Hello,
I'm hoping someone can help me get more volume out of my current class-d bass amp build.
I have an IRS2092 mono amplifier board being powered by an abeltec 53v smps. I run the instrument line through a passive tone board and into the amp.
The signal output drives a 15" 8ohm speaker (old peavey tnt cab).
Amp: IRS2092 Mono Digital Amplifier Board 2 0 Audio Class D DC Power Supply 350W | eBay
Tone board: Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay
The output is nice and clean, but not very loud. If I disconnect the passive tone board and go direct to the amp, I get a bit more volume.
I'm wondering if I need a preamp to boost the instrument level before or after the passive tone board.
Any tips?
Thanks in advance!
I'm hoping someone can help me get more volume out of my current class-d bass amp build.
I have an IRS2092 mono amplifier board being powered by an abeltec 53v smps. I run the instrument line through a passive tone board and into the amp.
The signal output drives a 15" 8ohm speaker (old peavey tnt cab).
Amp: IRS2092 Mono Digital Amplifier Board 2 0 Audio Class D DC Power Supply 350W | eBay
Tone board: Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay
The output is nice and clean, but not very loud. If I disconnect the passive tone board and go direct to the amp, I get a bit more volume.
I'm wondering if I need a preamp to boost the instrument level before or after the passive tone board.
Any tips?
Thanks in advance!
Okay, so after spending a ton of time researching this stuff.
I think I can use a Jack Orman Mosfet Booster to do what I want.
I think I can use a Jack Orman Mosfet Booster to do what I want.
Maybe. But I find his input capacitor and resistor values inappropriate. His 0.001uF capacitor coupled with a 10M input resistor will roll off the low 'E' of a bass by about 2 db. A 0.1uF capacitor with a 1M resistor would be far better---enough input impedance to not load the bass pickup, but low enough to limit unnecessary noise.
Hi Guys
Actually, bass rolloff is often good to avoid a flatulent sound.
A power amp requires an active preamp to achieve its full output. For any given signal level a guitar will seem louder than a bass because the guitar's frequencies are easier for us to hear and brighter tones always seem louder. ANY preamp you add will likely be an improvement.
The limiting factor of your system is the speaker and its cabinet. A second cabinet spaced apart from the first will give you much louder perceived sound due to the fact there are two sound sources and our brain-ears work as a phase differentiator. Even though the electrical signal is identical to both cabinets, the acoustic signals will be perceived as different, and the sound will seem to come from between the speakers and be louder than if they are clustered.
Be warned that as the sound is made louder your own aural compression kicks in ever more to round and compress the perceived sound - what you think you are hearing is not accurate.
Have fun
Actually, bass rolloff is often good to avoid a flatulent sound.
A power amp requires an active preamp to achieve its full output. For any given signal level a guitar will seem louder than a bass because the guitar's frequencies are easier for us to hear and brighter tones always seem louder. ANY preamp you add will likely be an improvement.
The limiting factor of your system is the speaker and its cabinet. A second cabinet spaced apart from the first will give you much louder perceived sound due to the fact there are two sound sources and our brain-ears work as a phase differentiator. Even though the electrical signal is identical to both cabinets, the acoustic signals will be perceived as different, and the sound will seem to come from between the speakers and be louder than if they are clustered.
Be warned that as the sound is made louder your own aural compression kicks in ever more to round and compress the perceived sound - what you think you are hearing is not accurate.
Have fun
I'd say if you have to have a bass rolloff in your bass amp to 'avoid a flatulent sound', you need a new speaker!!!
What a musician THINKS he hears IS accurate----measurements be damned! Not to say we shouldn't measure things (we must), but what it SOUNDS like is much more important than what we measure. If the two disagree, we're measuring the wrong thing.
Hi Guys
dotneck I never said anything about measurement rather perception. This is all true.
Even playing quietly so aural compression is not noticeably invoked, you can stand in front of the cabinet and hear a bright, move to either sound and hear a rounder sound, move further away but in front of the cabinet and hear a brighter sound. This has to do with the beaming of high frequencies and is a real phenomenon. When you start playing louder aural compression kicks in to a greater degree and your perception of the sound is that it is rounder regardless of where you stand.
The truth is that at the point where your hearing is compressing the sound, you are NOT hearing an accurate sound nor is your impression of it accurate.
No measurements required.
You can certainly have extended low-frequency response with the right speakers and cabinets, but is it of any benefit?
Low-frequency rumble bleeds into every mic on stage and is the bain of sound men everywhere. Just as bad for them is the high-frequency bleed of cymbal "sizzle". When play by yourself you tend to want to have the wall-of-sound, which contradicts the requirement as a BAND MEMBER where each instrument should fit into its own space leaving space for others. Anything you do to tighten up your tone gives you a better tone to start and also is much more band-friendly.
Have fun
dotneck I never said anything about measurement rather perception. This is all true.
Even playing quietly so aural compression is not noticeably invoked, you can stand in front of the cabinet and hear a bright, move to either sound and hear a rounder sound, move further away but in front of the cabinet and hear a brighter sound. This has to do with the beaming of high frequencies and is a real phenomenon. When you start playing louder aural compression kicks in to a greater degree and your perception of the sound is that it is rounder regardless of where you stand.
The truth is that at the point where your hearing is compressing the sound, you are NOT hearing an accurate sound nor is your impression of it accurate.
No measurements required.
You can certainly have extended low-frequency response with the right speakers and cabinets, but is it of any benefit?
Low-frequency rumble bleeds into every mic on stage and is the bain of sound men everywhere. Just as bad for them is the high-frequency bleed of cymbal "sizzle". When play by yourself you tend to want to have the wall-of-sound, which contradicts the requirement as a BAND MEMBER where each instrument should fit into its own space leaving space for others. Anything you do to tighten up your tone gives you a better tone to start and also is much more band-friendly.
Have fun
Well, there is a difference between low frequency response (flat at 41Hz---'low E) that is musically desirable and 5-10 Hz rumble that is just NOISE. Eh?
Hi Guys
Most mixing consoles you see will have all the channels defaulted to a 100Hz high-pass, especially in live situations.
As a player, you should realise that it is actually the harmonics of those lower notes that count, and that "make" the note for everyone else. There will be enough energy in the room to activate all the room resonances without true full power to the lowest fundamental on your instrument. This is not to say for a recording you should not record the fundamental, but in live work it needs rolling off.
Have fun
Most mixing consoles you see will have all the channels defaulted to a 100Hz high-pass, especially in live situations.
As a player, you should realise that it is actually the harmonics of those lower notes that count, and that "make" the note for everyone else. There will be enough energy in the room to activate all the room resonances without true full power to the lowest fundamental on your instrument. This is not to say for a recording you should not record the fundamental, but in live work it needs rolling off.
Have fun
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