Adding bass to an F5?

BigE · 20th July 2011, 07:00 PM

A buddy of mine built an F5, and is having problems with getting enough bass out of larger speakers, like watson lab model 10, tannoy dmt215, maggie 1.6. for example, Bjork's "All is full of love" has tons of deep bass that reaches out and blooms into the room with my modified Phase linear 400 and watson lab model 10. With his f5, the bass never leaves the speakers -- no bloom at all. This track is known for it's insanely rich and room filling bass.

He's hotrodded it to a higher bias, and claims 38 wpc.

He's got 37,000 uF Kendial caps in it, and a 400 VA toroid.

Are the caps bass shy, or is it just that the speaker needs more power? Can he achieve his goal of room filling bass by increasing PS capacitance?

Thank you.

Zen Mod · 20th July 2011, 09:20 PM

let him make hot-rodded F5

you'll find that as cascoded or full blast F5

input is cascoded , outputs doubled

Itsmee · 20th July 2011, 11:39 PM

Quote:

Originally Posted by BigE

He's got 37,000 uF Kendial caps in it

Is that total or per rail?

It may need to settle in, give it 100 hours use before changing anything.

Botte · 21st July 2011, 12:45 PM

Try a .47ohm resistor in series with each speaker. This will add some bloom to the base as it lowers the damping factor.

flg · 21st July 2011, 01:07 PM

No one has mentioned any testing of the amp? Try testing freq response into an 8 ohm resistor. Is it the amp or the load?

BigE · 21st July 2011, 01:53 PM

Quote:

Originally Posted by Itsmee

Is that total or per rail?

It may need to settle in, give it 100 hours use before changing anything.

Per rail. It should be settled in by now.

BigE · 01:58 PM

Quote:

Originally Posted by Botte

Try a .47ohm resistor in series with each speaker. This will add some bloom to the base as it lowers the damping factor.

Interesting, I'll pass it on.

BTW: What wattage of resistor?

Botte · 21st July 2011, 03:56 PM

Quote:

Originally Posted by BigE

Interesting, I'll pass it on.

BTW: What wattage of resistor?

5 Watt should do it.

Russellc · 21st July 2011, 05:36 PM

Quote:

Originally Posted by Zen Mod

let him make hot-rodded F5

you'll find that as cascoded or full blast F5

input is cascoded , outputs doubled

I have the Cviler boards for double outputs. With them plus cascoded front end, what is max rail voltage (for good effect, not absolute max) and bias? assuming plenty of sink...

Russellc

Russellc · 21st July 2011, 05:46 PM

My F-5, standard single pair outputs, standard rail voltage and bias (but dual mono with 2 300VA transformers) playing into JBL 2235H in 5 cu ft tuned to 32 hz, b&C DE 250 compression driver with QSC wave guide has Bass, Bass all over the place....

Russellc

20th July 2011, 07:00 PM	#1
BigE diyAudio Member Join Date: Aug 2008 Location: Toronto	Adding bass to an F5? A buddy of mine built an F5, and is having problems with getting enough bass out of larger speakers, like watson lab model 10, tannoy dmt215, maggie 1.6. for example, Bjork's "All is full of love" has tons of deep bass that reaches out and blooms into the room with my modified Phase linear 400 and watson lab model 10. With his f5, the bass never leaves the speakers -- no bloom at all. This track is known for it's insanely rich and room filling bass. He's hotrodded it to a higher bias, and claims 38 wpc. He's got 37,000 uF Kendial caps in it, and a 400 VA toroid. Are the caps bass shy, or is it just that the speaker needs more power? Can he achieve his goal of room filling bass by increasing PS capacitance? Thank you.

20th July 2011, 09:20 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	let him make hot-rodded F5 you'll find that as cascoded or full blast F5 input is cascoded , outputs doubled __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

21st July 2011, 01:07 PM	#5
flg diyAudio Member Join Date: Jul 2005 Location: North East	No one has mentioned any testing of the amp? Try testing freq response into an 8 ohm resistor. Is it the amp or the load? __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

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21st July 2011, 12:45 PM	#4
Botte diyAudio Member Join Date: Mar 2004 Location: MN	Try a .47ohm resistor in series with each speaker. This will add some bloom to the base as it lowers the damping factor.

21st July 2011, 05:46 PM	#10
Russellc diyAudio Member Join Date: Mar 2003 Location: midwest	My F-5, standard single pair outputs, standard rail voltage and bias (but dual mono with 2 300VA transformers) playing into JBL 2235H in 5 cu ft tuned to 32 hz, b&C DE 250 compression driver with QSC wave guide has Bass, Bass all over the place.... Russellc

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