JBL L-380 sub
- Thread starter jgarcia
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gonzomeep
Super Member
The JBL BX63(a) is the matching crossover for this sub. You can use just about any HQ crossover though. I think that there is some EQ built into the BX63 unit that optimizes the signal for either the B460 or B380.
I use Sumo Samson subs. They are clones of the B380 and use the same JBL 2235h woofer. The Sumo Delilah crossover is a very solid performer. I've switched to using an Energy brand, EAC electronic. I actually like the Energy EAC better. It provides for adjustable EQ @ 45hz. I would recommend a YAMAHA M80/85 or MX1000 or 1000u for power. Superb combination-JBL/Yamaha. One cool feature of the JBL BX63, Sumo Delilah and Energy EAC is the addition of a inverted pair of line level outputs that allow you to bridge an otherwise unbridgeable amplifier(s) like the M series Yammies.
I use Sumo Samson subs. They are clones of the B380 and use the same JBL 2235h woofer. The Sumo Delilah crossover is a very solid performer. I've switched to using an Energy brand, EAC electronic. I actually like the Energy EAC better. It provides for adjustable EQ @ 45hz. I would recommend a YAMAHA M80/85 or MX1000 or 1000u for power. Superb combination-JBL/Yamaha. One cool feature of the JBL BX63, Sumo Delilah and Energy EAC is the addition of a inverted pair of line level outputs that allow you to bridge an otherwise unbridgeable amplifier(s) like the M series Yammies.
gonzomeep
Super Member
Using the BX63's normal and inverted outputs to bridge an MX800, you would use both channels of the MX800. You take the summed normal and inverted RCA outputs of the BX63 and run them into the L & R MX800's inputs, then use the MX800's Positive speaker output of the Right channel for the Positive B380 speaker input, and the Left channel Positive of the MX800 for the Negative terminal of the B380.
gonzomeep
Super Member
I own L250's. I ran them with the twin Sumo subs for a while. L250's do not lack LF output at all. The main benefit of using the B380 with the L250's, or any other speaker for that matter, is the ability to dial in LF punch for low-level listening. Since you have complete control via the crossover gain and MX800 gains, you can ramp up the B380's output while your L250's are barely idling along. It is a real leap in system ability. Very easy to match the levels with the twist of the gain knob(s). You are in for a real treat.
I had forgot to mention that the MX800 is a good choice. Rare amp. I am still amazed that the big M series amps can still be had for less than $1k. I'd put any of my big M's up against the current high dollar offerings. HQ-SQ.
I want to clarify the connection of the crossover/MX800. The normal (non-inverted) RCA's path dictates the POSITIVE speaker/Sub connection. That means that if you connect the normal (non-inverted signal) crossover output to the the Right MX800 input, then MX800's Right Channel Speaker output POSITIVE is then connected to the B380's POSITIVE input terminal. You must keep the polarity correct wrt to the L250's because if you get it backwards, you will have cancellation, and no bass at all.
So..., if you hook it all up and the bass is almost non-existant, swap the polarity of the B380, it might be out of phase with the L250's.
I had forgot to mention that the MX800 is a good choice. Rare amp. I am still amazed that the big M series amps can still be had for less than $1k. I'd put any of my big M's up against the current high dollar offerings. HQ-SQ.
I want to clarify the connection of the crossover/MX800. The normal (non-inverted) RCA's path dictates the POSITIVE speaker/Sub connection. That means that if you connect the normal (non-inverted signal) crossover output to the the Right MX800 input, then MX800's Right Channel Speaker output POSITIVE is then connected to the B380's POSITIVE input terminal. You must keep the polarity correct wrt to the L250's because if you get it backwards, you will have cancellation, and no bass at all.
So..., if you hook it all up and the bass is almost non-existant, swap the polarity of the B380, it might be out of phase with the L250's.
gonzomeep
Super Member
You're welcomed Jerry. Sorry if I over-explained the set-up. I don't take anyone's knowledge or abilites as a given, hence I try to be thorough enough. You probably already knew most of what I explained.
I use the L250's LE14H-1's in my heavily modded L220's. KILLER LF drivers right?
I powerd my L250's with a 45wpc VTL/EL34 based amplifier just to hear that combo. I wish the VTL has a bit more OOMPH. I couldn't get quite enough loudness for my taste, but what it produced was very, very nice.
I use the L250's LE14H-1's in my heavily modded L220's. KILLER LF drivers right?
I powerd my L250's with a 45wpc VTL/EL34 based amplifier just to hear that combo. I wish the VTL has a bit more OOMPH. I couldn't get quite enough loudness for my taste, but what it produced was very, very nice.
