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Linnea
04-11-2008, 05:39 PM
Hi,

What about this speakers system?http://www.audiokarma.org/forums/images/smilies/yikes.gif

Cabinet rearloaded folder horn: JBL C435
High frequency drivers: JBL 2420
High frequency horns: JBL 2345
Mid/bass frequency: JBL 130A
crossover: 800 hz

I want make by a craftsman this loudspeakers.http://www.audiokarma.org/forums/images/smilies/screwy.gif
I think will use a low power integrated tube amplifer or SS class A.

Tks
Nedohttp://www.audiokarma.org/forums/images/smilies/scratch2.gif

Linnea
04-13-2008, 03:29 PM
no one ?
:dont-know

rgrjit8
04-14-2008, 09:12 PM
no one ?
:dont-know

Build it, and they will come.

jcrobso
11-03-2008, 11:43 AM
Hi,

What about this speakers system?http://www.audiokarma.org/forums/images/smilies/yikes.gif

Cabinet rear loaded folder horn: JBL C435
High frequency drivers: JBL 2420
High frequency horns: JBL 2345
Mid/bass frequency: JBL 130A
crossover: 800 hz

I want make by a craftsman this loudspeakers.http://www.audiokarma.org/forums/images/smilies/screwy.gif
I think will use a low power integrated tube amplifer or SS class A.

Tks
Nedohttp://www.audiokarma.org/forums/images/smilies/scratch2.gif

I got the plans from JBL for the C435 and made a pair of them.
I put in my D140F speakers. Then added LE175 driver with horn(at 1200hz) & lens and later added 075 HF drivers. John

jcrobso
11-26-2008, 11:23 AM
I got the plans from JBL for the C435 and made a pair of them.
I put in my D140F speakers. Then added LE175 driver with horn(at 1200hz) & lens and later added 075 HF drivers. John

http://www.lansingheritage.org/html/jbl/specs/home-speakers/1957-c40.htm
Here is the cabinets I made. John

demon
11-26-2008, 11:23 PM
I think will use a low power integrated tube amplifer or SS class A.
i would use something high-power. in my ears (heart), headroom is clearly audible. no matter about needing it...
(alone the word "low-power" makes me kinda sad)

hope you have good results soon.
and dont forget the pictures!

cheers,
mikey

spkrman57
11-27-2008, 09:51 AM
I am a fan of Single-ended tube amps and with 130A and 2420 cd on horn is close to 100db/watt.

How much power do you need for the typical home environment???

My amps are less than 8 wpc and still reach over 100db levels in my living room!

Just my 2 cents worth of course!

Ron

Beowulf57
11-27-2008, 10:56 AM
I am a fan of Single-ended tube amps and with 130A and 2420 cd on horn is close to 100db/watt.

How much power do you need for the typical home environment???

My amps are less than 8 wpc and still reach over 100db levels in my living room!

Just my 2 cents worth of course!

Ron

:thmbsup: Yup...I run my back-loaded folded corner horns with D130, LE85/HL92, 2405H and with a measured 1 watt input, most people want to leave the room...and that's peak power, not average. Now if you have an enormous room, you may want more. My mono-block tube amps run fully balanced from input to output, Class A, with tube regulated power supplies and use DHT's (6B4G's) in a PP configuration. Probably good for around 12-15 watts, but I've never used the headroom, though it's good to have it.

jcrobso
12-02-2008, 11:35 AM
:thmbsup: Yup...I run my back-loaded folded corner horns with D130, LE85/HL92, 2405H and with a measured 1 watt input, most people want to leave the room...and that's peak power, not average. Now if you have an enormous room, you may want more. My mono-block tube amps run fully balanced from input to output, Class A, with tube regulated power supplies and use DHT's (6B4G's) in a PP configuration. Probably good for around 12-15 watts, but I've never used the headroom, though it's good to have it.
Keep in mind that for every 3db increase in SPL the amp power in doubled.
1 watt becomes 2 watts, 2 watts becomes 4, etc.
In music listing we care about the peaks, even thought the average may be one watt, a 10db musical transient needs 10watts of power to be reproduced accurately. You may be using your heard room more than you know.:) John

spkrman57
12-02-2008, 11:55 AM
I found my typical average wattage for normal listening to be using about 1/2 wpc.

So I guess with 8 wpc I have sufficient headroom.

At least I know it sounds good to me. And definitely sounds better than using SS amps with 10 times the power capability.

Ron

Beowulf57
12-05-2008, 06:20 AM
Keep in mind that for every 3db increase in SPL the amp power in doubled.
1 watt becomes 2 watts, 2 watts becomes 4, etc.
In music listing we care about the peaks, even thought the average may be one watt, a 10db musical transient needs 10watts of power to be reproduced accurately. You may be using your heard room more than you know.:) John

Nope...as I noted the 1 watt was peak...average was around 120mw (using a min/max/average reading digital multimeter spec'd to 20KHz).