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-   -   jbl 2245h amplified by F4 (http://www.diyaudio.com/forums/subwoofers/234542-jbl-2245h-amplified-f4.html)

rosario 21st April 2013 12:05 AM

jbl 2245h amplified by F4
 
Hello people i want to ask if anybody know if nelson pass F4 in bridge can be the amplifier for jbl 2245h without an preamplifier ? I put the 2245h in open baffle and i guess the F4 doesn't have enough power or this 2245h must need an enclosure to sound?

Thx for reply's , greetings from Romania.

Zen Mod 21st April 2013 12:27 AM

no need for preamplifier ........ if you are having potent source

:devily:

what power you need generally for that speaker ?

then we can calc backwards what voltage swing you need

rosario 21st April 2013 01:24 AM

I have yamaha da202 dac but in the future i want to use this dac to split signal to the F4 and also to aleph j. i want to use the F4 for 2245h and aleph j for jbl L16 decade speakers and bx63a crossover clone between dac and F4. is a good idea?

Zen Mod 21st April 2013 02:14 AM

F4 is not having voltage gain

rosario 21st April 2013 07:40 AM

i need to make an preamp for it in this cause? can i modified the bx63a to have some voltage?

bjorno 21st April 2013 12:27 PM

1 Attachment(s)
Quote:

Originally Posted by rosario (Post 3462529)
i need to make an preamp for it in this cause? can i modified the bx63a to have some voltage?

Hi rosario,

Here is an idea:

b:)

scholl 21st April 2013 01:26 PM

subamp
 
Not sure how the F4 would drive that woofer. You'll have to try it to find out. Odviously you like low power amplifiers. In applications like this sometimes more power and damping sound better than a sweet little amp. As well all know synergy comes in all forms. YMMV

SY 21st April 2013 02:16 PM

Given the low Qts, this is not a particularly good speaker for open baffle without a lot of EQ.

rosario 21st April 2013 10:56 PM

thx bjorno for this schematic , i tested in open baffle but it will have a enclosure. another thing about bx63a can i make the output balanced even the input to have some decibels more, it worth?

bjorno 22nd April 2013 04:07 PM

Quote:

Originally Posted by rosario (Post 3463327)
thx bjorno for this schematic , i tested in open baffle but it will have a enclosure. another thing about bx63a can i make the output balanced even the input to have some decibels more, it worth?


Agree, The driver is not well suited for an OB..What size and type of Box are you planning?

Regarding the Amplifier question:
Of course you can design a balanced output low Ohm buffer as you gain the double Voltage swing to feed the F4 but there would be an insertion loss at the F4 Receiver end if not made 'higher Ohmic' balanced to single end.
This is not a problem if you design a balanced input circuit using an Op-Amp like the already used TL07X amps in differential mode.

b:)


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