Hi Folks,
i recently got on the cheap, two of these Sure AB32321 IRS2092 Boards, the ones with 2x125 Watt.
I noticed that is has an BTL/Stereo switch on the Board and on their page, Sure says that the Board is capable of working with bridge tied load,...but they dont mention either with what minimum load impedance nor what wattage the board would produce.
The Manual clearly states that the board should only ran with minimum impedance from 8 ohms in stereo mode, so what should one assume by using btl?
Did anyone got experience with these specific board, or maybe maybe if, some measurements how it behaves with btl in general?
I mean, thing is that there is no such thing as an really "only" 8 ohms speaker got me thinking, that they had to write something but did not want to go full concrete.
Or i am able to only drive "above" 8 ohms speakers with this borad, to be in the clear? 😛
Swany
i recently got on the cheap, two of these Sure AB32321 IRS2092 Boards, the ones with 2x125 Watt.
I noticed that is has an BTL/Stereo switch on the Board and on their page, Sure says that the Board is capable of working with bridge tied load,...but they dont mention either with what minimum load impedance nor what wattage the board would produce.
The Manual clearly states that the board should only ran with minimum impedance from 8 ohms in stereo mode, so what should one assume by using btl?
Did anyone got experience with these specific board, or maybe maybe if, some measurements how it behaves with btl in general?
I mean, thing is that there is no such thing as an really "only" 8 ohms speaker got me thinking, that they had to write something but did not want to go full concrete.
Or i am able to only drive "above" 8 ohms speakers with this borad, to be in the clear? 😛
Swany
So,
got an Mail which i wrote simultaneously to this thread, to Sure and they replied that the board is interally numbered as [FONT=Calibri, sans-serif]AMP7S - 150, and seems to capable of driving 125 watts into 8 ohms, 250 into 4 ohm (despite the manual says 8 ohms minimum impedance) and should give 500 watts into 8 ohms full bridged.[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Imho, this should all be stats with the 10% THD...[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Just thought i share this, so maybe if someone stumbles upon the same question, will get at least, some answer.[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Greets Swany
[/FONT]
got an Mail which i wrote simultaneously to this thread, to Sure and they replied that the board is interally numbered as [FONT=Calibri, sans-serif]AMP7S - 150, and seems to capable of driving 125 watts into 8 ohms, 250 into 4 ohm (despite the manual says 8 ohms minimum impedance) and should give 500 watts into 8 ohms full bridged.[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Imho, this should all be stats with the 10% THD...[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Just thought i share this, so maybe if someone stumbles upon the same question, will get at least, some answer.[/FONT]
[FONT=Calibri, sans-serif]
[/FONT]
[FONT=Calibri, sans-serif]Greets Swany
[/FONT]
If you are in BTL with two IRS2092, the speaker will see differentially double the voltage it would have in comparison to single-ended configuration. Therefore also the currents will be doubled.
If they designed the amplifier for minimum of 8 ohms, this would mean you can connect a minimum 16 ohms speaker in BTL mode.
However in the end it depends on the selection and the cooling of the mosfets but also how they designed the over-current protection around the IRS2092.
Could you please check which mosfets they used (those are the two 5-pins devices on the heatsink).
If they designed the amplifier for minimum of 8 ohms, this would mean you can connect a minimum 16 ohms speaker in BTL mode.
However in the end it depends on the selection and the cooling of the mosfets but also how they designed the over-current protection around the IRS2092.
Could you please check which mosfets they used (those are the two 5-pins devices on the heatsink).
Last edited: