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Nelson Pass F5 or F5T
Nelson Pass F5 or F5T
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Old 19th June 2019, 09:05 AM   #1
Martypilot is offline Martypilot
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Default Nelson Pass F5 or F5T

Hello everybody, Iím totalt new to this forum and in need of your advice.
I have borrowed a Nelson Pass DIY F5 from my brother and used it to drive my JBL blue baffles 4333A and it sounds amazing. TheJBLís have horns, a 15Ē woofer and have an efficiency of 93db. Its only 25W in class A but I canít really say that it is lacking in power even at really high sound levels. I have now started the research which of the F5ís I should build, the F5 or the F5T.

How much more would the F5T cost to build compared to the regular F5?

Is there a sound difference between the two and would the F5T give a bigger sound stage?

Any other thoughts or suggestions?

Best regards, Martin
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Old 19th June 2019, 11:49 AM   #2
WKCox is online now WKCox  United States
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Nelson Pass F5 or F5T
Don't know how big your listening room is or your typical listening levels, but I would be hard-pressed to believe that the F5 wouldn't be able to provide more than enough power. The F5T would provide more power but sound stage should be the same.

Suggest looking at this thread to assess your needed power levels for your JBLs.

A Test. How much Voltage (power) do your speakers need?
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Old 19th June 2019, 01:21 PM   #3
BigE is online now BigE  Canada
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If the impedance of the speaker is 4 ohms, go F5T. If 8 go F5.
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Old 19th June 2019, 01:32 PM   #4
vdi_nenna is online now vdi_nenna  United States
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Nelson Pass F5 or F5T
With 93db speakers, F5 is plenty. You gain 3db with F5T v2 and 6db with 100W mono F5T v3. With just a standard F5 at 8w, you are at 102db. Get a db meter or an app for phone and see at which level you like listening.

Quote:
How much more would the F5T cost to build compared to the regular F5?
Referencing DIYAudio store chassis'.

Depends on a few things. Which version of the F5T are you interested in?
A stereo F5T v2 in a 5U chassis will cost considerable less than 100W mono blocks v3 in a 5U chassis'. You could go with a single power supply in the F5T v2, but dual-mono is better.

You can build a F5 in a 4U chassis; also the F5T v1 with added mosfets on the output, keeping in mind that you will have to watch the bias level to keep the heat sink temp and mosfets in a safe range.

Dual-mono and mono-blocks are a lot of work, but that's entirely up to you and how far you are willing to go.

In case you are wondering, the sound of a F5T is more relaxed than a standard F5. I've built two F5s, 50w F5T v2 dual-monos and heard 100w mono-blocks. Newer standard F5 boards have a P3 adjustment, so you might be able to tweak the sound a bit around 2nd and 3rd harmonic.

Good luck!
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Old 19th June 2019, 01:46 PM   #5
Zen Mod is offline Zen Mod  Serbia
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Nelson Pass F5 or F5T
my vote for M2 - it'll sound divine with that JBLs

and super easy to make , no other setting than output DC offset...... say dual mono , preferably in 4U/400 case ( more space than in usual 4U/300 Store jobbie)

amp from heaven for horn speakers

for my ears (of comparable amps) only Babelfish M25 and of course SissySIT are better , but count that I'm heavily biased ..... and all Greedy Boyz know that I'm World's Greatest M2 Advocate

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Old 19th June 2019, 01:54 PM   #6
vdi_nenna is online now vdi_nenna  United States
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Nelson Pass F5 or F5T
Quote:
my vote for M2 - it'll sound divine with...
Yeah, the M2 sound really stick with you. After borrowing one a long time ago, I still think about it.
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Old 19th June 2019, 02:38 PM   #7
Hikari1 is offline Hikari1  United States
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If 25w is enough for you and speakers are 8ohm then definitely standard f5.

F5T sounds different, feedback is different. Standard F5 sounds more forward and lively.

Iíve done both. I need the wattage so I choose f5T. If I didnít need the wattage I would choose f5.
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Old 20th June 2019, 06:16 AM   #8
Martypilot is offline Martypilot
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Thanx for all info and advices!!!

The speakers are 8ohm speakers so Iíll focus my future build towards the regular F5 or maybe the M2.

The room is 4 X 10 meters in size (13í X 33í).

Is I mentioned earlier I tried my brothers regular F5 with my setup and I can tell it has enough power to drive my system, even at high volyme. It is odd though that 25W is enough when those 15Ē woofers. They normally needs at least 200W from a high end amplifier to get full control.

Once again thanx for your help!

/ Martin
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Old 20th June 2019, 07:20 AM   #9
Zen Mod is offline Zen Mod  Serbia
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Nelson Pass F5 or F5T
FW is simply higher end

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Old 20th June 2019, 12:13 PM   #10
McQuaide is online now McQuaide  United States
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I use a standard F5 with a bit more bias, my speakers are 90db efficiency at 4 ohms in a large room. There is plenty of power available, as you've found with your borrowed F5.
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