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Inspire by Dennis Had Enjoying Vacuum Tube Audio

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Old 12-09-2019, 05:35 PM
Analog Addict Analog Addict is offline
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Originally Posted by oldominion View Post
GPA hasn't responded to two emails I've sent. I've heard that customer service isn't a strong suit...

And yes, I've been recommended a subwoofer by many 604 users. I've never been a fan of subs, have never really heard a system with a sub that sounded that good to me. You are correct, however, that that should be a move to consider...but I'd probably just sell the 604's before going down that road. I have limited room and the 604's already take up enough space!

Back when I bought the amps I had a back and forth with Dennis. He's not a huge fan of the 604's, even though he once designed a xover for them, nor subs.
As an Altec collector, I've had multiple interactions with GPA. You're wasting your time with e-mail. The only way to really get in touch with them is to call them. If you're lucky, Bill H himself will answer

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Originally Posted by straitwire View Post
I imagine Dennis is chuckling right now.
Dennis has designed and manufactured tens of thousands of amplifiers with voltages ranging from 2000 to 7000 volts and producing 500 watts to 8000 watts of output power. 900 volts is child's play. What a hoot...
As backstory, don't forget that Dennis is an old HAM and founded the HAM radio companies Dentron and Ameritron. He still builds and tinkers with an old friend and as Straitwire mentioned, kilovoltages are old hat for him. But, I asked him the 845/811 question quite awhile ago and at least at that time, he did not have output transformers available that met his standard for the power handling requirements created by those tubes
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  #5462  
Old 12-10-2019, 01:16 AM
Bombadil Bombadil is offline
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Originally Posted by oldominion View Post
And yes, I've been recommended a subwoofer by many 604 users. I've never been a fan of subs, have never really heard a system with a sub that sounded that good to me.
No experience with 604s, but I have obtained acceptable subwoofer integration using a little trick. Using test tones, I dial in my subwoofer at -1 dB below the output from my monitors at 120Hz. Or even -2 dB. Then set the sub crossover to 60Hz.

I'm not looking for a really strong bass presence, rather I try to just add some lower bass presence / fullness. Some music has some very important content down in the lower registers and it isn't the same without it.

I've found that by running my sub at a bit lower volume level that it musically integrates better with my primary speakers while still having a presence on the lowest registers.

One of the combinations I use this for is using a sub with my Focal 906 monitors when driven by my low-power Inspire EL84 amp. But in this config I also filter off the low frequencies to the amp or else it clips very easily trying to hit the lower notes.
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  #5463  
Old 12-10-2019, 10:58 PM
bwilson51 bwilson51 is offline
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Default Inspire LP-3.1a early or early Christmas present

I have a Inspire LP-3.1 preamp that I sent to Dennis to checkout,the preamp checked out fine .I have decided to have it updated to the current model LP-3.1a,I hope he finishes it in time for me to pick up next week while I am in NC for Christmas.If not I will pick it up after Christmas,I am in no hurry and then I can’t wait to hear it in my system.Takling to Dennis today was a real treat.
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