:55 PM   #2
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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.
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Old 28th August 2003, 02:20 PM   #3
miguel2 is offline miguel2  Portugal
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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
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Old 28th August 2003, 02:27 PM   #4
protos is offline protos  Greece
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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.
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Old 28th August 2003, 08:39 PM   #5
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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!
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Old 28th August 2003, 11:31 PM   #6
Bricolo is offline Bricolo  France
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what it headroom?
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Old 29th August 2003, 10:02 AM   #7
miguel2 is offline miguel2  Portugal
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peranders, your are NOT playing the Martin Logans with a GC, are you??!!!

Miguel
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Old 29th August 2003, 10:23 AM   #8
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Quote:
Originally posted by miguel2
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.
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