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Old 9th June 2012, 04:11 AM   #81
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Hey Apex audio

can i use this gain clone to run this type of speakers at home?
what is the sensitivity of input?
how much input signal voltage required to get full power output?
JBL GT6-S266
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Old 9th June 2012, 12:22 PM   #82
AndrewT is online now AndrewT  Scotland
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Ch,
there are no sensitivity nor impedance data in that link.
What is the speaker impedance?
What is the speaker sensitivity?
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Old 9th June 2012, 01:53 PM   #83
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Quote:
Originally Posted by AndrewT View Post
Ch,
there are no sensitivity nor impedance data in that link.
What is the speaker impedance?
What is the speaker sensitivity?
Hi! Andrew

You have to scroll down to see the specifications of the speaker
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Last edited by charlestpt; 9th June 2012 at 01:55 PM.
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Old 9th June 2012, 01:56 PM   #84
AndrewT is online now AndrewT  Scotland
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93dB means nothing to me.
4ohms tells me it is not really suitable for chipamp power. Not enough current capability from chipamps.
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Old 9th June 2012, 02:01 PM   #85
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Quote:
Originally Posted by AndrewT View Post
93dB means nothing to me.
4ohms tells me it is not really suitable for chipamp power. Not enough current capability from chipamps.
Hi Andrew

93dB does not sufficient for home listening?? Then tell me how much SPL should be required for home listening

and LM3886 doesn't support 4ohms load??
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Old 9th June 2012, 02:05 PM   #86
AndrewT is online now AndrewT  Scotland
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93dB means nothing.
That is not a specification, that is a ratio, nothing more.

Look up chipamp current capability.
You will find that all are current crippled. They can drive >=4r0 resistive test loads. They have insufficient current capability to meet the demand of a real 4ohms speaker.
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Old 9th June 2012, 02:35 PM   #87
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Quote:
Originally Posted by AndrewT View Post
93dB means nothing.
That is not a specification, that is a ratio, nothing more.

Look up chipamp current capability.
You will find that all are current crippled. They can drive >=4r0 resistive test loads. They have insufficient current capability to meet the demand of a real 4ohms speaker.
How much will you prefer
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Old 9th June 2012, 06:39 PM   #88
SoIL4x4 is offline SoIL4x4  United States
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Quote:
Originally Posted by AndrewT View Post
You will find that all are current crippled. They can drive >=4r0 resistive test loads. They have insufficient current capability to meet the demand of a real 4ohms speaker.
This is disappointing to say the least, I am in the process of collecting parts for a lm3886 based amplifier that is going to be used with 4ohm speakers
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Old 9th June 2012, 06:54 PM   #89
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Quote:
Originally Posted by charlestpt View Post
93dB does not sufficient for home listening?? Then tell me how much SPL should be required for home listening

and LM3886 doesn't support 4ohms load??
Most speaker manufactors show very optimistic technical data. As this a car speaker, the 93 dB can relate to a distance of 0.5 meter. Nominal impedance is 4 ohm, 2.83 V is than 2 W.

A chipamp based on LM 3886 can drive a 4 ohm load. I could be adviceable to use a slightly lower supply voltage.
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Old 9th June 2012, 07:40 PM   #90
SoIL4x4 is offline SoIL4x4  United States
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Quote:
Originally Posted by RogerGustavsson View Post
A chipamp based on LM 3886 can drive a 4 ohm load. I could be adviceable to use a slightly lower supply voltage.
I used a 22v transformer for my lm4780 build as recommended with the intention of using it with a 6ohm pair of speakers and a 4ohm pair. It seems to me Andrew is saying that these chips cannot be used with 4ohm speakers no matter what amount of voltage is applied.

P.s. I am listening to my lm4780 with 4ohm klipsch kg4s right now and it sounds delightful. Some more discussion or explanation of this topic would be appreciated.

Last edited by SoIL4x4; 9th June 2012 at 07:44 PM.
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