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-   Inspire by Dennis Had (https://www.audioaficionado.org/forumdisplay.php?f=184)
-   -   Dennis Had Inspire Amps (https://www.audioaficionado.org/showthread.php?t=24170)

Rosco65 09-08-2016 09:34 PM

Quote:

Originally Posted by Bombadil (Post 802426)
Oh, I'm just kicking tires. I'm set in my primary system with my Von Schweikert towers. Must admit I've never been a big high efficiency / full-range speaker guy. My VS are 4-way with very complex crossovers, some 4th order, some 2nd order. I love 'em.

My favorite bookshelf speakers that I've heard have been Sonus Faber, Joseph Audio, and Harbeth. My current Focal Aria 906 are pretty good, not overwhelming good, although they were named by The Absolute Sound as one of their top picks for a bookshelf speaker.

I do have a small pair of Fostec speakers, using their FE126Ne full range driver. It's okay but I find it somewhat fatiguing.

I'm entertaining the idea of selling off some of my gear and then looking for a more efficient monitor for my 2nd system, maybe in the $2000-$3000 range and probably used. Definitely not a tower speaker, I'm already set there. Maybe something like this:
REFERENCE 3A - MM de Capo BE

The Super 3's that I own are the original, wide baffle model I prefer with a dampened Fostex FE127e driver. This is a bit smoother than the FE126e, but it is still a bit shrill on top. The newest RS5 (OEM) driver is a drop-in retrofit that takes about 10 minutes to do. The difference between the two even before break in is not subtle. The new driver is noticeably more efficient, smoother yet more extended on top, and goes deeper down low.

For the price, the Super 3 is hard to beat and is a fantastic way to break into high efficiency/low power audio. Once you start going up the Omega line (and "going up" refers only to price) we start trading compromises and beginning to compete with multiway speakers. One aspect of Omega line is that one driver handles most of the musical spectrum with no passive crossover components. This is not unique to single-driver speakers. There have been a number of two way speakers that let the low frequency driver run full range with no crossover and bringing a tweeter in to fill in the top. Examples include:

- Reference 3A MM DeCapo and other iterations,
- Dynaco A25 (one of my favorites. Just a really good sounding speaker)
- Joe Roberts' interpretation of the Altec two-way using 414/802/32a components. He recommends letting the 414 run full range and bringing in the 802 at 6-8khz. The ALtec 414A/B/C has been referred to as the best midrange driver ever made. One that just happens to reproduce bass.

Bombadil 09-08-2016 11:01 PM

I once owned Dynaco A25s for about 5 years. Really smooth sounding speaker. I can understand why people like them.

trackpad 09-09-2016 12:11 AM

Since getting my LP-27a, I have missed my remote. I just installed a remote controlled passive controller.

It works like a charm. I'm currently feeding three inputs (one digital and 2 analog). One line output goes to the LP-27a and the second to my powered subwoofer (Zu Undertone). The fixed output will allow me to add a headphone amp. I'm seriously interested in Dennis' headphone amp.

The mute and volume feature is handy since I stream audio, play ripped files via JRiver and am feeding broadcast TV all through my PC and into my DAC, and can disable the sound from annoying ads, adjust sound leve , etc. I really can not hear any sound degradation.

The only drawback is that I wish it was Gold and Harley Black!

pstrisik 09-09-2016 01:01 AM

Quote:

Originally Posted by trackpad (Post 802511)
Since getting my LP-27a, I have missed my remote. I just installed a remote controlled passive controller.

It works like a charm. I'm currently feeding three inputs (one digital and 2 analog). One line output goes to the LP-27a and the second to my powered subwoofer (Zu Undertone). The fixed output will allow me to add a headphone amp. I'm seriously interested in Dennis' headphone amp.

The mute and volume feature is handy since I stream audio, play ripped files via JRiver and am feeding broadcast TV all through my PC and into my DAC, and can disable the sound from annoying ads, adjust sound leve , etc. I really can not hear any sound degradation.

The only drawback is that I wish it was Gold and Harley Black!

Curious who makes the remote attenuator. I was looking at that possibility at first, but I'm relying on the one built into my streamer/DAC instead.

trackpad 09-09-2016 01:17 AM

Quote:

Originally Posted by pstrisik (Post 802515)
Curious who makes the remote attenuator. I was looking at that possibility at first, but I'm relying on the one built into my streamer/DAC instead.

I have no idea, I guess it is possible to open the case and find out.
It is a motorized volume control.

I like the feature of the volume automatically going to zero and automatically going to the mute (turning off all inputs) when first powering up the unit. No surprises when turning on the LP-27a and Firebottle KT88 SE HO.

Rosco65 09-09-2016 07:24 AM

Quote:

Originally Posted by pstrisik (Post 802515)
Curious who makes the remote attenuator. I was looking at that possibility at first, but I'm relying on the one built into my streamer/DAC instead.

I you want a high end remote control (either as TVC or using a stepped attentuator) Bent Audio is a good source. BentAudio.com :: TAP

Rosco65 09-09-2016 08:37 AM

Quote:

Originally Posted by pstrisik (Post 802416)
:thumbsup: I've got a couple of the fat bottle U52's. I assume that's the one you have. I just checked ebay and they have already jumped in price from when I obtained mine a year+ ago. I would hate to sell off some of the best in the collection though, even if the upgrade made the choice of rectifier less critical. Maybe we could get $1000 for one in a few more years!

Dennis informed me that he has made some changes to the Hot Rod power supply that allow for the use of both directly and indirectly heated rectifier tubes. I am still unclear how critical those tubes will be in this application, but he said that with a simple balancing circuit any ripple is eliminated.

Analog Addict 09-09-2016 10:14 AM

Here are the notes Dennis took on the Hot Rod amp. Columns are Bias Voltage, Bias current calculated using Ohm's law and a bias resistor of 360 ohms, and maximum output wattage...

http://i443.photobucket.com/albums/q...psskdsf34n.jpg

He also told me about the change to use directly heated rectifiers, but I don't know any more at this point....

Bombadil 09-09-2016 11:07 AM

So that is for the amp which he sold as the ET88 Hot Rod 12 wpc.

I have the 17 wpc version of this amp, using 5AR4/GZ34 with Genalex KT88. So I'm guessing all or most of the above output values would be higher on my amp.

Also note that the Tung-sol KT66 is really more like a 6L6GC, with a 0.9a draw. The Genalex KT66 draws the full 1.3a and likely makes more power.

pstrisik 09-09-2016 11:26 AM

Quote:

Originally Posted by trackpad (Post 802518)
I have no idea, I guess it is possible to open the case and find out.
It is a motorized volume control.

I like the feature of the volume automatically going to zero and automatically going to the mute (turning off all inputs) when first powering up the unit. No surprises when turning on the LP-27a and Firebottle KT88 SE HO.

No need on my account. I assumed it was a branded product. But it does sound like a complete solution that goes in line from the source to preamp (or preamp to amp I guess). Maybe it was built from the Bent parts! continued below........

Quote:

Originally Posted by Rosco65 (Post 802538)
I you want a high end remote control (either as TVC or using a stepped attentuator) Bent Audio is a good source. BentAudio.com :: TAP

I wouldn't want to take on a project from parts at this point. However, it looks like some of what Bent offers would be compatible with existing Inspire preamps to make them remote controlled, ie, not an external box. I have the DACT attenuator and they make a motorized control for it. Only problem would likely be fitting the motor unit and the PCB both inside the chassis. Already pretty tight in there. Could be something Dennis incorporated if the layout was designed for it, but he hasn't seemed particularly interested in remote control.

At this point, I'm glad I have a DAC that I really like that has a remote volume attenuator. My LP-2 is set on full volume with the DAC dialed back.


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