You can add as many preamps as you like in as many configurations as you want. As long as your power amplifiers are limited by their power supply and as long as your speakers are not up to the task, you will never get satisfying bass performance.
Invest your money in the power supply and speakers instead of a preamplifier. Get decent woofers and find out their T/S parameters. Then build a fitting enclosure, so that they can deliver sufficient SPL in the low region. Your 8"-unknown origin-unknown parameter speaker that is probably not even a woofer in an enclosure that is not even remotely adapted to it will never perform satisfactorily.
Invest your money in the power supply and speakers instead of a preamplifier. Get decent woofers and find out their T/S parameters. Then build a fitting enclosure, so that they can deliver sufficient SPL in the low region. Your 8"-unknown origin-unknown parameter speaker that is probably not even a woofer in an enclosure that is not even remotely adapted to it will never perform satisfactorily.
@pacificblue, You are the person who realise my pain and you have a solution for that. I am very thankfull to you. I read your post very carefully.
I remember you had told me to use multiple transformer to enhance the power supply ( Still I could not do it. )
"BOLTON" subwoofer is a reputed brand in my place. But seller is not interested to tell T/S parameters OR even he does not know.
Many Thanks gfiandy for best links
Thanks AndrewT, I have saved your post which will be usefull to me in future.
Thanks & Regards
I remember you had told me to use multiple transformer to enhance the power supply ( Still I could not do it. )
"BOLTON" subwoofer is a reputed brand in my place. But seller is not interested to tell T/S parameters OR even he does not know.
Many Thanks gfiandy for best links
Thanks AndrewT, I have saved your post which will be usefull to me in future.
Thanks & Regards
I am using SINGLE POWER SUPPLY 12-0 5 Amp, bridge rectifier, 4700uf 25v two Caps, which delivers 16 V (approx)
Expert memeber says I should improve my PSU i.e. I should use bigger transformer. My supplier does not have more than 5 Amp transformer for 12-0
I have to use 12-0 & 10 Amp transformer.
Can I use TWO 12-0 5 Amp transformers, TWO bridges rectifier, FOUR 4700UF 25 v Caps, IF YES, HOW ?
With this can I get desired power ?
Expert memeber says I should improve my PSU i.e. I should use bigger transformer. My supplier does not have more than 5 Amp transformer for 12-0
I have to use 12-0 & 10 Amp transformer.
Can I use TWO 12-0 5 Amp transformers, TWO bridges rectifier, FOUR 4700UF 25 v Caps, IF YES, HOW ?
With this can I get desired power ?
You can connect transformers in parallel. Make sure that they are the same type, same manufacturer. That way you can be sure that they have the same short-circuit voltage and none gets overloaded.
If you don't get two of the same type, distribute the power amplifiers, so that each transformer powers about half of them. Your old transformer can then be used for a symmetric power supply for your preamplifier and cross-overs.
You will get some more power, but you will still have to do something about the subwoofer.
After googling a bit about Bolton woofers, they all seem to be high Qts types, so you will need a very big closed box to make them perform well. Something like 100 l or more. Make it as stiff as possible.
Alternatives could be a transmission line enclosure or open baffle. Transmission line is more difficult to build and takes some time to get the filling right. Open baffle could suffer from efficiency, but would be the easiest way to test, whether the frequency response improves with more air in the back.
If you don't get two of the same type, distribute the power amplifiers, so that each transformer powers about half of them. Your old transformer can then be used for a symmetric power supply for your preamplifier and cross-overs.
You will get some more power, but you will still have to do something about the subwoofer.
After googling a bit about Bolton woofers, they all seem to be high Qts types, so you will need a very big closed box to make them perform well. Something like 100 l or more. Make it as stiff as possible.
Alternatives could be a transmission line enclosure or open baffle. Transmission line is more difficult to build and takes some time to get the filling right. Open baffle could suffer from efficiency, but would be the easiest way to test, whether the frequency response improves with more air in the back.
How can I connect transformers in parallel. When it is same type and same mfg. Please post schematic/circuit.
Thank you & Regards.
Hi,
is 16Vdc sufficient?
That allows the same peak output voltage as +-8Vdc.
Most pre-amps run @ >=+12Vdc and some over +-24Vdc.
is 16Vdc sufficient?
That allows the same peak output voltage as +-8Vdc.
Most pre-amps run @ >=+12Vdc and some over +-24Vdc.
pra3718 said:
Choose F1 big enough to avoid convenience blowing, but small enough to ensure short-circuit protection. Choose F2 and F3 according to the transformers nominal output current. All three are slow-blow. Add fuses for the amplifiers as necessary. Consider wire protection with slow-blow fuses, speaker and component protection with fast fuses.
pra3718 is using several car amplifier ICs, some of them bridged, so he needs 12..18 V single supply for them. He owns a 12-0-12 V transformer, half of which is now used for pre and power amplifiers. After buying his new 12 V single secondary transformers, he can put the 12-0-12 V to use for a split supply for his preamp and active crossover.AndrewT said:
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