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PI 4 Upgrades [message #93581] Wed, 21 April 2021 14:43 Go to next message
docjrev is currently offline  docjrev
Messages: 6
Registered: February 2021
Esquire
Hi Wayne,
What improvement can I make to my 4 Pi just because. I already have the newer horns, JBL woofers, B&C tweeters, all Mills resistors, all Jantzen capacitors or should I just calm down and just listen to my Pi 4s as what I've been doing for the last ten years? Sorry for the rant. Thanks Wayne and Godspeed. Razz
Re: PI 4 Upgrades [message #93582 is a reply to message #93581] Wed, 21 April 2021 17:55 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18155
Registered: January 2001
Illuminati (33rd Degree)

If you have the H290C waveguide, it sounds like you're upgraded as far as you can go, at least as far as "factory upgrades" are concerned. You could replace the B&C driver with a TAD TD-2002, but I've never offered it because of the price. It isn't just "audio jewelry" though - its beryllium diaphragm provides extended HF without breakup modes in the top octave.

One other thing I might mention is multisubs. The four Pi design really benefits from at least a pair of flanking subs. Better still is to have a pair of flanking subs and a pair of distributed subs, placed further away and setup as multisubs.

So that gives you upgrade possibilities for both ends of the audio spectrum.
Re: PI 4 Upgrades [message #93588 is a reply to message #93582] Thu, 22 April 2021 10:34 Go to previous messageGo to next message
docjrev is currently offline  docjrev
Messages: 6
Registered: February 2021
Esquire
Thanks Wayne. I already employed 4 SVS subs with my PI 4. As for the TAD compression drivers, they are unobtanium at present. Any suggested substitute, say around or below $2000 range per pair, will be greatly appreciated. Godspeed.
Re: PI 4 Upgrades [message #93589 is a reply to message #93588] Thu, 22 April 2021 11:57 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18155
Registered: January 2001
Illuminati (33rd Degree)

Have you tried the JBL 2426H?
Re: PI 4 Upgrades [message #93590 is a reply to message #93589] Thu, 22 April 2021 14:44 Go to previous messageGo to next message
docjrev is currently offline  docjrev
Messages: 6
Registered: February 2021
Esquire
Thanks Wayne. I will investigate. Are the JBLs bolt pattern compatible with the H290c? Godspeed.
Re: PI 4 Upgrades [message #93591 is a reply to message #93590] Thu, 22 April 2021 15:15 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18155
Registered: January 2001
Illuminati (33rd Degree)

No, they're not. You'll have to drill the H290C. When I had the mold made for the H290C, I wanted the extra thickness near the throat for strength, so I chose to omit the inner three mounting holes. The two-hole arrangement works for the B&C, Eminence and TAD drivers, as well as many others. But sadly, that makes the 2426 a little more work.
Re: PI 4 Upgrades [message #93596 is a reply to message #93581] Fri, 23 April 2021 12:36 Go to previous messageGo to next message
docjrev is currently offline  docjrev
Messages: 6
Registered: February 2021
Esquire
Thanks again, Wayne.
Re: PI 4 Upgrades [message #93645 is a reply to message #93581] Sun, 02 May 2021 13:04 Go to previous messageGo to next message
Jetpump is currently offline  Jetpump
Messages: 6
Registered: July 2020
Esquire
Hi there,
Are there other Beryllium compression drivers that work with the horn such as Radian 475BePB?
Thanks
Re: PI 4 Upgrades [message #93647 is a reply to message #93645] Sun, 02 May 2021 14:31 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18155
Registered: January 2001
Illuminati (33rd Degree)

The Radian 475BePB should work, but I haven't tested it. Not sure about the exit angle and whether it matches to entrance of the H290C. Also, you would want to match the sensitivity using R1/R2 values from the chart below:
               dB        R1        R2
               ========================
               6dB     12 ohm    30 ohm
               8dB     12 ohm    20 ohm
               10dB    16 ohm    16 ohm
               12dB    25 ohm    16 ohm
               14dB    30 ohm    14 ohm
               16dB    40 ohm    12 ohm
               18dB    50 ohm    12 ohm
               20dB    75 ohm    12 ohm
               ========================
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