Banana plugs w/ RM30s

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KJ

Banana plugs w/ RM30s
« on: 10 Dec 2004, 12:19 am »
Has anyone had any issues using banana plugs with the binding posts on the RM30s?  I know Zybar had some issues a year ago with the binding posts on his RM40s and resolved it with extension collars.  I was curious if the same applies to the RM30s or if this is a thing of the past.

Thanks.

-KJ

John Casler

Re: Banana plugs w/ RM30s
« Reply #1 on: 10 Dec 2004, 01:04 am »
Quote from: KJ
Has anyone had any issues using banana plugs with the binding posts on the RM30s?  I know Zybar had some issues a year ago with the binding posts on his RM40s and resolved it with extension collars.  I was curious if the same applies to the RM30s or if this is a thing of the past.

Thanks.

-KJ


Hi KJ,

The binding posts on VMPS are some of the best you will find.

They have a weighty solid nut that can tighten quite well on a "solid" metal post.

These are expensive solid metal posts and nuts with no plastic.

The prefered method of binding for VMPS is Spades and this post works the best with spades.

As far as bananas, you will find that the new generation of bananas are spring loaded sawtoothed barrels that are the same circumference from front to back.  This type of barrel provides maximum contact, and compresion pressure for this connection.

Since the post itself is solid (not hollow to accept thinner bananas), it has a shorter depth than those with hollow posts, and is limited to the length of the nut minus how far it is "screwed" to the shaft.

This can be lengthened by adding a "spacer" in front of the nut, which extends the internal shaft.

I would avoid older style bananas that have "tapered" front portions, that then blossom or bulge out about half shaft.  These will have the least contact area and not feel as snug or secure.

So in short:

1) Opt for spades for the best connection
2) If you use bananas get the best and add a spacer
3) I also suggest treating the shaft and the inside of the nut barrel with SilClear for maximum result.

PS - While it will work, they do not easily accept bare wire, since there is no "hole" in the post itself.

John Casler

Banana plugs w/ RM30s
« Reply #2 on: 10 Dec 2004, 01:12 am »
Flared barrel type = not that good



Saw toothed barrel bananas = the best connection


KJ

Banana plugs w/ RM30s
« Reply #3 on: 10 Dec 2004, 02:45 am »
John,

Will the flared barrel type banana connectors not work unless you have the spacers?

-Kevin

jgubman

Banana plugs w/ RM30s
« Reply #4 on: 10 Dec 2004, 03:45 am »
I have the old style bananas on a pair of speaker cables and they work fine. This isn't a very detailed picture of my speaker cables, but FWIW:



The banana plug slips into the nut that screws onto the binding post. You can unscrew the nut long enough to accomodate whatever sized banana you need. If you unscrew the nut far enough, the connection will be a little loose, and you could use a collar to help tighten that.

Either way, the top binding posts on my rm-40s have been connected w/ sil-clear'd banana plugs for well over a year now and they've worked just fine. I think it'd only be an issue if the speaker cable gets handled or moved a lot.

But, John's right, you'd probably want to think about re-terminating your cables to either spades or o-rings.

Geo

  • Jr. Member
  • Posts: 6
Banana plugs w/ RM30s
« Reply #5 on: 10 Dec 2004, 06:19 am »
John, Where do you find the good banana connectors?

Wayne1

Banana plugs w/ RM30s
« Reply #6 on: 10 Dec 2004, 02:06 pm »
WBT Angled bananas are among the best. The have a knurled knob on the back that allows you to adjust the tension on the inside of the post. This is better in that it does not rely on the metal to maintain spring tension.



You can also have Brian modify the binding posts to work with bananas a bit better.

With all that said,  the 1/4" spade is still the best connector to use. You can fit a 1/2" nutdriver over the binding post and apply lots of torque to make the best mechanical connection.

KJ

Banana plugs w/ RM30s
« Reply #7 on: 10 Dec 2004, 07:39 pm »
Quote
You can also have Brian modify the binding posts to work with bananas a bit better.

Can you or Brian clarify what is involved with that?  I'd like to consider all options before making a decision.

Thanks.

-KJ

KJ

Banana plugs w/ RM30s
« Reply #8 on: 10 Dec 2004, 07:40 pm »
How does one connect the cable to the saw-toothed bananas?

Questions, questions...

-KJ

Wayne1

Banana plugs w/ RM30s
« Reply #9 on: 10 Dec 2004, 08:36 pm »
Brian will have to answer that one. I had a customer ask about using bananas.  Brian said it would not be a big problem for him to modify the binding posts while the speakers were in the plant.

The bananas John showed are by AudioQuest. Those in the picture are crimped onto the cable. AudioQuest shows another set that fasten with set screws.

In theory, the Eichmann Bayonet connectors may be even better sounding, but they do not work very well with the short binding posts on VMPS speakers

http://eichmanncables.com/bayonet_plug/

John Casler

Banana plugs w/ RM30s
« Reply #10 on: 10 Dec 2004, 11:39 pm »
Quote from: KJ
John,

Will the flared barrel type banana connectors not work unless you have the spacers?

-Kevin


Hi Kevin,

Sorry for the late response, but my DSL "just" started up again.

The flared type will work, but may seem slightly loose.  Brian supplies a "spacer" that causes the "binding nut" to stay further out on the post and causes a larger (as in longer) barrel for the banana to plug into.

If you have the nut dialed all the way tight on the post, that makes it shorter.

As Wayne has shown the WBT are great as are the AudioQuest.

John Casler

Banana plugs w/ RM30s
« Reply #11 on: 10 Dec 2004, 11:49 pm »
Quote from: Geo
John, Where do you find the good banana connectors?


Hi Geo,

Well As Wayne said the ones I posted are Audio Quest.

Here are some from Apature that I use to "convert" spades to bananas when needed.


Geo

  • Jr. Member
  • Posts: 6
Banana plugs w/ RM30s
« Reply #12 on: 12 Dec 2004, 05:06 pm »
Thanks John those look nice.
I agree that spades are the way to go, with the VMPS binding posts.

geo