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Multi-Way Conventional loudspeakers with crossovers

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Old 11th April 2019, 04:12 AM   #2651
perceval is offline perceval  Taiwan
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Indeed! Looks great. Nice design, and I also believe it would score WAF points.

But, if you are already using the miniDSP, why do you need the T-Bass circuit?
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Old 11th April 2019, 07:03 AM   #2652
bzfcocon is offline bzfcocon  Romania
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Thanks !

Quote:
Originally Posted by perceval View Post
But, if you are already using the miniDSP, why do you need the T-Bass circuit?
This has been a long and heated debate in the original T-Bass thread, with Graham arguing that T-Bass does something you cannot do with EQ alone, namely compensating the time-domain transient response of the large woofer + amplifier combo. The details are in 'T'-bass drive for OB LF drivers.

Personally, I do feel that there is somethig audible to it, so I'm using it together with miniDSP.
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Old 11th April 2019, 08:23 AM   #2653
perceval is offline perceval  Taiwan
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Thanks,

I'll have a read over there, but time and phase alignment could be done using RePhase and the FIR filter import in the miniDSP.
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Old 11th April 2019, 09:10 PM   #2654
korpberget is offline korpberget  Norway
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Bzfcocon do you have a schematic or some values for your T-bass circuit?
Read the whole tread. Tempted to do a test myself.

Big caps must also be bipolar, right?
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Old 11th April 2019, 09:42 PM   #2655
bzfcocon is offline bzfcocon  Romania
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Quote:
Originally Posted by korpberget View Post
Bzfcocon do you have a schematic or some values for your T-bass circuit?
The schematic is on the first page of the thread. For the Beta 15As I use the following values:
L = 6.8 ohm, 0.26 ohm ferrite core
R1, R1 = 1 ohm
C = 330uF (bipolar) - I am cutting higher
Transformes are toroids, 250 VA 2x 18V (only the secondary is used)

I don't use the low pass filter on the right part of the schematic - that is optional and can be replaced by DSP/crossover.

Warning: you MUST use a 4 ohm capable amplifier. The impedance of the assembly is low. But it does not have to be an expesive one and you don't need a lot of power: with OB you typically run out of Xmax long before you run out of power. I'm using a good old HK 620 and it does the job just great (even at somewhat higher SPLs)
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Last edited by bzfcocon; 11th April 2019 at 09:48 PM.
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Old 17th April 2019, 11:51 AM   #2656
korpberget is offline korpberget  Norway
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Thanx! Trying it out now. NAD C270. Sorry for treadjacking.
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