JohnA

You have what we have coined a Heresy 1.5, made in 1984. They have Heresy II squawkers and are transition models. About that time, the AlNiCo K-55-Vs became difficult to get, so Klipsch moved to ferrite drivers in all models. "HBO" appears to mean Heresy, Black Oak. The woofer may be a K-22-R. Made by Rola Company.

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Your DCR readings are very, very low. My K-77s measure 7.5 and 6.3 ohms. Perhaps your problem is not the magnets.

I use BassBox as well. Then you know you can't drop in different drivers in to a completed box. If you find another driver that's more efficient, it won't go as deep, if it works in your box. It sounds like you have a calibration error or a lack of power, or both. As to some recordings sounding thin, ..... the artist may have meant it that way. That's why I don't mess with mine and are particular about the recording.

KLF-C7. Great center, if not a good match to La Scalas. 🙂

What part of TN? Nashville is covered up with small speaker, mic and electronics repair shops.

I'll throw in Heresy IVs, too. Sublime.

The KA-8300 is a good 2 channel amp. I had Kenwood integrateds in college, wish I'd kept them. It deserves a nice pair of speakers and its own room. Trying to hook all you have to it is possible, if you keep a gentle hand on the throttle (the combined impedance may be a little low), but the results may not be impressive; all channel stereo. You have the makings of a neat home theater setup. I'd get a theater receiver, use the 2.2 as the center, the KG2s as front L&R and the 2.1s (actually 1.2s?) as rear L&R. My rear speaker stands are shaker style rubber tree wood I finished. You ought to have an outboard power amp for the passive subwoofer and let the theater receiver handle the crossover. For instance: https://www.parts-express.com/Dayton-Audio-APA150-150W-Power-Amplifier-300-812?quantity=1

There is little to be gained by biamping Heresies. Modifying the cabinets and crossovers to separate the the woofer from the HF would stop me. However, if bridged for mono, their approximately 100 watts each will be a perfect match for your vintage Heresies. Heresies protect their tweeters very well. Dinna fash a whit about your tweeters. I'll recommend placing the speakers in or near a corner to boost the bass output so you're not tempted to turn up the bass knob and put your woofers at some risk.

https://www.klipsch.com/products/ksm-8 Looks like a Reference series horn. Try 1-800-KLIPSCH and see if you can get a replacement diaphragm, driver or complete horn.

The softness (stiffness?) of the cone has no bearing on the resonance or LF capability of a woofer.

I have 4 VMPS Larger Subs (92 dB/w/m) driven by 2 Acurus A-250 amps (300 to 350 wpc) in the corners. That keeps up with my La Scalas and Heresies nicely, without noticable distortion. The drivers must be mated to the cabinet volume and tuning. Don't substitute other drivers in a completed cabinet. K-33s and K-34s are not great sub drivers. Choose others that are better at it. Certainly add power. Get an SPL meter with a known calibration or software (REW?) to set your sub levels and leave them alone. Different recording have different bass levels and that is part of making great music.

The most practical method of getting La Scala to go deeper is to stack 4 in a cube and put the HF cabs on top. That is similar in effect to putting them in a corner. Low bass with long wavelengths need long horns. Your K-43s can tolerate some eq, too.

Mine were filled with wood filler in some gouges, treated with a conditioner, stained with MinWax red mahogany and sprayed with water-based satin polyurethane. The front edge plies were covered with a 3/4 x 3/4 cherry strip. Grille's are Klipsch.

You'll spend less buying complete speakers, but it can be done.

In a La Scala, the K-43 is an excellent choice and WILL NOT produce less bass. Actually, it is a dB or 2 louder. Since the La Scala bass horn is short, the K-43 goes as deep as a K-33. In the longer Klipschorn bass horn, a K-43 gives up a little low bass, but not enough for me to pay to change them were my Khorns equipped with K-43s.

The tweeter, squawker and crossover look correct. Their is no Subwoofer/sub. The WOOFER is not correct, but a K-22-? of any variation will work properly.

I have had a new pair of speakers that needed 40 to 50 hours for the woofer to loosen up and make enough bass. I have never noticed any SS electronics change sound over any amount of time.

I replaced the terminals in some of my Heresies with terminal cups. Round are trivial to cut, install and seal. https://www.parts-express.com/Gold-Banana-5-Way-Recessed-Speaker-Terminal-Round-260-311?quantity=1

Can you get the electronic crossovers and power amps? I'd offer them with those and give the option of the buyer installing his own passive crossovers. The original crossovers aren't in an old box are they?

X is 1982. If the squawker (midrange) driver has soldered terminals (likely it does), you have one of the best sounding Heresy Is. Since they are Birch, Raw, expect $300 to $600 depending on actual condition and where you live.

We forum nerds have informally called '84 and '85 models Heresy 1.5s. They were transition years between Heresy and Heresy II. They have HII squawkers and HI woofer/tweeters and a matching crossover.

More than that, even. I would start it on the 4 ohm taps, but also try the 8s.

A passive radiator is a substitute for a resonant port. It has the advantage of also limiting the woofer's travel below resonance (protecting the woofer from very low bass notes). Do not change or modify it. Do not remove it, the cabinet volume is sized to use a passive radiator and will probably be too big for the woofer if you remove it. Adding a second active woofer will require a cabinet with double the volume of one with a single woofer. If you want deeper bass, add a good subwoofer (sound lower/under a woofer). If you want louder bass, move them closer to a corner or add EQ.

Very much untrue. "Phono" has much more gain and a built-in eq for the records. It boosts bass and cuts treble to compensate for the eq cut into the record (so the stylus can stay in the grooves). The OP's post sounds like he already has it plugged into "Line".