Buy Funktion One Res4E and F121 System Used | musicconcertevent.com

If you are searching for a Funktion One Res4E for sale, looking for a Funktion One F121 price in the used market, or trying to source where to buy Funktion One speakers as a matched system in the USA or Europe, this listing is one of the most complete opportunities you will find right now. At musicconcertevent.com, we supply verified professional audio equipment to sound engineers, rental companies, touring production firms, event organizers, and AV resellers across the USA and Europe.

This listing covers six Funktion One Res4E full-range speakers and six Funktion One F121 subwoofers, both sets in good condition with original fully working components and sequential serial numbers. The Res4E units are sold in pairs at €4,400 per pair. The F121 units are sold in pairs at €4,000 per pair. Three pairs of each are available. Worldwide shipping applies.

Sequential serial numbers are a specific detail that matters to professional buyers and rental companies. It confirms the units came from the same system, were maintained together, and are matched as a set. For a rental company offering a complete Funktion One rig, matched sequential numbers is a selling point that commands better rates and builds client confidence.

---

What Is in This Listing

Two product types are available, sold in pairs independently or as a combined system. Contact musicconcertevent.com for a combined system price across all six Res4E and six F121 units.

• 6 x Funktion One Res4E, good condition, original fully working components, sequential serial numbers, sold in pairs at €4,400 per pair
• 6 x Funktion One F121, good condition, original fully working components, sequential serial numbers, sold in pairs at €4,000 per pair

---

Equipment Manifest

Three pairs of Res4E available at €4,400 each. Three pairs of F121 available at €4,000 each. Total system value if acquiring all twelve units: contact musicconcertevent.com for combined pricing.

---

What Is the Funktion One Res4E

The Funktion One Res4E is a professional full-range speaker from Funktion One’s Resolution series. It is a two-way or three-way loudspeaker system designed for high-output professional PA applications in club, touring, and festival environments. The 4E designation places it within the Resolution 4 family, with the E variant reflecting a specific configuration within that range.

The Resolution series is one of Funktion One’s core professional PA product lines. Speakers from this series are found in professional club installations, festival systems, and touring rigs across the UK, Europe, and the USA. Engineers and rental companies who work with Funktion One equipment are familiar with the Resolution series as a benchmark for clarity and consistency at professional SPL levels.

These units retain their original components, which is consistently the most important detail when buying used Funktion One speakers. Funktion One drivers are specifically matched to the acoustic design of each cabinet. Replacement with non-original components changes the system performance and compromises the acoustic alignment Funktion One engineered into the cabinet. Original components intact means these speakers deliver the performance they were designed for.

If you have searched for Funktion One Res 4 price, Funktion One Res 4E, or how the Res4E compares to Funktion One Res 2, Funktion one res 4s, or Funktion One Res 5, the Res4E sits in the mid-range of the Resolution series in terms of cabinet size and output. The Res 2 is a more compact option for smaller venues and DJ booths. The Funktion One Res 5 is the larger, higher-output option suited for bigger stages.

---

What Is the Funktion One F121

The Funktion One F121 is a professional single 21-inch subwoofer from Funktion One’s F Series bass enclosure range. It is designed for high-output low-frequency reinforcement in professional PA systems, used alongside full-range speakers like the Res4E to provide the bass foundation that a full-range cabinet does not cover on its own.

The 21-inch driver format in the F121 is a large-format subwoofer configuration suited for professional touring and club applications where extended low-frequency output at high SPL levels is required. The F Series from Funktion One covers a range of subwoofer formats including the Funktion One F118 single 18-inch option, the F121 single 21-inch, and larger configurations like the F218 dual 18-inch and the F1201. The F121 sits in the mid-to-upper range of the F Series in terms of output and low-frequency extension.

These F121 units retain their original components, which is as important for a subwoofer as it is for a full-range speaker. Funktion One subwoofer drivers are matched to the cabinet tuning and porting of the specific enclosure. Original drivers ensure the cabinet operates at the frequency extension and efficiency it was designed to deliver.

For buyers comparing Funktion One F121 price options against similar subwoofer formats like the Funktion-One F1201, the F218 Funktion One, or the Funktion One F118, the F121 offers a single large-format driver in a cabinet designed for professional touring and club use. The choice between formats depends on your coverage requirements, available transport capacity, and the specific SPL demands of your target events.

---

Why Sequential Serial Numbers Matter

Sequential serial numbers confirm that these Res4E and F121 units came from the same original system installation. In a professional context, this carries several practical benefits.

First, matched units from the same system have been maintained and operated together under the same conditions. Their components have aged consistently, which means their acoustic output is more closely matched across the set than units sourced from different systems at different times.

Second, for a rental company or production firm offering a Funktion One rig to clients, presenting a system with sequential serial numbers is a professional credential. It tells clients and engineers that the system was properly specified and managed as a complete set rather than assembled from disparate sources.

Third, sequential numbers are a resale advantage. When you eventually upgrade or sell this equipment, a matched set of sequential Funktion One speakers commands stronger buyer interest and better pricing than individual units without matching provenance.

---

What Is a PA Package and How the Res4E and F121 Work Together

The Funktion One Res4E and F121 together form the core of a complete professional PA system. The Res4E covers the mid and high frequency range as a full-range speaker. The F121 provides the low-frequency foundation below the Res4E’s operating range. Together, they constitute a full-bandwidth professional PA system that covers everything from deep bass through to high-frequency detail.

In a practical deployment, three pairs of Res4E and three pairs of F121 give you enough system capacity for a mid-size to large club stage, a festival support stage, or a touring production covering medium-capacity venues. You pair this speaker system with professional amplifiers and a system drive processor to complete the signal chain.

Professional audio companies that build and operate complete Funktion One systems, like those referenced at sasphonik.com and bostonprosounds.com, understand exactly how Res4E and F Series subwoofer combinations are deployed in real touring and club environments.

---

Best Funktion One Speakers to Consider for Professional Event Production

Here is where the Res4E and F121 sit relative to other Funktion One products commonly compared by professional buyers:

• Funktion One Res4E: Mid-range Resolution series full-range speaker, suited for club, festival support stage, and mid-size touring applications
• Funktion One Res 5: Larger output full-range speaker in the Resolution series, suited for larger stages and higher-demand applications
• Funktion one res 4s: Alternative configuration within the Resolution 4 family
• Funktion-One Res 2: Compact full-range option for smaller venues, DJ booths, and fill applications
• Funktion One F121: Single 21-inch subwoofer, mid-to-upper F Series, suited for professional touring and club bass reinforcement
• Funktion One F118: Single 18-inch subwoofer, lower output than the F121, suited for smaller PA systems
• Funktion One F218: Dual 18-inch subwoofer, alternative format to the F121 for high-output bass applications
• Funktion-One F1201: Larger format single subwoofer option in the F Series above the F121
• Funktion One F124: Higher-output single driver subwoofer, different driver size from the F121
• Evo X Funktion-One: Different system format, touring PA using EvoX SH high-frequency elements and compatible bass units
• Funktion-One Res 2 and F218 combination: Alternative smaller full-range and larger subwoofer pairing for different coverage requirements

The Res4E and F121 combination in this listing represents a practical, well-matched professional PA system suitable for a broad range of professional event applications.

---

What to Consider Before Starting a PA Event or Rental Company

If you are building a professional PA inventory and evaluating this purchase, work through these questions first:

• What event sizes and venue formats are you targeting? Three pairs of Res4E with three pairs of F121 is suited for mid-size clubs, festival support stages, and touring productions covering medium venues. It is significantly more than needed for small corporate functions.
• Do you have amplifiers correctly specified for the Res4E and F121 in terms of power handling and impedance? Funktion One speakers require properly matched amplification to deliver their designed performance.
• Do you have a system drive processor that can manage the crossover between the Res4E and F121 and handle system alignment?
• Do you have transport infrastructure for six full-range speakers and six single 21-inch subwoofer cabinets? This is a full touring PA rig and requires appropriate logistics.
• What is your rental rate per system per show and how many shows cover the total purchase cost?

A matched sequential Funktion One system at this price point is a strong foundation for a professional rental inventory. The combined purchase cost of three pairs of each at list prices represents a meaningful but justified investment for operators targeting professional events.

---

Estimated Retail Value and Resale Margin

Used market values are estimates based on general pro audio market activity for Funktion One Resolution series and F Series products. Sequential serial numbers and original components intact place these units in the higher value tier of the used Funktion One market. Actual resale prices depend on timing, region, and buyer demand.

Real profit example: A rental company acquires all three pairs of F121 at €12,000 total and all three pairs of Res4E at €13,200 total, totalling €25,200. The complete system is rented as a package for festival support stage and mid-size touring at €2,500 per show. The full purchase cost is recovered in approximately 11 shows. Every show after that contributes pure margin.

Real profit example: A reseller acquires one pair of Res4E at €4,400 and lists it on GearSource at used market pricing of €6,500. A gross margin of €2,100 on a single pair transaction is achievable for a buyer who understands the market timing and the value of original components and sequential numbers.

---

Where to Buy Funktion One Speakers and Where to Sell Them

For buyers asking where to buy Funktion One speakers used, musicconcertevent.com is a direct source with verified condition, sequential number confirmation, and worldwide shipping. For resale, here are the platforms where Funktion One equipment moves consistently:

• GearSource: The primary industry marketplace for high-value professional PA equipment, strong for Funktion One system listings targeting rental companies and production firms
• Reverb.com: Strong informed buyer base for professional audio, well-suited to Funktion One Resolution and F Series listings
• eBay: Broad reach, effective for Funktion One listings with detailed condition descriptions and sequential number information prominently featured
• Facebook Marketplace: Works for regional buyers, useful for large cabinet systems where local collection reduces freight cost significantly
• LinkedIn: The most effective channel for direct outreach to rental companies, touring production firms, festival organizers, and venue owners who specify Funktion One systems

For a complete matched system with sequential numbers, direct outreach via LinkedIn to touring and festival production companies typically yields the most targeted and highest-value transactions.

---

Why Our Equipment Is Different

At musicconcertevent.com, sequential serial numbers are not mentioned as an afterthought. They are stated upfront because they are a substantive detail that affects the value and appeal of this system to professional buyers. Original fully working components are confirmed because they directly affect the acoustic performance and resale value of Funktion One equipment. Good condition is stated because it is what was verified.

Most used Funktion One listings give you a model name and a price. This listing tells you the serial number matching, the component status, the condition, the pair pricing structure, and the shipping terms before you contact us. That is the standard we hold across every listing on musicconcertevent.com.

---

Why Buy From musicconcertevent.com

We are a professional audio equipment supplier serving buyers in the USA and across Europe. We source from verified professional environments, confirm working condition and component integrity before listing, and handle international shipping on every order. Our catalog is built for sound engineers, rental companies, event organizers, touring production firms, and AV resellers who need professional-grade used equipment with the detail and transparency that professional purchasing decisions require. We are not a general marketplace. Every listing on musicconcertevent.com is focused on professional audio equipment that working operators at a professional level actually use.

---

Shipping Information

Worldwide shipping is available on all units in this listing. For buyers within the USA, estimated delivery is 7 to 14 business days depending on destination and freight carrier. For European buyers, estimated delivery is 3 to 7 business days for most EU destinations. Full-range PA cabinets and single 21-inch subwoofer enclosures require freight-level packaging and carrier handling. Exact shipping costs and timelines are confirmed at time of purchase based on your location, the number of pairs ordered, and the carrier used.

We do not offer local pickup for individual or paired unit sales. Local pickup is available only for truckload purchases, by arrangement. If you are purchasing the full system of six Res4E and six F121 units, contact us before completing your purchase to discuss truckload logistics and combined pricing.

---

musicconcertevent.com vs Competitors

---

Frequently Asked Questions

What is the Funktion One Res4E price?

This listing offers Funktion One Res4E speakers at €4,400 per pair at musicconcertevent.com. Three pairs are available, all with sequential serial numbers and original fully working components.

Where can I find a Funktion One Res4E for sale?

musicconcertevent.com currently lists six Funktion One Res4E units in pairs with sequential serial numbers and worldwide shipping. You can also check GearSource and Reverb for additional used listings, though availability of matched sequential sets varies significantly.

What is the Funktion One F121 price?

This listing offers Funktion One F121 subwoofers at €4,000 per pair at musicconcertevent.com. Three pairs are available with sequential serial numbers and original fully working components.

How does the Funktion One F121 compare to the F118 and F218?

The F118 is a single 18-inch subwoofer offering lower output than the F121. The F218 is a dual 18-inch format that covers similar output levels to the F121 through a different driver configuration. The F121 uses a single 21-inch driver for deep low-frequency extension. The right choice depends on your system requirements and transport capacity.

What is the Funktion-One F1201?

The Funktion-One F1201 is a larger format subwoofer from the F Series above the F121. Details not provided in this listing beyond the reference context. Refer to Funktion One’s official documentation for full F1201 specifications.

What does sequential serial numbers mean for a speaker system?

Sequential serial numbers confirm the units were built together and came from the same original system. They indicate matched operating history, consistent component ageing, and better acoustic matching across the set compared to units sourced from different systems.

How does the Res4E compare to the Funktion One Res 5?

The Funktion One Res 5 is a larger, higher-output speaker in the Resolution series suited for bigger stages and higher-demand applications. The Res4E is suited for mid-size professional applications including club main PA, festival support stages, and mid-capacity touring. The right choice depends on your target venue size and SPL requirements.

Can I buy the Res4E and F121 as a complete system?

Yes. Contact musicconcertevent.com directly for a combined price on all six Res4E and six F121 units as a complete matched system.

Where can I buy Funktion One speakers used in the USA?

musicconcertevent.com ships worldwide including to all USA destinations. This listing covers six Res4E and six F121 units with sequential numbers and confirmed working components. Estimated USA delivery is 7 to 14 business days.

Do you accept local pickup?

Local pickup is not available for individual or paired unit sales. It is available only for truckload purchases, by arrangement. All standard orders are sold and shipped online only. Contact us if you are purchasing the full twelve-unit system to discuss truckload logistics.

What amplifier do I need for the Funktion One Res4E and F121?

Details not provided in this listing. Refer to the official Funktion One technical documentation for the Res4E and F121 for recommended amplifier power handling and impedance requirements. Properly matched amplification is essential for these speakers to perform as designed.

---

Legal notice: All equipment is sold in used condition. Condition descriptions are based on seller verification at time of listing. musicconcertevent.com is not the original manufacturer of any listed equipment. Sequential serial number confirmation is as stated by the seller. Buyers are responsible for confirming technical compatibility with their existing systems before purchase. No manufacturer warranty is implied or stated unless confirmed separately in writing.