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Goodbye Type 45 ....... hello JJ 2A3-40

71.50.21.8

Posted on October 10, 2016 at 11:34:51
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Hello,

After a YEAR of building and listening to two superb Type 45 DC two stage amps, I have GIVEN UP on Type 45s, ... STs or Globes !! No more !!

Yes, friends, I hear ALL the "nice" things a Type 45 does, in the ranges where it plays well. Its fine for a radio.

But what I can't stand is ...... and CERTAINLY what NO ONE EVER talks about, ...where the tube does NOT play well.

******* There is a HUGE mid range SUCK OUT, a BROAD non-linear power-delivery-deficiency in the mid range, ( as I say, NEVER discussed ) that has been driving me NUTS the last year on my well set up ALTEC A7-800s. ******

As soon as I put in a pair of JJ 2A3-40s, a few days before RMAF, biased as a Type 45, only 27 mA.!!!, ******* the suck out was GONE, and the amp and SPEAKER played with power, authority, and LINEARITY into my listening room.********

My 515Bs and 802Ds came to life - scared me.

Raised the JJ's bias up to 44 mA. where I want to run the tube, and it all came into better focus.

I WASTED a full year of my life, since these 45s were the ONLY amp I used - and had on-hand in my home.

Now that the RMAF show is over , I will re-do my SET DC amp into a "proper" JJ 2A3-40 amplifier, likely use a conservative op point ....44 mA. and 250 VDC P-K.

The JJ 2A3-40 tube, when well implemented ( as I JUST heard it for 3 days at RMAF ), can ROCK. Heard it versus an EML mesh 2A3 this past weekend. I'll take the dem JJ's for MY listening tastes, in my amp, thank you !!

Jeff Medwin

NOTE, I have NOT heard an EML Type 45 tube, which MAY easily out perform a standard Type 45, due to the EML's large LINEARLY SPACED filament structure.

The JJ 2A3-40 HAS the EML's similar shaped and superior type of filament structure to begin with.

NOT a tiny radiating " V " or a " W " - shaped ( NON-LINEAR-spaced ) filament structure, as do ALL old-stock 45 tubes !!

 

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RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 12:30:54
used-hifi
Audiophile

Posts: 454
Location: portage IN
Joined: March 18, 2003
I would have to agree these old type 45 finals have a "U" shape response when driving a speaker ....heard it myself years ago :) and I was much younger then too! I'm 45 now I still have great hearing today

Now Jeff your going to get all kinds of flack for these statements because it will measure on the bench good and flat in that range!!! I say remeasure while your speaker is connected your amplifier


Obviously if your speakers are fat there in them ranges then your all good!!!

But to be honest the 2a3 tubes are better imo still not good enough in the amps I heard them in my pset 1626 killed them

Anyways let the flaming begin!!

Lawrence

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 12:36:11
Cut-Throat
Audiophile

Posts: 11234
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
I have 3 pairs of Monoblocks..... All Welborne Labs 300B, 2a3, and 45s.

My solution was to Bi-amp. Before that the 2a3 amps always had more dynamics. The 45s just did not have enough power. Now that they only have to power 114db Oris Horns the 1.8 watts are plenty.

I rotate all the amps in and out, but I prefer the 45s in this setup.... the 2a3s are nice, but don't have that 'spooky in the room' sound especially with female vocals.

Cut-Throat




 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 12:54:00
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
' Don't doubt you one moment Cut Throat. :-)

Its not clear, does your 2A3 amp use a JJ 2A3-40??

Also, I am talking about a tube comparison in my own DIY amp implementations.

None of the commercial amps you've mentioned could I use and be happy with in my system.

Jeff

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 12:59:07
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
In my post, when I say, 2A3, I am NOT talking about any biplate 2A3, but specifically, the latest JJ 2A3-40s, which I suspect you have never heard, and especially - well implemented.

I just heard that tube, optimized in a amp, for three days in a row, at RMAF this weekend.

Jeff

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 13:03:40
Cut-Throat
Audiophile

Posts: 11234
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
"None of the commercial amps you've mentioned could I use and be happy with in my system."

I wouldn't either!

Cut-Throat




 

RE: Altec A-7s are like Convertibles, posted on October 10, 2016 at 16:15:37
kitch29
Audiophile

Posts: 528
Joined: May 1, 2015
You have to own one at some point, than finally can't wait to get rid of it.

 

RE: Altec A-7s are like Convertibles, posted on October 10, 2016 at 20:36:51
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005






Cute saying, LIKED it a LOT.

But NO ONE, except me, has yet to hear an A7-800 with "MY" implementation,

MY amps, my through-the-system-wiring, MY custom crossover, a different HF horn, and over 280 pounds of mass loading on each enclosure.

Jeff

 

The latest JJ 2a3-40 that's been out of production for quite some time, or..., posted on October 10, 2016 at 20:50:31
DeKay
Audiophile

Posts: 3864
Location: So. CA
Joined: November 22, 2002
is there a new current production version?

 

RE: The latest JJ 2a3-40 that's been out of production for quite some time, or..., posted on October 10, 2016 at 21:02:56
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Hello,

That was a mistake on my part. I do NOT keep up on tube production.

I just assumed since people were selling them retail, that they were still being made. Mine are about 8 years old, and I JUST this month plugged them in !!

Can you "update me" on two questions, that come to mind ??

Q1) When did they stop producing the tube?

Q2) ANY IDEA, is there plenty of existing stock from the various tube-selling dealers?

Thanks in advance. Appreciated.

Jeff Medwin

 

Jeff: Don't know when they stopped production (not good with time), but..., posted on October 10, 2016 at 21:27:49
DeKay
Audiophile

Posts: 3864
Location: So. CA
Joined: November 22, 2002
for the past 9-18 months (again not good with time) they have been slim pickens on the Internet.

I didn't buy them early on because I did not have enough clearance (they are taller than average) in my audio rack.

Dumb on my part (though I've yet to do so) as my long term plan was to place my Bottlehead tube amps on a separate shelf above the rack, as it's stupid to have tube amps "under" a CD deck and turntable with the heat generating upward.

Thought, perhaps, there was a new version, but guess not.



 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 10, 2016 at 23:18:16
RGA
Reviewer

Posts: 10052
Joined: August 8, 2001
Experience isn't a waste though. Sometimes you have to live with something lesser to appreciate more something that is better.

The 2a3 is so far my favorite output tube that is affordable. My next amp is likely going to be the Audio Note Empress monoblock 2a3s. They seem to punch well above their price range and they seem to have far more power especially in the bass than I would expect for 7 watt amps - and certainly more ballsy than any 300B I've heard. And yet they remain delicate enough not to be overbearing or too midrange bloomy.

 

RE: Hey, I've got bricks, too!, posted on October 11, 2016 at 04:24:41
kitch29
Audiophile

Posts: 528
Joined: May 1, 2015
Does underneath count?


 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 11, 2016 at 06:50:01
deathtube 667
Audiophile

Posts: 1270
Joined: November 25, 2010
SE 45's worked OK for me in an active bi-amp system.

Trying to go full range with one low power SE amp has to be one of the more difficult things in our hobby.

Only a few builders like your friend DF of SS have the knowledge to do it and he uses a modern 2A3 final.

 

All systems have their weaknesses, posted on October 11, 2016 at 09:31:49
Frihed89
Audiophile

Posts: 15082
Location: Copenhagen
Joined: March 21, 2005
For some people, the more music one gets (that one likes), the more one nitpicks about what one doesn't get.

 

In my case, goodbye 2a3, hello 2x4P1L, posted on October 11, 2016 at 12:17:25
andy evans
Audiophile

Posts: 2925
Joined: October 20, 2000
I used 2a3s until I discovered 2x4P1L outputs a few years ago. They sounded better in my system because I could use them in filament bias so no cathode bypass cap. And also being mu=11 I could drive them with another DHT, presently 01A with a gyrator, and just have a total 2 stages of amplification after my DAC.

Very similar to a 2a3 - 250v p-k and 18W dissipation maximum per pair. You can run them up to about 35mA each or 70mA as a pair.

Needless to say, they obliterate all the other output tubes in terms of economy of use. I bought 150 at $4 each back in the day. Never used another type of output tube since. I'm happy!

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 11, 2016 at 22:42:37
horny
Audiophile

Posts: 721
Location: holland
Joined: October 17, 2003
In a good amp the 45 sounds wonderful
much ,MUCH better than a JJ2a3 and i have also the 2a3 and 45 from EML solid and mesh
the JJ 2a3 is not the best sounding tube.
But you can only hear that is a well build amplifier
no paralel capacitors you waist your time with that believe me.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 12, 2016 at 03:27:58
horny
Audiophile

Posts: 721
Location: holland
Joined: October 17, 2003
The JJ 2a3 is in fact the 300b tube but with 2,5 volt hrster
It has notting to fo with a 2a3
If you like that tube you also like a 300b
They have Exactly the same sound.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 12, 2016 at 06:02:53
First post here :)

Don't blame the tube , it could easily be implementation related , assuming this is a DIY rather than commercial amplifier

Sounds like you have a power supply related issue . Swapping a type 45 to a 300B (or rather a 2.5V filament 300B in the case of the 2A3-40) , you were obviously using a suboptimal supply configuration for the type 45 , which IMO is one of the more perfect tubes out there . I suspect if you measure the output impedence with the 45 in place you will see anomalies which can be isolated to the power supply configuration . Inadequate reservoir capacitance is probably the culprit

John Rush

 

RE: In my case, goodbye 2a3, hello 2x4P1L, posted on October 12, 2016 at 09:34:12
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Don't doubt you one iota Andy !! Q. : But....were you using a JJ 2A3-40 in your system ???

Jeff

 

LOL, posted on October 12, 2016 at 09:43:10
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Yes, it was a DIY amp, and ( IMHO ) I likely build one of the best designed ( and executed ) supplies ever done in the entire history of SET audio !!

It IS the ST or Globe 45 tube, a broad midrange suck out !!

But, if you are happy with it, and it works in your high uF circuit, that is great !! Use it. enjoy it.

Jeff Medwin.

 

err, there can be nothing pertaining to humble in that statement, Jeff~nT, posted on October 12, 2016 at 11:29:56
Cleantimestream
Audiophile

Posts: 6571
Location: Kentucky
Joined: June 30, 2005
~!
The Mind has No Firewall~ U.S. Army War College.

 

:-) /nt, posted on October 12, 2016 at 12:26:01
Ivan303
Audiophile

Posts: 34799
Location: Cadiere d'azur FRANCE - San Francisco
Joined: February 26, 2001
n



 

I like the solid plate EML 45, posted on October 13, 2016 at 00:17:57
Frihed89
Audiophile

Posts: 15082
Location: Copenhagen
Joined: March 21, 2005
Better mids and highs.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 13, 2016 at 04:18:33
lokie
Audiophile

Posts: 1196
Location: Georgia, USA
Joined: January 28, 2003
it's the speaker.

45's are not going to handle a 15" woofer properly.

They need 105 db and up efficiency.

 

RE: Just a minute while I set fire to my 2226s (nt), posted on October 13, 2016 at 05:04:39
kitch29
Audiophile

Posts: 528
Joined: May 1, 2015

 

designing with that attitude leads to confirmation bias , posted on October 13, 2016 at 06:02:02
A designer should always ? there work doubt there design make it prove that its right. If a designer feels they are the worlds best they most certainly are not.

 

RE: LOL, posted on October 13, 2016 at 06:11:37
See link . Hope this helps . I think I'll be avoiding this place in future

Hopefully will see some of you at RMAF or at the London Novotel show in 2017 :)

John Rush

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 13, 2016 at 07:03:24
Frihed89
Audiophile

Posts: 15082
Location: Copenhagen
Joined: March 21, 2005
I agree. It's real close. If you don't have a WE 300B, then the ELROG 300B is the next best tube to my ears. Of course, the amp's circuit and in some cases (depending on the circuit) the driver and rectifier can also influence the sound, if you hold everything else constant.

 

Yes !!, posted on October 13, 2016 at 07:44:02
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Note, I was ONLY discussing ST and Globe 45s. These have a " V " or " W " shaped filaments.

All the EML DHTs have LINERLY spaced ( to the plate - and large ) filament structures, as does the JJ 2A3-40.

I have never done much with EML 45s, but I could " imagine " them, from their filament-plate design, to be superior sounding to the V and W older 45s.

I struggled in my living room with ST and Globe 45 amps for a year, NO MORE !!! As soon as I inserted a JJ 2A3-40, operating as a Type 45 ( 5 K output XFR and only 27 mA. Ia ) my VOTTs came to life and sounded linear in the midrange, on piano, etc.

Next, I will convert to a proper 2A3 circuit !! Man, my 515B woofers, in their top range ( crossed over at 800 hZ ) really " rocked" for the FIRST time in a year !! This VOTT system, as I am configuring it, will become a solution I have been looking for in audio, for a long time !!

Cheers,

Jeff

 

Maybe so sir ...., posted on October 13, 2016 at 08:01:34
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Maybe so, maybe not so. Don't know. The JJ 2A3, OPERATING as a Type 45 ( 27 mA. biased ) sure played the system well.

Its a VOTT A7-800 with SUPERB wiring from the AC cord of the amplifier, through custom crossovers, with ( 9 AWG ) wiring to EACH 515B woofer's polarity, soldered to the voice coil's terminals. Probably among the one or two best-wired VOTT systems ever done in audio.

All I know is, an ST and Globe 45 wouldn't power my system properly in the mids on piano, etc. I am guessing my rig is maybe only 102 dB, but VERY effectively wired through out.

Mind you, folks, I hear all the good things a 45 does, that sucks people in, but if its deficient in the mids, I won't use it.

Maybe, ( I could imagine ) an EML 45, with a much larger cathode, and the filaments linear spaced, will be OK. The ST and Globes,..... were not !!

Jeff Medwin

 

John, posted on October 13, 2016 at 08:09:20
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
Hello,

Wanted to write to you to apologize on your first post, and do a further explanation. But there was no way to contact you through the forum. I am sorry about this.

Were you at RMAF last week? I was. By any chance did you hear the ALTEC 604 MLTL and 2A3 system there?

Is there any way we can correspond? I have some material for you to see.

Jeff Medwin

 

RE: Goodbye Type 45 ....... midsuckout?, posted on October 13, 2016 at 08:47:03
Iain42
Audiophile

Posts: 776
Location: Arcansaw
Joined: February 10, 2004
I'm running a 45/2a3 interstage stereo amplifier on 107db1w1m two way fully horn loaded speakers and there is no mid level suck out on 245 globes, 45 st, 45 mesh EML, sovtek 2a3, and rca 2a3. If there was mid suckout the 45 would totally suck. Would it have such widespread use?






High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

Narcissistic Personality Disorder, posted on October 13, 2016 at 10:18:27
Triode_Kingdom
Audiophile

Posts: 5770
Location: Texas
Joined: September 24, 2006
It's too bad you were subjected to this abuse so soon after posting. The great majority of us here do understand your technical points. Can I request a favor and ask that you just send a quick note to the mods? This behavior has been problematic here for some time, and it now seems virtually impossible to attract any new talent to the forums as a result.





--------------------------
Buy Chinese. Bury freedom.

 

RE: Goodbye Type 45 ....... midsuckout?, posted on October 13, 2016 at 11:41:20
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
I am, at best 102 dB, and it was there !!

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 14, 2016 at 03:09:42
horny
Audiophile

Posts: 721
Location: holland
Joined: October 17, 2003
The JJ 2a3 is in fact the 300b tube but with 2,5 volt hrster
It has notting to fo with a 2a3
If you like that tube you also like a 300b
They have Exactly the same sound.

 

Exactly why more people don't do this, posted on October 14, 2016 at 06:13:12
Triode_Kingdom
Audiophile

Posts: 5770
Location: Texas
Joined: September 24, 2006
People who talk about high efficiency don't have full range systems. There may be a few out there with full-length bass horns stuffed into the basement or attic, but otherwise, they're deficient. People try to overcome this by adding non-efficient woofer and sub-woofer systems, but it's not the same. In fact, I'm always astounded to hear someone rant about the tiniest nuance of equipment design, then throw it all away with a split speaker system. Headphones are another matter, one of the few ways to enjoy the goodness of tubes like the 45 without moving into a 30,000 sq ft house. :)






--------------------------
Buy Chinese. Bury freedom.

 

RE: Why are some still here?, posted on October 14, 2016 at 07:18:48
deafbykhorns
Audiophile

Posts: 648
Location: Florida
Joined: October 17, 2003
I don't understand why some have not been banned by now. I lay low and tend not to respond when certain people are active here and usually end up posting on another forum.

 

Yep..., posted on October 14, 2016 at 08:26:04
Ivan303
Audiophile

Posts: 34799
Location: Cadiere d'azur FRANCE - San Francisco
Joined: February 26, 2001
There's fixed bias, cathode self bias, grid leak bias and confirmation bias.

Jeff's amps mostly use the latter.





 

RE: LOL, posted on October 14, 2016 at 09:23:56
cpotl
Audiophile

Posts: 686
Location: Texas
Joined: December 6, 2009
John, I was struck by this line in the Wikipedia page you linked to:

"People with NPD tend to exaggerate their skills and accomplishments as well as their level of intimacy with people they consider to be high-status."

Cheers,
Chris

 

RE: "well as their level of intimacy with people they consider to be high-status"...., posted on October 14, 2016 at 09:54:58
Ivan303
Audiophile

Posts: 34799
Location: Cadiere d'azur FRANCE - San Francisco
Joined: February 26, 2001
Would that be Dennis?





 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 15, 2016 at 02:11:19
91derlust
Audiophile

Posts: 441
Joined: December 25, 2014
Two different things. Efficiency is largely about volume. Other factors relate to control.


Cheers,
91.

"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein

 

RE: In my case, goodbye 2a3, hello 2x4P1L, posted on October 15, 2016 at 10:01:32
banpuku
Audiophile

Posts: 908
Joined: January 19, 2006
Andy, Any chance you could post the schematic for your 2x4P1L with filament bias? If you don't want to post it, then possibly email it to me.

Thanks,
Pat
banpuku@mac.com

 

For schematics, see Bartola Valves (nt), posted on October 16, 2016 at 01:33:55
andy evans
Audiophile

Posts: 2925
Joined: October 20, 2000
.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on October 18, 2016 at 03:24:33
PakProtector
Audiophile

Posts: 11234
Joined: May 14, 2002
Poor PS implementation is not restricted to DIY-ers by any stretch. Not even close...:)
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: designing with that attitude leads to confirmation bias , posted on October 18, 2016 at 05:41:57
Cpwill
Audiophile

Posts: 385
Location: DC
Joined: December 22, 2003
Contributor
  Since:
October 24, 2008
And a speaker designer should always question there (sic) spelling. However, I agree with you 100%.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on November 18, 2016 at 17:41:34
sony6060
Audiophile

Posts: 677
Location: SE MI
Joined: August 8, 2014
I built two amps, but were PP type. Almost identical builds with same driver/splitter tube, the 45 was smooth sounding with strong bass. But, a triode connected 7C5 sounded more dynamic. The early Sylvania 7C5 oval plate was better than a large lot of various 6V6s I auditioned.

 

RE: Hey, I've got bricks, too!, posted on December 2, 2016 at 07:17:53
drlowmu
Manufacturer

Posts: 9592
Location: East of Kansas City
Joined: January 10, 2005
No, it does not mass load the cabinet, it mass loads the floor.

 

Saying it Out LOUD -:), posted on December 2, 2016 at 18:50:20
megasat16
Audiophile

Posts: 190
Location: SoCal
Joined: April 15, 2015
Diffraction! All that bricks around the speakers only makes the room reflection worse. :)

If a speaker needs help with that much weight for proper focus in the room, may be it's not the right speakers to begin with or rather a lousy room that requires an extensive room treatments.
.
.
.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.

 

RE: Goodbye Type 45 ....... hello JJ 2A3-40 , posted on December 2, 2016 at 18:59:07
megasat16
Audiophile

Posts: 190
Location: SoCal
Joined: April 15, 2015
I only have 6 of the JJ 2A3-40 so I do know what they sounds like. They produce a bit more power at the higher plate voltage and killer heater current requirement most off the shelf 2A3 amps can't supply.

Soundwise, what's so special about them? I have DIY PP 45 / 2A3 / VT-52 amp as well as commercial offering from Raysonic 2A3 amp that uses PP 2A3.

In both amps, I prefer 45 over 2A3 (JJ or RCA or Sylvania). VT-52 comes close to the 45 with a bit fatter mid. Pick your poison based on your speakers but for my OB FR Line Arrays, I don't see how JJ 2A3 kicked any 45 tubes to the curb.

I also have a couple of 45 / 2A3 SET amps and I found the same result as in PP amps.

May be you need to rethink about your speaker choice.
.
.
.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.

 

another take in the same direction...., posted on December 20, 2016 at 03:52:08
PakProtector
Audiophile

Posts: 11234
Joined: May 14, 2002
The folks who claim to have the answers usually have none.

When you see a bunch of pseudo-technical terms applied to justify their results...followed by an attack on those who exercise an Engineering analysis ought to be enough reason to ignore.

That this sort of behavior is well documented, it looks more like some sort of willful ignorance or just outright nastiness to keep pushing it.

I just love laughing at the claims. So utterly ridiculous...like a 2A3 amp with just the right wiring and a driver stage designed to start rolling off in the early 5 digit CPS domain able to deliver power 1-2 orders of magnitude higher than its actual capability. OMG...and the response when asked is to suggest traveling some hundreds of miles to hear one for myself????

Are you out ov yer Vulcan mind, Spock?
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

What is your 45 highpass crossover point?, posted on January 12, 2017 at 09:07:59
tweakydee
Audiophile

Posts: 400
Location: Gainesville Virginia
Joined: February 27, 2004
What is your 45 highpass crossover point if you don't mind? Just wondering how low of a frequency your 45 amp is handling.

 

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