Have you tried running this un-bridged? Are you getting a lot of output using just one channel? What is the impedance on your speaker?
Impedance matching between pre and power amps
Hi all,
I am trying to put together a Bass Guitar Amp and I am having issues with power output. I am using a Carvin SX-15 Preamp feeding a TDA8954 Power Amp board purchased on Ebay. The power amp is supposed to deliver 210 WPC into a 4 Ohm Load or 420 Watts in BTL (bridged) Mode into an 8 Ohm Load. I am using it in BTL mode for max power. The problem is, If I use just the Carvin, the power output (at full gain) is weak to say the least. I add my Gigpro beltpack preamp and I gain a significant increase in power but still weak. I then added a DBX-1 compressor (with gain at max) between the Carvin and the power amp and with everything at max levels it just starts to show a little power. It seems like I'm just not getting enough signal from the preamp to the power amp. Input impedance of the power amp is 56K Ohms, Output impedance of the preamp is 5.9K Ohms. Is it just a compatibility issue between the amps or can I use a matching transformer between the two to boost the signal to a usable level? For comparison I connect the Carvin and the DBX to a Peavey 350 WPC power amp (using just 1 channel) and I can shake the house and rattle the windows. Does anybody have any input on this issue (good or bad)?
I am trying to put together a Bass Guitar Amp and I am having issues with power output. I am using a Carvin SX-15 Preamp feeding a TDA8954 Power Amp board purchased on Ebay. The power amp is supposed to deliver 210 WPC into a 4 Ohm Load or 420 Watts in BTL (bridged) Mode into an 8 Ohm Load. I am using it in BTL mode for max power. The problem is, If I use just the Carvin, the power output (at full gain) is weak to say the least. I add my Gigpro beltpack preamp and I gain a significant increase in power but still weak. I then added a DBX-1 compressor (with gain at max) between the Carvin and the power amp and with everything at max levels it just starts to show a little power. It seems like I'm just not getting enough signal from the preamp to the power amp. Input impedance of the power amp is 56K Ohms, Output impedance of the preamp is 5.9K Ohms. Is it just a compatibility issue between the amps or can I use a matching transformer between the two to boost the signal to a usable level? For comparison I connect the Carvin and the DBX to a Peavey 350 WPC power amp (using just 1 channel) and I can shake the house and rattle the windows. Does anybody have any input on this issue (good or bad)?
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