I am considering an amp project with a new speaker. I am getting a cheap bass amp that is a Drive 20 watt bass amp- AC 117V 60Hz 35W (on back of the amp) that I want to mod into a customized guitar amp for something different. Currently the amp has a no name 8 inch speaker (it is being delivered and I do not yet know the ohm rating) also significant is the speaker is totally enclosed in the cabinet-no open back.
Is there a 10 inch speaker that I may be able to replace the 8 inch speaker that may give me a different sound? What do I need to consider as far as watt ratings in a replacement consideration- do i need to go higher of lower watt ratings if I am not matching exact? Do i need to match the OHMS exact.
Wayne Parham Messages: 18758 Registered: January 2001
Illuminati (33rd Degree)
I wouldn't be overly concerned about impedance, although it wouldn't be hard to match. Measure the DC resistance of the existing speaker with an ohmmeter. Advertised impedance will be about 25% higher. If the voice coil measures 6Ω or so, it's an 8Ω speaker. If the voice coil is around 12Ω, it's a 16Ω driver.
Do find a speaker that will handle the power though. That shouldn't be hard either, because 20 watts isn't a lot of power. But sometimes guitar speakers don't handle a lot either. So make sure the speaker you choose will handle the power.
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